How much boost for 9.1-1 cr?
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Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
How much boost for 9.1-1 cr?
Is there some kind of chart somewhere? I'd like to know a safe limit for turning the boost up.
My blower is a v-1 and is rated at 680hp, so I may max it out at 750 anyway with my planned 10lbs.
No intercooler, maybe in the future. Have a meth inj kit and boost timing controller. Iron heads and forged srp pistons.
My blower is a v-1 and is rated at 680hp, so I may max it out at 750 anyway with my planned 10lbs.
No intercooler, maybe in the future. Have a meth inj kit and boost timing controller. Iron heads and forged srp pistons.
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Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Re: How much boost for 9.1-1 cr?
I have one but it never seemed to work. Couldve been a bad knock sensor. It was a cheap led gauge off ebay. That could be at fault too.......
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Re: How much boost for 9.1-1 cr?
yeah it probly depends on the gas you use and the tune. 9:1 seems pretty good for boost, but with iron heads 9:1 aint bad for n/a motors either. if it was aluminum i'd say 9:1 is a good ratio to shoot for. it still should be good with 10 psi tho. i've seen alot of ppl running 7-10psi on stock motors like LT1's with 10.5 to 1 compression
my buddy ran 12 on his L98 before the bottom end blew L98's are 9.3 to 1
my buddy ran 12 on his L98 before the bottom end blew L98's are 9.3 to 1
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Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Re: How much boost for 9.1-1 cr?
Wow, thats a lot of stress on a stock crank. I'm surprised the pistons didnt shatter first.
I know that boost raises your compression, and there must be a known limit of some sort on forged parts, compression wise.
I think I'll max out this blower though, either cfm or rpms, before I max out the boost potential of my engine.
With the smallest pulley I have, I'm taking this blower to its rpm limit at around 6k rpms. That was about 15 psi on the 305. My 383 breathes much better, so the psi will be lower. Its also recommended with the carb that I have that I dont take it above 10 psi. Maybe the shaft seals wont hold up?
I know that boost raises your compression, and there must be a known limit of some sort on forged parts, compression wise.
I think I'll max out this blower though, either cfm or rpms, before I max out the boost potential of my engine.
With the smallest pulley I have, I'm taking this blower to its rpm limit at around 6k rpms. That was about 15 psi on the 305. My 383 breathes much better, so the psi will be lower. Its also recommended with the carb that I have that I dont take it above 10 psi. Maybe the shaft seals wont hold up?
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#8
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Re: How much boost for 9.1-1 cr?
www.turboforums.com
batass read on there different buildups. Also people have taken stock bottom end 350s to the low 9s with boost. It helps that you don't spin a boosted motor to the moon in most cases.
batass read on there different buildups. Also people have taken stock bottom end 350s to the low 9s with boost. It helps that you don't spin a boosted motor to the moon in most cases.
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: How much boost for 9.1-1 cr?
RPM is what hurts parts more so than pressure from forced induction. Forced induction just adds more heat which can seize rings and melt pistons (if it goes lean). Pistons and rods and crankshafts can stand LOADS of cylinder pressure at lower RPMs if the temps aren't too high. info care of Corky Bell. Very good chart about how crankshaft stress is related to RPM and boost - boost had a minimal effect.
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Re: How much boost for 9.1-1 cr?
www.turboforums.com
batass read on there different buildups. Also people have taken stock bottom end 350s to the low 9s with boost. It helps that you don't spin a boosted motor to the moon in most cases.
batass read on there different buildups. Also people have taken stock bottom end 350s to the low 9s with boost. It helps that you don't spin a boosted motor to the moon in most cases.
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Re: How much boost for 9.1-1 cr?
it's alright, although that forum much like this forum, when I have a question it often goes unanswered because no one knows
Luckily I'm pretty good at wasting hours that should be doing work on doing google searches for what I need to learn. That and my AEM wideband will help in tuning this spring
Luckily I'm pretty good at wasting hours that should be doing work on doing google searches for what I need to learn. That and my AEM wideband will help in tuning this spring
#14
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Re: How much boost for 9.1-1 cr?
it's alright, although that forum much like this forum, when I have a question it often goes unanswered because no one knows
Luckily I'm pretty good at wasting hours that should be doing work on doing google searches for what I need to learn. That and my AEM wideband will help in tuning this spring
Luckily I'm pretty good at wasting hours that should be doing work on doing google searches for what I need to learn. That and my AEM wideband will help in tuning this spring
I think I remember you picked up of GN turbos and I/C's, right?
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Re: How much boost for 9.1-1 cr?
still don't have the fmic, piping, or the bov. The fmic and bov I'm assuming will be shipped to me shortly, I already paid for them. The piping I'm up in the air about making my own out of exhaust piping or buying those ebay one size fits all kits and piecing it together that way with some fab time. Pics will be sometime before spring lol.
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Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: How much boost for 9.1-1 cr?
If you do with the universal IC mount kit post the wall thickness on the pipe. You get a lot of alum. for the price. I am wondering how thick it is.
I read the ebay single turbo headers had 1/8" wall pipe........I measured one a week ago and the wall was .050" (18 gauge) S/S.
I read the ebay single turbo headers had 1/8" wall pipe........I measured one a week ago and the wall was .050" (18 gauge) S/S.
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Re: How much boost for 9.1-1 cr?
If you do with the universal IC mount kit post the wall thickness on the pipe. You get a lot of alum. for the price. I am wondering how thick it is.
I read the ebay single turbo headers had 1/8" wall pipe........I measured one a week ago and the wall was .050" (18 gauge) S/S.
I read the ebay single turbo headers had 1/8" wall pipe........I measured one a week ago and the wall was .050" (18 gauge) S/S.
hehehe. I just can't wait to make my thread, 2 turbos + custom ground roller cam + 350....will I run 12.99 yet?
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Re: How much boost for 9.1-1 cr?
https://www.thirdgen.org/forums/tech...dius-seat.html
Only 14 views even.
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Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: How much boost for 9.1-1 cr?
I'll post the thickness if I decide to buy one of those kits, I know a few other people who have bought the kits, maybe I'll ask them to bust out the caliper and get a measurement. He got all his piping, t-bolt clamps and silicone ends and elbows that he needed for under 260 to his door. Extremely cheap IMO.
I was surprised when I looked at the ebay single header. I was like that could be 16 gauge. I put the calipers on it and saw it was 18 gauge. You can see why the headers crack near the welds. The thin S/S and brittle welds (blackish color) are a weak point. They run a quick TIG over the center of the weld to give it a small gold (good weld) appearance.
If you do measure the pipe, do the couplers too. I wonder if they are 3-ply. The T-bolt clamps look a little strange. Not like a truck or normal S/S strong T-bolt clamp. They look like they would get the job done though. If the pipe is thin then that is a good thing or the pipe would oval/crush.
----------
How about my seat cutter question?
https://www.thirdgen.org/forums/tech...dius-seat.html
Only 14 views even.
https://www.thirdgen.org/forums/tech...dius-seat.html
Only 14 views even.
Last edited by junkcltr; 01-02-2008 at 11:34 PM. Reason: Automerged Doublepost
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Engine: 3xx ci tubo
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Re: How much boost for 9.1-1 cr?
Probably have to put some good gas in it and sticky tires. I wouldn't go under a 14 flat. They make you put a helmet on and the booming bass out of the radio doesn't sound as good at the tree.
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Re: How much boost for 9.1-1 cr?
How about my seat cutter question?
https://www.thirdgen.org/forums/tech...dius-seat.html
Only 14 views even.
https://www.thirdgen.org/forums/tech...dius-seat.html
Only 14 views even.
#24
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Re: How much boost for 9.1-1 cr?
Yes, the walls are extremely thin on the AL tubing from ebay. I used some on the turbo Corssie I just finished because that's what the customer brought me. On the good side, it is extremely light and came with a black annodized finish (appeared to be 18ga).
I wouldn't trust the welds on there. Especially if it's 18ga. The headers on the Corssie were built with 14ga mandrels and welded along anywhere the primaries were remotely close. The y was made with 16ga and when installed we jumped up and down on it to make sure the turbo didn't need another support bracket (maybe wasn't the best test, *but*).
the only thing I really didn't like that I went with anyways was the fact that he brought some 18ga 2.5" mandrel u-bends that was intended for the I/C piping, but he didn't bring anything for the downpipe and it was made with it. Good thing he brought the AL tubing or the job wouldn't have gotten done in time for him to go home on Sat (started 12pm Th). The 2" pipe from the turbo to I/C was also made with the same material as the y, let's see how long it will last.
His tranny blew out on Sun while "playing with it a little" and the pipes are now getting coated, so we will see.
LOL junk.
Can't wait to get the meter for the flow bench. $500 is a lot of cash right now with the shape of the economy, but saving for it now. I'm building a FlowQuik setup on th loft at the shop, the rest of the materials is cheap or is already in the garage.
I wouldn't trust the welds on there. Especially if it's 18ga. The headers on the Corssie were built with 14ga mandrels and welded along anywhere the primaries were remotely close. The y was made with 16ga and when installed we jumped up and down on it to make sure the turbo didn't need another support bracket (maybe wasn't the best test, *but*).
the only thing I really didn't like that I went with anyways was the fact that he brought some 18ga 2.5" mandrel u-bends that was intended for the I/C piping, but he didn't bring anything for the downpipe and it was made with it. Good thing he brought the AL tubing or the job wouldn't have gotten done in time for him to go home on Sat (started 12pm Th). The 2" pipe from the turbo to I/C was also made with the same material as the y, let's see how long it will last.
His tranny blew out on Sun while "playing with it a little" and the pipes are now getting coated, so we will see.
I never visit the tech/general board..........make that 15 views and still no answer.
Can't wait to get the meter for the flow bench. $500 is a lot of cash right now with the shape of the economy, but saving for it now. I'm building a FlowQuik setup on th loft at the shop, the rest of the materials is cheap or is already in the garage.
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Re: How much boost for 9.1-1 cr?
I don't know anything about valve cutting. I know more angles are better but that is about it. I have read Vizard's valvetrain book probably 10 times. My last valve job cost $45 for a pair of V8 heads. It wasn't the prettiest job but it seems to work fine.
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Re: How much boost for 9.1-1 cr?
Here is some cross sections of a 3400 head (the one I had a question about)...
http://60degreev6.com/gallery/browse...es&c=11&page=5
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Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: How much boost for 9.1-1 cr?
I wouldn't trust the welds on there. Especially if it's 18ga. The headers on the Corssie were built with 14ga mandrels and welded along anywhere the primaries were remotely close. The y was made with 16ga and when installed we jumped up and down on it to make sure the turbo didn't need another support bracket (maybe wasn't the best test, *but*).
Was that both of you jumping on the header together? Trying to picture the balance/jumping coordination. On the count of 3....wait on 3 or after 3?
the only thing I really didn't like that I went with anyways was the fact that he brought some 18ga 2.5" mandrel u-bends that was intended for the I/C piping, but he didn't bring anything for the downpipe and it was made with it. Good thing he brought the AL tubing or the job wouldn't have gotten done in time for him to go home on Sat (started 12pm Th). The 2" pipe from the turbo to I/C was also made with the same material as the y, let's see how long it will last.
I once had the great idea of using a TPI V8 analog MAF to make a bench. Another project that was never done.
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Re: How much boost for 9.1-1 cr?
LOL
Ther was actually three of us, and it's funny - I thought for sure they were at least my age. Both are 19!!!.
Yes we worked from 12pm TH until 2am Fri, came to my house to sleep a bit and my kids start getting up at 6-6:30. We left here to stop at the parts stor and was working again by 10am. I stayed at it the couple of times they had to run and get something (I'm the only welder) and we started the car about 8am. He ended up spending 1/2 the origional quote he got - through me
It was actually really fun, just tiring. THEY are still quite a bit younger and had more energy. We hardly stopped to eat or drink, lol.
Ther was actually three of us, and it's funny - I thought for sure they were at least my age. Both are 19!!!.
Yes we worked from 12pm TH until 2am Fri, came to my house to sleep a bit and my kids start getting up at 6-6:30. We left here to stop at the parts stor and was working again by 10am. I stayed at it the couple of times they had to run and get something (I'm the only welder) and we started the car about 8am. He ended up spending 1/2 the origional quote he got - through me
It was actually really fun, just tiring. THEY are still quite a bit younger and had more energy. We hardly stopped to eat or drink, lol.
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Re: How much boost for 9.1-1 cr?
LOL
Ther was actually three of us, and it's funny - I thought for sure they were at least my age. Both are 19!!!.
Yes we worked from 12pm TH until 2am Fri, came to my house to sleep a bit and my kids start getting up at 6-6:30. We left here to stop at the parts stor and was working again by 10am. I stayed at it the couple of times they had to run and get something (I'm the only welder) and we started the car about 8am. He ended up spending 1/2 the origional quote he got - through me
It was actually really fun, just tiring. THEY are still quite a bit younger and had more energy. We hardly stopped to eat or drink, lol.
Ther was actually three of us, and it's funny - I thought for sure they were at least my age. Both are 19!!!.
Yes we worked from 12pm TH until 2am Fri, came to my house to sleep a bit and my kids start getting up at 6-6:30. We left here to stop at the parts stor and was working again by 10am. I stayed at it the couple of times they had to run and get something (I'm the only welder) and we started the car about 8am. He ended up spending 1/2 the origional quote he got - through me
It was actually really fun, just tiring. THEY are still quite a bit younger and had more energy. We hardly stopped to eat or drink, lol.
#30
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Car: 91 z28
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Re: How much boost for 9.1-1 cr?
depends on alot of things...CR, fuel grade, fuel management, turbo sizing, rpms, tuning, heads and cam combo etc. too many factors
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Re: How much boost for 9.1-1 cr?
..................cause you know once you get that first full blast of full boost, you will be walking around with a big silly a$$ grin on your face all of the time
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Re: How much boost for 9.1-1 cr?
Ha hA....I just got done spending close to 600 on pistons plus 280 for rings, plus 3000 for a blower, plus whatever it'll cost for a fuel system to feed this thing...plus a rotating assy balance - and a distributor....join the club!!
#41
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Car: 1982 Trans-Am
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Re: How much boost for 9.1-1 cr?
I was about to say it Confuzed, but you beat me to it.
Makes you wonder why people will spend more to get 3/4 of the power
Ahh, don't get me wrong, i'd like nothing more than another Royal Blue 1993 Pontiac Sunbird with the 3.1L, except with a turbo charger. But in a muscle car? Nah, needs 8 spark plugs
Makes you wonder why people will spend more to get 3/4 of the power
Ahh, don't get me wrong, i'd like nothing more than another Royal Blue 1993 Pontiac Sunbird with the 3.1L, except with a turbo charger. But in a muscle car? Nah, needs 8 spark plugs
#42
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Re: How much boost for 9.1-1 cr?
I was about to say it Confuzed, but you beat me to it.
Makes you wonder why people will spend more to get 3/4 of the power
Ahh, don't get me wrong, i'd like nothing more than another Royal Blue 1993 Pontiac Sunbird with the 3.1L, except with a turbo charger. But in a muscle car? Nah, needs 8 spark plugs
Makes you wonder why people will spend more to get 3/4 of the power
Ahh, don't get me wrong, i'd like nothing more than another Royal Blue 1993 Pontiac Sunbird with the 3.1L, except with a turbo charger. But in a muscle car? Nah, needs 8 spark plugs
You have to remember I have done all the V8 stuff. Best car my friends and I built was a 355/th400 in a 1986 Mustang notchback. It ran 11.8x on the motor and a best of 10.33 on the juice. This was >10yrs ago, though.
I build these V6's for fun, nothing more. I have vehicles from 6 to 10 cyls in my driveway.
Maybe to you thing there is nothing like having 8 sprak plugs, but it's even better when you toast a BBC with a 200 something ci engine in a car that weighs the about the same :P
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Re: How much boost for 9.1-1 cr?
I've got a 9.1:1 iron headed 350 scb and have been running a P1sc procharger blow-thru for a while @ 10 lbs with no issues. Still on cast pistons and nodular crank. It runs real strong-
http://www.youtube.com/watch?v=zuaVGZfjkcM
http://www.youtube.com/watch?v=zuaVGZfjkcM
#44
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Re: How much boost for 9.1-1 cr?
Holy hell, you guys grabbed this thread and ran off to turbo land with it.
Just kidding, xpdbl13, I have the utmost respect for your car. Just your car.
I didn't know that about boost and the bottom end.
I just got my sumped tank in and will be bolting up the supercharger this week. Should only take a day, its been on and off many times with the old engine, so I know my way around it. Got my LM-1 in hand. Need to get my new rear tires and wheels put together and on this week too. Should a be a fun week!!!!
Still stock rear though................
Just kidding, xpdbl13, I have the utmost respect for your car. Just your car.
I didn't know that about boost and the bottom end.
I just got my sumped tank in and will be bolting up the supercharger this week. Should only take a day, its been on and off many times with the old engine, so I know my way around it. Got my LM-1 in hand. Need to get my new rear tires and wheels put together and on this week too. Should a be a fun week!!!!
Still stock rear though................
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Re: How much boost for 9.1-1 cr?
Holy hell, you guys grabbed this thread and ran off to turbo land with it.
Just kidding, xpdbl13, I have the utmost respect for your car. Just your car.
I didn't know that about boost and the bottom end.
I just got my sumped tank in and will be bolting up the supercharger this week. Should only take a day, its been on and off many times with the old engine, so I know my way around it. Got my LM-1 in hand. Need to get my new rear tires and wheels put together and on this week too. Should a be a fun week!!!!
Still stock rear though................
Just kidding, xpdbl13, I have the utmost respect for your car. Just your car.
I didn't know that about boost and the bottom end.
I just got my sumped tank in and will be bolting up the supercharger this week. Should only take a day, its been on and off many times with the old engine, so I know my way around it. Got my LM-1 in hand. Need to get my new rear tires and wheels put together and on this week too. Should a be a fun week!!!!
Still stock rear though................
So you are still rocking the 3.08 open diff? I am guessing since it is a 91 rs. in the same boat but torque over cam the gearing with low thirteen second blasts. lol
#46
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Re: How much boost for 9.1-1 cr?
I thought they were 2.73s....? Yep open diff. But with the new motor it lays both tires down. I bought some 4.10 gears and a locker but dont really know how to put them in myself and dont want to pay to have it done, when ill be buying a whole new 12 bolt soon.....
Yea those gears are worthless, but with stock tires, they just smoke anyway until I hit third.
Yea those gears are worthless, but with stock tires, they just smoke anyway until I hit third.
#47
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Re: How much boost for 9.1-1 cr?
Depends on what engine and tranny it came with. I know tbi 5 spd came with 3.08's
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Re: How much boost for 9.1-1 cr?
Originally Posted by Sonix
But in a muscle car? Nah, needs 8 spark plugs
-Rob
Last edited by Street Lethal; 01-07-2008 at 04:50 PM.
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