Turbo Iroc - Round Four (Edit: Staying Gen1, new PT7675, heads, intake)
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Turbo Iroc - Round Four (Edit: Staying Gen1, new PT7675, heads, intake)
The decision has been reached. While I'd love to mod the GT-R or build the 49, the Iroc is the best platform to hack up now that I don't care about it the way I did. I mean I'm no longer worried about ruining its stock appeal (not sure there really is stock appeal to third gens). And most importantly, the Iroc cleans up nicely.
In theory, I already have a 5.3 and 4L80e. It just happens to belong to a friend who just bought a 392 Challenger. As such, he's lost motivation and money to do the LS swap to his 79 TA. He is interested in the 49's engine and trans and some cash to trade for the 5.3 since he can just bolt it in and go. Maybe interested that is.
So the tentative plan is as follows:
1> Get my shop built (I already have the kit for the pole barn)
2> Put Iroc turbo engine in 49 (still might just stick a LS in it though)
3> Do Iroc build
The 49 would be a great ride with the Iroc setup in it with about 12 psi + 700r4. Already has an 8.5 10 bolt so that will hold up fine. I would use cast manifolds and twins on it though. Iroc headers anyone?
Iroc will get tubular K member with LS mounts (thinking BMR), major brake upgrades, lighter wheels eventually. Engine will be stockish 5.3, cam, LS style intake. Fuel system should be set already. Trans 4L80e and a 9 inch. 7876 single or twins? That is the question. Leaning towards twins.
Initial goal 650 rwhp. Beyond that will probably require more engine.
Hoping to have the shop finished with a lift by end of the year. The 49 engine swap by Spring. By the time that is running I would expect to have the K Member and 5.3 already mounted with the beginnings of wiring/plumbing started. All of this depends on money though, and some variables have recently entered the game. I'm basically building with an eye towards keeping costs lowest (hence not doing anything with the GT-R) and leaving open the option of selling the 49 if the variables cycle downward (quite possible due to economy affecting clients).
Let the project begin!
In theory, I already have a 5.3 and 4L80e. It just happens to belong to a friend who just bought a 392 Challenger. As such, he's lost motivation and money to do the LS swap to his 79 TA. He is interested in the 49's engine and trans and some cash to trade for the 5.3 since he can just bolt it in and go. Maybe interested that is.
So the tentative plan is as follows:
1> Get my shop built (I already have the kit for the pole barn)
2> Put Iroc turbo engine in 49 (still might just stick a LS in it though)
3> Do Iroc build
The 49 would be a great ride with the Iroc setup in it with about 12 psi + 700r4. Already has an 8.5 10 bolt so that will hold up fine. I would use cast manifolds and twins on it though. Iroc headers anyone?
Iroc will get tubular K member with LS mounts (thinking BMR), major brake upgrades, lighter wheels eventually. Engine will be stockish 5.3, cam, LS style intake. Fuel system should be set already. Trans 4L80e and a 9 inch. 7876 single or twins? That is the question. Leaning towards twins.
Initial goal 650 rwhp. Beyond that will probably require more engine.
Hoping to have the shop finished with a lift by end of the year. The 49 engine swap by Spring. By the time that is running I would expect to have the K Member and 5.3 already mounted with the beginnings of wiring/plumbing started. All of this depends on money though, and some variables have recently entered the game. I'm basically building with an eye towards keeping costs lowest (hence not doing anything with the GT-R) and leaving open the option of selling the 49 if the variables cycle downward (quite possible due to economy affecting clients).
Let the project begin!
Last edited by ZZ3Astro; 06-20-2016 at 09:14 AM.
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
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Re: Turbo Iroc - Round Four - 5.3 project!
if u dont care about the stock apearing aspect anymore , why not just toss the tpi and and get a single plane or hsr and pick up a ton of power just from that
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Re: Turbo Iroc - Round Four - 5.3 project!
Project... because I want to do an LS. I want coil per cylinder and short plug wires instead of long wires running alongside red hot headers... and about 300 other reasons.
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Re: Turbo Iroc - Round Four - 5.3 project!
Originally Posted by ZZ3Astro
The decision has been reached. While I'd love to mod the GT-R or build the 49, the Iroc is the best platform to hack up now that I don't care about it the way I did. I mean I'm no longer worried about ruining its stock appeal (not sure there really is stock appeal to third gens). And most importantly, the Iroc cleans up nicely...
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Re: Turbo Iroc - Round Four - 5.3 project!
Well, not a fan of the LS swap, but 4L80e + 9" + turbo will keep me here ;-)
I kind of actually hope that these things don't really go up in value. I like to tinker with something that I'm not really worried about at all, I get stressed enough about the things I build for it.... My other project is a '71 Mach 1 (an original 4bbl/track pack car from Arizona) and I'm not thrilled knowing that most things that I change on that car hurt it's value, but since I actually bought it for less than my 3rd gen with
I kind of actually hope that these things don't really go up in value. I like to tinker with something that I'm not really worried about at all, I get stressed enough about the things I build for it.... My other project is a '71 Mach 1 (an original 4bbl/track pack car from Arizona) and I'm not thrilled knowing that most things that I change on that car hurt it's value, but since I actually bought it for less than my 3rd gen with
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Car: '88 Formula, '94 Corvette, '95 Bird
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Re: Turbo Iroc - Round Four - 5.3 project!
What are the 300 other reasons?
I like the LS platform, well specifically the 6.0's as take out motors. I don't think I'd want to spend the money building one up though.
-- Joe
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: Turbo Iroc - Round Four - 5.3 project!
As discussed thoroughly in my previous thread, it is a matter of economics and I'm also tired of going against the grain. I want to become familiar with LS. I don't want to stay 30 years in the past. I want sequential injection. High flowing heads. High flowing intake. Larger throttle body. HIGH FLOWING cast manifolds to convert to turbo manifolds. Cheap replacements to the above when destruction occurs. None of this is possible on a Gen1 without a huge cash outlay. A sequential and CPS capable ECM swap alone would eat up a large chunk of the budget needed to do a 5.3 swap. Plus I need an engine for my 49 that makes more power and I'd rather make the Iroc the race car.
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Re: Turbo Iroc - Round Four - 5.3 project!
If you do it right you wont have to replace motors.
Just get a strong rod ls motor. Later model gen iv stuff. Early 5.3's bend rods at 600-700 hp. Gen iv rods do 800+
Stay small on cam and not to aggressive. Use good quality valve springs. I would do rering with proper gaps. Freshen up motor bearings. It will last forever with good tune
Just get a strong rod ls motor. Later model gen iv stuff. Early 5.3's bend rods at 600-700 hp. Gen iv rods do 800+
Stay small on cam and not to aggressive. Use good quality valve springs. I would do rering with proper gaps. Freshen up motor bearings. It will last forever with good tune
#11
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Re: Turbo Iroc - Round Four - 5.3 project!
Can't really fault Steve for wanting to go LSX, as I too want to get back into that part of the game, I miss it. I miss my old' 98 LS1 Trans AM, and my old '07 ZO6, had a lot of fun with them. I'd like to get my hands on another C6 ZO6 and slap on an F1X Procharger this time around though, tired of the turbo issues that always spring up on a daily driver, and they do, most just won't admit it... well, those that drive them hard like I do, that is.
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: Turbo Iroc - Round Four - 5.3 project!
As discussed thoroughly in my previous thread, it is a matter of economics and I'm also tired of going against the grain. I want to become familiar with LS. I don't want to stay 30 years in the past. I want sequential injection. High flowing heads. High flowing intake. Larger throttle body. HIGH FLOWING cast manifolds to convert to turbo manifolds. Cheap replacements to the above when destruction occurs. None of this is possible on a Gen1 without a huge cash outlay. A sequential and CPS capable ECM swap alone would eat up a large chunk of the budget needed to do a 5.3 swap. Plus I need an engine for my 49 that makes more power and I'd rather make the Iroc the race car.
Anyway, it's your car and do it as you please.
I'm just saying for future members searching this thread, I don't want them to think they have to go LSx to get any of the above mentioned features. You have been going against the grain for quite some time now. I've been following your build closely, and have noted every obstacle and problem you've encountered. A lot of the problems you've encountered have been directly tied to decisions you made along the way. It's gotten to the point where everyone is simply waiting to see what else can go wrong in your build.
-- Joe
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Car: '88 Formula, '94 Corvette, '95 Bird
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Transmission: T5, Zf6, 4L60E
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Re: Turbo Iroc - Round Four - 5.3 project!
It doesn't help that the thirdgen engine bay doesn't have a lot of room.
However, I don't know that I'd call a procharger an upgrade. I had a procharger for a year. What an epic POS. They run hot, they have crap efficiency, the whole mounting and belt tensioning system is a joke.
Vortech FTW.
-- Joe
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Re: Turbo Iroc - Round Four - 5.3 project!
Originally Posted by anesthes
I've always been a blower guy. I've had OEM turbo vehicles, and of course the firebird. The fabrication, heat, etc on the turbo is a PITA.
It doesn't help that the thirdgen engine bay doesn't have a lot of room.
However, I don't know that I'd call a procharger an upgrade. I had a procharger for a year. What an epic POS. They run hot, they have crap efficiency, the whole mounting and belt tensioning system is a joke.
Vortech FTW.
-- Joe
It doesn't help that the thirdgen engine bay doesn't have a lot of room.
However, I don't know that I'd call a procharger an upgrade. I had a procharger for a year. What an epic POS. They run hot, they have crap efficiency, the whole mounting and belt tensioning system is a joke.
Vortech FTW.
-- Joe
Sorry for the hijack Steve.
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Re: Turbo Iroc - Round Four - 5.3 project!
You already have a sequential CPS capable ECM.
Anyway, it's your car and do it as you please.
I'm just saying for future members searching this thread, I don't want them to think they have to go LSx to get any of the above mentioned features. You have been going against the grain for quite some time now. I've been following your build closely, and have noted every obstacle and problem you've encountered. A lot of the problems you've encountered have been directly tied to decisions you made along the way. It's gotten to the point where everyone is simply waiting to see what else can go wrong in your build.
-- Joe
Anyway, it's your car and do it as you please.
I'm just saying for future members searching this thread, I don't want them to think they have to go LSx to get any of the above mentioned features. You have been going against the grain for quite some time now. I've been following your build closely, and have noted every obstacle and problem you've encountered. A lot of the problems you've encountered have been directly tied to decisions you made along the way. It's gotten to the point where everyone is simply waiting to see what else can go wrong in your build.
-- Joe
Ouch. Wow.
I think I'll keep my build updates on Youtube then.
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Re: Turbo Iroc - Round Four - 5.3 project!
Nobody said anything about him not contributing. It's just always the end of the world with his build. He's been given advice on a number of things that would have made it easier for him. He sticks to his guns and does it his way. Then more crying about problems.
He has developed reasons why he wants to ditch the SBC and go 5.3, and I simply wanted to point out to others that those reasons are not quite true. We are a tech forum, and posting bad tech should be questioned.
You are not in a position to gauge other members or their contributions to the forum. You've vocalized a number of times now that you are unhappy with the forum, the posting, and the way it's run. Perhaps you shouldn't visit any longer? If we can't make you happy, I'm sure you will find a more welcoming place on the internet.
-- Joe
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Re: Turbo Iroc - Round Four - 5.3 project!
#21
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Re: Turbo Iroc - Round Four - 5.3 project!
Originally Posted by ZZ3Astro
Ouch. Wow.
I think I'll keep my build updates on Youtube then.
I think I'll keep my build updates on Youtube then.
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Re: Turbo Iroc - Round Four - 5.3 project!
I have enjoyed Steve build a ton. I think he's by far the most mechanically inclined IT guy I've seen. I look foward to whatever he does with the car, even if it is an ls. Everyone sees things differently from one another, so you have to set on your own path and follow it..... which Steve does. That, or he's just hard headed on some things, which I am guilty of as well.
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Re: Turbo Iroc - Round Four - 5.3 project!
I'm interested in your build as I'm in the process of doing a 5.3L twin turbo. Can't let people get to you... it's a public forum and when u post it's like u automatically sign a waiver saying u could get responses that are unwarranted. I personally look at it like for all the haters and people not appreciative there is at least 1 guy who's benefited or learned something from your posts.
Alot of people shunned me when I was putting a 521 BBF in my 87 firebird but now they love it... haters gona hate!
Alot of people shunned me when I was putting a 521 BBF in my 87 firebird but now they love it... haters gona hate!
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Re: Turbo Iroc - Round Four - 5.3 project!
Originally Posted by customblackbird
... it's a public forum and when u post it's like u automatically sign a waiver saying u could get responses that are unwarranted.
Originally Posted by customblackbird
Alot of people shunned me when I was putting a 521 BBF in my 87 firebird but now they love it... haters gona hate!
#26
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Re: Turbo Iroc - Round Four - 5.3 project!
FORMER contributor. I'm cleaning up my old contributions. I tried to post the build like I do my videos. REAL LIFE. Real thoughts and feelings. Most importantly I post the fails along with the wins. Apparently that gets an audience anxiously waiting to see my next screw-up. When I contribute here, thirdgen.org gets paid. When I contribute to Youtube, I get a check. I think I'll limit myself to Youtube moving forward. At least I get paid even when I'm getting negged.
I do appreciate the help and opinions everyone has given over the years. Some may call me stubborn but this project was to extract the most I could from TPI and factory plus. I exceeded my 500 rwhp goal by almost 10%. I got within 2 mph of my 1/8 goal. The car would have gotten a 9" (I never expected it to survive with a 9 bolt as long as it did) with the TPI combo but it just never did a mph worthy of spending more. And I'll go back to my reasoning for the very first turbo TPI post. My friend built a stock intake, flat tappet, mild head (world product) 350 nearly identical to my build and went 112 mph in the 1/8 in an 89 Vette. And TurboedTPI ran high 10's on a nearly identical setup with a much simpler fuel system in his Firebird.
At the end of the day I am an awesome builder and tuner regardless of the detractors around here. I've never thrown a rod, spun a bearing or even hurt my transmission build (unless you count the spring retainer plate taken out by the shock of breaking the 9 bolt). And when my head gasket went, my friend took it for a spin and didn't realize the boost was much higher at that time with the dump pipe open. No engine can take 20+ psi and lean out for long. That's more than a number of posters in here can claim.
I do appreciate the help and opinions everyone has given over the years. Some may call me stubborn but this project was to extract the most I could from TPI and factory plus. I exceeded my 500 rwhp goal by almost 10%. I got within 2 mph of my 1/8 goal. The car would have gotten a 9" (I never expected it to survive with a 9 bolt as long as it did) with the TPI combo but it just never did a mph worthy of spending more. And I'll go back to my reasoning for the very first turbo TPI post. My friend built a stock intake, flat tappet, mild head (world product) 350 nearly identical to my build and went 112 mph in the 1/8 in an 89 Vette. And TurboedTPI ran high 10's on a nearly identical setup with a much simpler fuel system in his Firebird.
At the end of the day I am an awesome builder and tuner regardless of the detractors around here. I've never thrown a rod, spun a bearing or even hurt my transmission build (unless you count the spring retainer plate taken out by the shock of breaking the 9 bolt). And when my head gasket went, my friend took it for a spin and didn't realize the boost was much higher at that time with the dump pipe open. No engine can take 20+ psi and lean out for long. That's more than a number of posters in here can claim.
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Re: Turbo Iroc - Round Four - 5.3 project!
Originally Posted by ZZ3Astro
When I contribute here, thirdgen.org gets paid. When I contribute to Youtube, I get a check. I think I'll limit myself to Youtube moving forward. At least I get paid even when I'm getting negged.
Originally Posted by ZZ3Astro
I do appreciate the help and opinions everyone has given over the years. Some may call me stubborn but this project was to extract the most I could from TPI and factory plus. I exceeded my 500 rwhp goal by almost 10%. I got within 2 mph of my 1/8 goal. The car would have gotten a 9" (I never expected it to survive with a 9 bolt as long as it did) with the TPI combo but it just never did a mph worthy of spending more. And I'll go back to my reasoning for the very first turbo TPI post. My friend built a stock intake, flat tappet, mild head (world product) 350 nearly identical to my build and went 112 mph in the 1/8 in an 89 Vette. And TurboedTPI ran high 10's on a nearly identical setup with a much simpler fuel system in his Firebird...
Originally Posted by ZZ3Astro
At the end of the day I am an awesome builder and tuner...
#28
Re: Turbo Iroc - Round Four - 5.3 project!
FORMER contributor. I'm cleaning up my old contributions. I tried to post the build like I do my videos. REAL LIFE. Real thoughts and feelings. Most importantly I post the fails along with the wins. Apparently that gets an audience anxiously waiting to see my next screw-up. When I contribute here, thirdgen.org gets paid. When I contribute to Youtube, I get a check. I think I'll limit myself to Youtube moving forward. At least I get paid even when I'm getting negged.
I do appreciate the help and opinions everyone has given over the years. Some may call me stubborn but this project was to extract the most I could from TPI and factory plus. I exceeded my 500 rwhp goal by almost 10%. I got within 2 mph of my 1/8 goal. The car would have gotten a 9" (I never expected it to survive with a 9 bolt as long as it did) with the TPI combo but it just never did a mph worthy of spending more. And I'll go back to my reasoning for the very first turbo TPI post. My friend built a stock intake, flat tappet, mild head (world product) 350 nearly identical to my build and went 112 mph in the 1/8 in an 89 Vette. And TurboedTPI ran high 10's on a nearly identical setup with a much simpler fuel system in his Firebird.
At the end of the day I am an awesome builder and tuner regardless of the detractors around here. I've never thrown a rod, spun a bearing or even hurt my transmission build (unless you count the spring retainer plate taken out by the shock of breaking the 9 bolt). And when my head gasket went, my friend took it for a spin and didn't realize the boost was much higher at that time with the dump pipe open. No engine can take 20+ psi and lean out for long. That's more than a number of posters in here can claim.
I do appreciate the help and opinions everyone has given over the years. Some may call me stubborn but this project was to extract the most I could from TPI and factory plus. I exceeded my 500 rwhp goal by almost 10%. I got within 2 mph of my 1/8 goal. The car would have gotten a 9" (I never expected it to survive with a 9 bolt as long as it did) with the TPI combo but it just never did a mph worthy of spending more. And I'll go back to my reasoning for the very first turbo TPI post. My friend built a stock intake, flat tappet, mild head (world product) 350 nearly identical to my build and went 112 mph in the 1/8 in an 89 Vette. And TurboedTPI ran high 10's on a nearly identical setup with a much simpler fuel system in his Firebird.
At the end of the day I am an awesome builder and tuner regardless of the detractors around here. I've never thrown a rod, spun a bearing or even hurt my transmission build (unless you count the spring retainer plate taken out by the shock of breaking the 9 bolt). And when my head gasket went, my friend took it for a spin and didn't realize the boost was much higher at that time with the dump pipe open. No engine can take 20+ psi and lean out for long. That's more than a number of posters in here can claim.
While the philosophy you propose is a doubled edged sword (hopefully eliminating problem elements vs introducing uncertainty via the swap) I don't think your choice is off the mark. The reality is that the economics of an SBC are not what they used to be for a mid HP street engine, and a third gen powertrain is flawed at its power levels. The minute you have to start building one up it kinda sucks because most production LS parts from the block in will cope with power better than a similar SBC component. Even if these ideas don't hold true, if it makes your car fun for you again then it was worth it.
PS:subbed to your channel. Hope to see some good things coming our way!
#30
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Re: Turbo Iroc - Round Four - 5.3 project!
I'm just going to cool off for a while.
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Re: Turbo Iroc - Round Four - 5.3 project!
I hope to see yiu continuing a thread here. Dont worry about all the remarks about going LS. It amazes me how many SBC guys get their panties in a bundle over an LS swap. It not like you are swapping in a 5.0L. Bang for buck you cannot beat it plus there is so much info out there on it.
Its a shame that most people on this board cannot appreciate a nicely done turbo LS. Most seem to only care about cobbled together SBC setups that a terribly mismatched and barely see the road.
Ill be sure to follow youtube!
Jay
Its a shame that most people on this board cannot appreciate a nicely done turbo LS. Most seem to only care about cobbled together SBC setups that a terribly mismatched and barely see the road.
Ill be sure to follow youtube!
Jay
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Re: Turbo Iroc - Round Four - 5.3 project!
I hope to see yiu continuing a thread here. Dont worry about all the remarks about going LS. It amazes me how many SBC guys get their panties in a bundle over an LS swap. It not like you are swapping in a 5.0L. Bang for buck you cannot beat it plus there is so much info out there on it.
Nobody has their panties in a bunch over the LS. The LS is a far superior engine.
I simply pointed out he was wrong on a number of his 'reasons'. He said he wanted sequential injection. That has nothing to do with the LS engine, and he currently has a Megasquirt capable of sequential injection.
He said he wanted high flowing heads. Stock 5.3 heads flow slightly better than vortec heads, and nowhere near what my AFR 210 heads flow. You don't need an LS platform for high flowing heads.
He said "Big throttle body". I ran a 95 MM LS2 throttle body for two years on my SBC when I ran the singleplane intake with the elbow. His choice to stick with the TPI setup is why his intake flows so terribly. You don't need an LS to fix that.
Then the "High flow cast manifolds". I used LT1 manifolds on my turbo build. They had enough material to port to a 1406 to match the AFR210 heads. They flow quite well, and probably comperable to a 6.0 truck manifold.
I had ZERO concern about him wanting to go LS. In fact, I think it's pretty cool. I had an issue with posting opinion not backed by fact. He got upset because I told him a lot of his problems are due to HIS decisions. A LOT of people chimed in his threads thought out ALL of his issues. Every other week him talking about getting rid of the car, etc. Frankly, I'm shocked at how he took my critique, and his behavior afterwards.
I never intended to hurt his feelings.
-- Joe
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Re: Turbo Iroc - Round Four - 5.3 project!
I know hes sick of the sbc, but the potential was already there without swapping to an ls. As it sits, a different intake and th400 would put it solidly in the 6's. Add a 12 bolt and tbrake and it would go mid 6's.
A 600+ hp 5.3 is going to need a different trans and rearend too. But, I can still understand him on how sick he is of this setup. Not knocking him for swapping at all.
A 600+ hp 5.3 is going to need a different trans and rearend too. But, I can still understand him on how sick he is of this setup. Not knocking him for swapping at all.
#34
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Car: 1987 Iroc Vert
Engine: 305
Transmission: 5 spd
Re: Turbo Iroc - Round Four - 5.3 project!
I am very much a new bee to putting a Turbo on anything and have been bitten by the bug to put one on my 87. I've been reading ton's of posts, but find your threads VERY easy to understand and follow especially your u tube video's, like the one called " what you need to Turbo a TPI350", which I found here. From Turbo Iroc 1(I would like to reference in the future and hopefully will be replaced) and now turbo Iroc (4), I feel like they read like a book with follow up information and I RESPECT the fact that you kept it bone stock with great results. my
I hope you change your mind and would very much like to follow this build.
I hope you change your mind and would very much like to follow this build.
#35
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: Turbo Iroc - Round Four - 5.3 project!
I also want to clarify another component of my reasoning for LS vs Gen1. I'm not at all excited about dealing with converting accessories over etc... but I'd really need to go back into the shortblock as well if I stayed gen1. It just has stock PM rods in it and a 1053 crank. It was never intended to go much over 5000 rpm or make even as much horsepower as it is making now. A failure would be very costly to repair. With the 5.3 it would just be another $450 engine and some head gaskets, not to mention the stock LS hardware is proven in both higher rpm and more horsepower. I could go on and on with reasons. Just know that this is not some thing I want to go with on a whim.
#36
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: Turbo Iroc - Round Four - 5.3 project!
Ok I'm over it. I will post updates here.
Build plan is as follows:
5.3 - not sure on heads/intake but something like LS3 intake with good factory heads. Cam whatever the best 5.3 cam for a turbo setup seems to be (haven't researched yet).
TH400 - trying to stay on a budget, and I can always go 4L80e later if the mood strikes. Possible upgrade to better 1st gear ratio. Transbrake.
9" rear from Quick. After discussing with Orr, I believe the 31 spline axles are sufficient for my short term plans and much cheaper than the 35 route. Whole rear with good locker and aluminum center section less than $2700 delivered. Guessing 3.0 to 3.25 ratio.
AC - forget about it for now
BMR K member with LS mounts. Looking around this one seems to have the fewest complaints vs Spohn etc.
4th gen brakes on rear. Front maybe after market. I want it to stop and I expect it to turn a good number in the 1/4 and 1/2 mile so it needs decent brakes.
Fuel supply - a real fuel pump. No more games.
Goal is high 9 second quarter and low 6 second eighth. Wheels up launch.
My pole barn goes up in about two weeks and I expect to have it walled in and a lift in place by late winter. Nothing much happens before the walls. Lift not required to get started but hopefully I will have it sooner than later.
Anesthes - No hard feelings. I will take the blame on this situation. I'm dealing with a medical issue right now that has put me in a state of fatigue and constant joint pain. It just didn't mix well with your comments on a project that has been a pain in my butt for a long while. At least my Dr now knows what is going on so I can maybe finally get back to some normality soon.
Build plan is as follows:
5.3 - not sure on heads/intake but something like LS3 intake with good factory heads. Cam whatever the best 5.3 cam for a turbo setup seems to be (haven't researched yet).
TH400 - trying to stay on a budget, and I can always go 4L80e later if the mood strikes. Possible upgrade to better 1st gear ratio. Transbrake.
9" rear from Quick. After discussing with Orr, I believe the 31 spline axles are sufficient for my short term plans and much cheaper than the 35 route. Whole rear with good locker and aluminum center section less than $2700 delivered. Guessing 3.0 to 3.25 ratio.
AC - forget about it for now
BMR K member with LS mounts. Looking around this one seems to have the fewest complaints vs Spohn etc.
4th gen brakes on rear. Front maybe after market. I want it to stop and I expect it to turn a good number in the 1/4 and 1/2 mile so it needs decent brakes.
Fuel supply - a real fuel pump. No more games.
Goal is high 9 second quarter and low 6 second eighth. Wheels up launch.
My pole barn goes up in about two weeks and I expect to have it walled in and a lift in place by late winter. Nothing much happens before the walls. Lift not required to get started but hopefully I will have it sooner than later.
Anesthes - No hard feelings. I will take the blame on this situation. I'm dealing with a medical issue right now that has put me in a state of fatigue and constant joint pain. It just didn't mix well with your comments on a project that has been a pain in my butt for a long while. At least my Dr now knows what is going on so I can maybe finally get back to some normality soon.
#37
Re: Turbo Iroc - Round Four - 5.3 project!
You should just do c5 or c6 brakes up front. it'll keep it simple and can be done for around 500 bucks with just a little bit of work.
Ive been lurking on the site for a couple years and finally made a account. Ive got my ls engines, and figured id try and do something cool with the tbi bird i picked up.
Ill be following your builds
Ive been lurking on the site for a couple years and finally made a account. Ive got my ls engines, and figured id try and do something cool with the tbi bird i picked up.
Ill be following your builds
#39
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Car: 92 Formula 350
Engine: L98 with a T-76
Transmission: ArtCarr 700-R4
Axle/Gears: Bone stock 10bolt and 3.23's
Re: Turbo Iroc - Round Four - 5.3 project!
Glad you decided to stay on here steve. Ill be following your build. Good luck man.
#40
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Car: '88 Iroc
Engine: Single turbo Vortec 5.7, Megasquirt
Transmission: Probuilt 700r4 3000 stall Vigilante
Axle/Gears: Moser 9" 3.25 w/True Trac
Re: Turbo Iroc - Round Four - 5.3 project!
Steve, your build threads helped me out a lot especially when I was first getting my feet wet into the the turbo world. I'd love to see your car pulling the wheels with a transbrake launch! I got a huge kick out of your Hitler videos about the Iroc. Those were great.
One more opinion on the brake upgrade. My experience with the LS1 rears is that they are not very aggressive even with full line pressure (matching the front) and aggressive pads and I don't really know if I gained any stopping power. If I would do it again, I would go with drums that allowed the use of any 15" wheel. I leave my proportioning valve wide open and the rears don't have nearly the power to lock up the rear tires. Maybe it's just my car. Who knows.
The LS1 fronts on the other hand, are one of the best upgrades I've ever done - bang for the buck. 16" wheels are as small as you can go, but in this case it's totally worth it in my opinion.
Subscribed.
One more opinion on the brake upgrade. My experience with the LS1 rears is that they are not very aggressive even with full line pressure (matching the front) and aggressive pads and I don't really know if I gained any stopping power. If I would do it again, I would go with drums that allowed the use of any 15" wheel. I leave my proportioning valve wide open and the rears don't have nearly the power to lock up the rear tires. Maybe it's just my car. Who knows.
The LS1 fronts on the other hand, are one of the best upgrades I've ever done - bang for the buck. 16" wheels are as small as you can go, but in this case it's totally worth it in my opinion.
Subscribed.
#41
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Re: Turbo Iroc - Round Four - 5.3 project!
Steve, your build threads helped me out a lot especially when I was first getting my feet wet into the the turbo world. I'd love to see your car pulling the wheels with a transbrake launch! I got a huge kick out of your Hitler videos about the Iroc. Those were great.
One more opinion on the brake upgrade. My experience with the LS1 rears is that they are not very aggressive even with full line pressure (matching the front) and aggressive pads and I don't really know if I gained any stopping power. If I would do it again, I would go with drums that allowed the use of any 15" wheel. I leave my proportioning valve wide open and the rears don't have nearly the power to lock up the rear tires. Maybe it's just my car. Who knows.
The LS1 fronts on the other hand, are one of the best upgrades I've ever done - bang for the buck. 16" wheels are as small as you can go, but in this case it's totally worth it in my opinion.
Subscribed.
One more opinion on the brake upgrade. My experience with the LS1 rears is that they are not very aggressive even with full line pressure (matching the front) and aggressive pads and I don't really know if I gained any stopping power. If I would do it again, I would go with drums that allowed the use of any 15" wheel. I leave my proportioning valve wide open and the rears don't have nearly the power to lock up the rear tires. Maybe it's just my car. Who knows.
The LS1 fronts on the other hand, are one of the best upgrades I've ever done - bang for the buck. 16" wheels are as small as you can go, but in this case it's totally worth it in my opinion.
Subscribed.
#42
Re: Turbo Iroc - Round Four - 5.3 project!
Ok I'm over it. I will post updates here.
Build plan is as follows:
5.3 - not sure on heads/intake but something like LS3 intake with good factory heads. Cam whatever the best 5.3 cam for a turbo setup seems to be (haven't researched yet).
TH400 - trying to stay on a budget, and I can always go 4L80e later if the mood strikes. Possible upgrade to better 1st gear ratio. Transbrake.
9" rear from Quick. After discussing with Orr, I believe the 31 spline axles are sufficient for my short term plans and much cheaper than the 35 route. Whole rear with good locker and aluminum center section less than $2700 delivered. Guessing 3.0 to 3.25 ratio.
AC - forget about it for now
BMR K member with LS mounts. Looking around this one seems to have the fewest complaints vs Spohn etc.
4th gen brakes on rear. Front maybe after market. I want it to stop and I expect it to turn a good number in the 1/4 and 1/2 mile so it needs decent brakes.
Fuel supply - a real fuel pump. No more games.
Goal is high 9 second quarter and low 6 second eighth. Wheels up launch.
Build plan is as follows:
5.3 - not sure on heads/intake but something like LS3 intake with good factory heads. Cam whatever the best 5.3 cam for a turbo setup seems to be (haven't researched yet).
TH400 - trying to stay on a budget, and I can always go 4L80e later if the mood strikes. Possible upgrade to better 1st gear ratio. Transbrake.
9" rear from Quick. After discussing with Orr, I believe the 31 spline axles are sufficient for my short term plans and much cheaper than the 35 route. Whole rear with good locker and aluminum center section less than $2700 delivered. Guessing 3.0 to 3.25 ratio.
AC - forget about it for now
BMR K member with LS mounts. Looking around this one seems to have the fewest complaints vs Spohn etc.
4th gen brakes on rear. Front maybe after market. I want it to stop and I expect it to turn a good number in the 1/4 and 1/2 mile so it needs decent brakes.
Fuel supply - a real fuel pump. No more games.
Goal is high 9 second quarter and low 6 second eighth. Wheels up launch.
I'd skip the first gear upgrade on a 400 and go straight to an 80E at that point. You're in almost a grand on doing it and I suspect not gaining a lot. Get a basic rebuild on the 400 and you should be fine for the power levels you want or get an 80E because you don't have the TCU expense if you're using HPT with a factory ECU.
#43
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Re: Turbo Iroc - Round Four - 5.3 project!
Will be following this closely, glad you stayed! Gona need some ideas with everything so we should be very close in builds. I just started my single turbo 5.3 as well. Literally just dropped the motor in yesterday. Im going cheap, 1999 stock 5.3, didnt remove the heads, or intake or accessories. Pulled the pan and swapped to a Fbody with windage tray and pickup. Swapped stock valve springs for LS6, leaving stock everything else. I got some 60lb (at 43psi) bosch LS1 injectors and harness adapters from FIC (they are 72lb at 58psi) and was told they would support 800hp at 85% DC. I depinned the OEM 1999 LS ECM/harness and going to be running HPT with 2bar SD operating system. Got cheap ebay forward/up SS turbo headers and they fit pretty well. Im going to put a GT45 on it on the pass side and let it eat. 8-10psi and 550-600hp should be expected.
The truck intake will NOT fit with the stock hood. While the back sits below the cowl line the front is up kinda high. Mostly the height of the alternator with the truck accessories But I believe the TB/front of the truck intake would contact a stock hood.
Be sure you verified that its a 5.3 and not a 4.8L. They are the same block and unless you pulled the motor yourself and verified the VIN/RPO codes I would pull the pan and look at the rods, if its a 5.3L then it should have 143 casted into the rod by the rod bolts. If its a different number (forget what) then its a 4.8L. I verified mine when I put the Fbody oil pan. For what its worth the Fbody oil pan is required and so is the Fbody windage tray and pickup. Its not worth cutting the stock truck tray up as the Fbody tray new is like $13. I picked mine up from summit and had them price match it to $198 for the pan. Pickup, windage tray, oil dipstick and tube was like $60 as well. So $260 for all new GM performance parts oil pan swap vs the $370 holley one and holley's didnt even come with a pan gasket which is like $35!
The truck intake will NOT fit with the stock hood. While the back sits below the cowl line the front is up kinda high. Mostly the height of the alternator with the truck accessories But I believe the TB/front of the truck intake would contact a stock hood.
Be sure you verified that its a 5.3 and not a 4.8L. They are the same block and unless you pulled the motor yourself and verified the VIN/RPO codes I would pull the pan and look at the rods, if its a 5.3L then it should have 143 casted into the rod by the rod bolts. If its a different number (forget what) then its a 4.8L. I verified mine when I put the Fbody oil pan. For what its worth the Fbody oil pan is required and so is the Fbody windage tray and pickup. Its not worth cutting the stock truck tray up as the Fbody tray new is like $13. I picked mine up from summit and had them price match it to $198 for the pan. Pickup, windage tray, oil dipstick and tube was like $60 as well. So $260 for all new GM performance parts oil pan swap vs the $370 holley one and holley's didnt even come with a pan gasket which is like $35!
#44
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Join Date: Jul 1999
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: Turbo Iroc - Round Four - 5.3 project!
A small update.. not much going to happen for a bit on this one. First I have to get my shop finished and a lift. The good news is that the pole barn just got finished and I'm working on getting the walls planned out. Once we have that I will get the concrete done with the wall anchors in place, then it is just a matter of funding. Once the shop is done, I'm going to get the 49 running with the Iroc engine and 700r4. I'm buying Diggler's STR manifolds and twin 57mm turbos for that.
One thing I might do though is go ahead and start on the Iroc engine removal in the next couple of weeks (assuming I get the concrete down, so I can keep the 49 in the pole barn). I want to take a look at the Iroc's installed position of the camshaft. That has been bothering me for a while and I want to verify position. I'm probably going to swap in a bigger cam for the 49, mainly because I want a bit more lope to the idle as the 49 doesn't need optimum power - it needs sound!!
Finally, I have some good news! I found the 67mm Precision. It was in the right box and I'm not sure how I missed it so many times. Either way, it's in my hands. Now the thought it crossing my mind.. What if.. What if I ran TWO of those 67s on the 5.3? Eventually I would probably go forged 6.0 anyway, but even a stock 5.3 how been known to survive 1000 and those two turbos will support 1200 hp together. So that is something to consider vs running the single 7876.
One thing I might do though is go ahead and start on the Iroc engine removal in the next couple of weeks (assuming I get the concrete down, so I can keep the 49 in the pole barn). I want to take a look at the Iroc's installed position of the camshaft. That has been bothering me for a while and I want to verify position. I'm probably going to swap in a bigger cam for the 49, mainly because I want a bit more lope to the idle as the 49 doesn't need optimum power - it needs sound!!
Finally, I have some good news! I found the 67mm Precision. It was in the right box and I'm not sure how I missed it so many times. Either way, it's in my hands. Now the thought it crossing my mind.. What if.. What if I ran TWO of those 67s on the 5.3? Eventually I would probably go forged 6.0 anyway, but even a stock 5.3 how been known to survive 1000 and those two turbos will support 1200 hp together. So that is something to consider vs running the single 7876.
#47
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: Turbo Iroc - Round Four - 5.3 project!
yaj - might as well keep it. It wasn't going to bring enough money so I figured might as well give the Iroc stupid power and leave the 49 more of a cruiser. They will each have a specific purpose instead of one trying to be a do-all car.
Diggler - My friend thinks two 6766's won't spool very good but I reminded him how much better one spools on the Iroc when every other turbo I've tried has been lack-luster. How much trouble did you have on the 6.0 with spooling? What kind of heads/intake did it take to get to that kind of power?
Diggler - My friend thinks two 6766's won't spool very good but I reminded him how much better one spools on the Iroc when every other turbo I've tried has been lack-luster. How much trouble did you have on the 6.0 with spooling? What kind of heads/intake did it take to get to that kind of power?
#48
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Re: Turbo Iroc - Round Four - 5.3 project!
i bought them from the guy, and i never personally ran them. but, his engine was a 408" with out of the box trickflow 225 heads. he said spool was super quick, and he typically left the line at 3000 rpms. th400/3.08 gear, and 275 radials. went 1.30 60's.
lookup the drag week lsx pinto.
lookup the drag week lsx pinto.
#49
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Re: Turbo Iroc - Round Four - 5.3 project!
What housing? .68-.81 ish ar will spool fine. Put a mild cam in it and dont be afraid of alittle stall speed and trans brake
I've seen 5.3-6.0's light on3 76mm comp ptrim 64mm turbines just fine
My low comp 401" lights up 7268's with .81 ar really quick on tbrake at 4200-4500 rpm! Lol
I've seen 5.3-6.0's light on3 76mm comp ptrim 64mm turbines just fine
My low comp 401" lights up 7268's with .81 ar really quick on tbrake at 4200-4500 rpm! Lol