My turbo 4.8l 87 IROC build
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
thank you. hoping i didnt get screwed on the headers but the way things are lookin i think i did. think im goin to buy some flanges and take them to my exhaust guy.
so decided to mount my battery box and see how the shifter looks with the console in.




oh got another lip the other day. $58 shipped off ebay.
so decided to mount my battery box and see how the shifter looks with the console in.




oh got another lip the other day. $58 shipped off ebay.
Joined: Jan 2002
Posts: 757
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From: Middle of MI
Car: 1989 Trans Am GTA
Engine: Stock LS1
Transmission: T56
Axle/Gears: 3.70 9 bolt
Re: My turbo 4.8l 87 IROC build
Wow, good looking build!! I've been happy driving mine around for the last summer and a half, really need to button the rest of it up
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From: Verona Va
Car: 86 Trans Am,03 Yukon,92 Z28
Engine: 5.3, 5.3, lb9
Transmission: th350,4l60e,700r4
Axle/Gears: 3.73,3.73,2.73
Re: My turbo 4.8l 87 IROC build
Not wild about the shifter personally but looks like good machine work.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
im not a big fan of it either but it actually feels nice. i do need to bend the handle a bit more towards me, i feel like the shifters in the passenger seat.
Joined: Sep 2004
Posts: 1,320
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From: Verona Va
Car: 86 Trans Am,03 Yukon,92 Z28
Engine: 5.3, 5.3, lb9
Transmission: th350,4l60e,700r4
Axle/Gears: 3.73,3.73,2.73
Re: My turbo 4.8l 87 IROC build
Ah. That's the eBay lower shifter correct. Was wondering how it would be with no bend
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
Yeah thats the ebay short shifter thats like $30 or so.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
thanx its goin to be a little while now cause i got a job again. good thing though is the guy builds races cars and stuff so im goin to try and add a cage in sometime. lol
we also build/work on kit cars. my first 2 days ive been working on this thing.
we also build/work on kit cars. my first 2 days ive been working on this thing.
Joined: Aug 2009
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From: Clinton Township, Michigan
Car: 91 GTA, 73 Z28
Engine: 355, 6.0L
Transmission: TH350, 4L80E
Axle/Gears: 3.42, 3.73
Re: My turbo 4.8l 87 IROC build
what is that, its sorta ugly and tiny but intriguing
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
its called a Ginetta, this one has a 1.8l ford zetec motor from europe. the whole car weighs 1400lbs. the car behind it is also a kit car. that one has a northstar style motor in it.
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From: Lafayette, IN
Car: '85 IrocZ
Engine: LS1
Transmission: 4L60E
Axle/Gears: 3.73
Re: My turbo 4.8l 87 IROC build
there have been some interesting custom cars that are northstar/aurora powered!
alot of people like to toss those aurora into dune buggies
alot of people like to toss those aurora into dune buggies Thread Starter
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
heres the other car. my boss said these are my 2 babies. i gotta do a **** ton of wirinf on both of them.


Joined: Jan 2002
Posts: 757
Likes: 10
From: Middle of MI
Car: 1989 Trans Am GTA
Engine: Stock LS1
Transmission: T56
Axle/Gears: 3.70 9 bolt
Re: My turbo 4.8l 87 IROC build
Wow, those are some really sweet cars. looks like you have your hands full. What kind of time frame do you have, or is it a situation where the customer doesn't have a short deadline?
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
been busy workin and havent got to mess with the car much lately.
but i decided to finally fab up my gauge pod. ive had this stupid aftermarket stereo mounting thing in my shed and always wanted to see if i could make a gauge pod out of it. my dash is all cracked anyways so if it didnt come out good it didnt bother me.







but i decided to finally fab up my gauge pod. ive had this stupid aftermarket stereo mounting thing in my shed and always wanted to see if i could make a gauge pod out of it. my dash is all cracked anyways so if it didnt come out good it didnt bother me.







Joined: Aug 2009
Posts: 2,098
Likes: 8
From: Clinton Township, Michigan
Car: 91 GTA, 73 Z28
Engine: 355, 6.0L
Transmission: TH350, 4L80E
Axle/Gears: 3.42, 3.73
Re: My turbo 4.8l 87 IROC build
doesnt look horrible, could be slightly smaller imo but looks good. shouldve made it so i had a slight angle to it so it was in you visual direction more
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
i thought about turning it slightly but couldnt do it cause of the mounting.
Joined: Nov 2007
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From: Mechanicsville Virginia
Car: 1989 Turbo Trans Am gta
Engine: 383 78mm turbo
Transmission: Th350 rmvb with brake
Axle/Gears: 9 bolt 3.45s
Re: My turbo 4.8l 87 IROC build
Looking great so far!! Keep the pictures coming
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
so yeah i think USPS lost my headers i bought. they were supposed to be here on the 2nd but arent here yet. soo pissed if they dont come.
on another note i bought a new badass turbo for $70.
heres the specs:
T76 .81AR Turbo : Godspeed Project
Description : T76 T4 GODZILLA T4 .80ar compressor .81ar turbine
FREAKING HUGE COMPRESSOR HOUSING , 1000 HP !!!!
(check out the picture with the turbo next to the soda can. you can imagine the size of this turbo charger.)



heres the specs to my old one (well close to the specs):
Compressor: Turbine:
Trim: 59 Trim: 62
Inducer: 56.2 Inducer: 73.9
Exducer:72.9 Exducer: 58.3
A/R: 0.70 A/R:0.84
Intake inlet & outlet: 4.25" & 2.5"
on another note i bought a new badass turbo for $70.
heres the specs:
T76 .81AR Turbo : Godspeed Project
Description : T76 T4 GODZILLA T4 .80ar compressor .81ar turbine
FREAKING HUGE COMPRESSOR HOUSING , 1000 HP !!!!
(check out the picture with the turbo next to the soda can. you can imagine the size of this turbo charger.)
- Intake :3.95 inch
- Outlet: 2.5 inch
- Compressor trim: .80 ar
- Compressor Wheel diameter 76.80mm / 102.35mm
- Turbine Wheel diameter 72.78mm /64.20mm
- Exhaust trim: .81ar
- Turbine flange type: t4 flange
- Downpipe flange type : 3 inch v band flange
- Cooling type: oil cooled only
- Horsepower rating: 1000+ hp



heres the specs to my old one (well close to the specs):
Compressor: Turbine:
Trim: 59 Trim: 62
Inducer: 56.2 Inducer: 73.9
Exducer:72.9 Exducer: 58.3
A/R: 0.70 A/R:0.84
Intake inlet & outlet: 4.25" & 2.5"
Thread Starter
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
aaaaaaaaaaaaaaahhhh yeah finally got my headers today!


Joined: Aug 2009
Posts: 2,098
Likes: 8
From: Clinton Township, Michigan
Car: 91 GTA, 73 Z28
Engine: 355, 6.0L
Transmission: TH350, 4L80E
Axle/Gears: 3.42, 3.73
Re: My turbo 4.8l 87 IROC build
lmao you had to talk about how they havent arrived for them to arrive.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
yeah it was funny i walked outside and i hear the mail lady yell out hey i got a package for you. i got soo excited and ran over, saw the box and was like **** yeah!
got one side on before it started raining. ran into a little issue since he made them for corvette accessories in his 3rd gen. whatever ill figure something out. i was just happy to finally get them.
got one side on before it started raining. ran into a little issue since he made them for corvette accessories in his 3rd gen. whatever ill figure something out. i was just happy to finally get them.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
rain went away so put the other header on and took some more pics.












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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
thanx. well my buddy finally took some pics from forza. i want it close to this but minus the canards, and door mouldings. i do wanna add a rear diffuser, clear headlight covers, shape the splitter to the bumper, and my door decals.










Last edited by INTIMIDATOR Z; Mar 14, 2012 at 12:17 AM.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
fired it up today. have to figure out some bugs but at least the motor runs, then its off to exhaust shop for hot side fab.
http://youtu.be/3VSLIJTTYMg
http://youtu.be/3VSLIJTTYMg
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
yeah well no o2s and tune is on a stock 4.8l. but once it learned a little bit it held a good idle with no popping or anything. although im having a issue with injectors 1 and 3 staying open or something cause they dump fuel and flood the cylinder.
Joined: Sep 2004
Posts: 1,320
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From: Verona Va
Car: 86 Trans Am,03 Yukon,92 Z28
Engine: 5.3, 5.3, lb9
Transmission: th350,4l60e,700r4
Axle/Gears: 3.73,3.73,2.73
Re: My turbo 4.8l 87 IROC build
Sweet! I was starting to wonder how your Progress was coming along haven't seen any updates in awhile lol
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
yeah been busy workin. was about to quit so i can finish my car. lol
Joined: Sep 2004
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From: Verona Va
Car: 86 Trans Am,03 Yukon,92 Z28
Engine: 5.3, 5.3, lb9
Transmission: th350,4l60e,700r4
Axle/Gears: 3.73,3.73,2.73
Re: My turbo 4.8l 87 IROC build
lol i just got my camaro outa the garage so now i can take all the stuff off the trans am so i can work on it some.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
nice, whats the plans?
on a side note i finally found a factory fender at the junkyard and it happened to be red. freakin $50 though.
on a side note i finally found a factory fender at the junkyard and it happened to be red. freakin $50 though.
Joined: Sep 2004
Posts: 1,320
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From: Verona Va
Car: 86 Trans Am,03 Yukon,92 Z28
Engine: 5.3, 5.3, lb9
Transmission: th350,4l60e,700r4
Axle/Gears: 3.73,3.73,2.73
Re: My turbo 4.8l 87 IROC build
just finish putting it together and get the rest of the bugs outa my lsx swap. it runs and drives but has no interior and gfx still off the car and tune needs work.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
well just did a couple of little wiring things, turned some stuff off with HP tuners and tested to see if the car goes in gear which is does and cant wait to take it up the street.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
so just got an estimate from Jose to do my full hot side and exhaust how i want it, mandrel bent with v-bands for $600-700.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
finally got to take the car to my exhaust shop. kinda mad cause he broke my power steering reservoir but whatever.










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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
yeah hes workin on fixing it. im not worried.
anyways just got back from the shop. it should be done tomorrow yay. then i gotta jump on the interior and tons of other stuff.
heres some pics i shot real quick.


theyre building this supercharged lt1 for some guys in compton.
anyways just got back from the shop. it should be done tomorrow yay. then i gotta jump on the interior and tons of other stuff.
heres some pics i shot real quick.


theyre building this supercharged lt1 for some guys in compton.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build








and i want this thing. twin turbo SBC turbo 350.

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From: Cali
Car: '85 Camaro
Engine: LS1
Transmission: T56
Axle/Gears: 3.73
Re: My turbo 4.8l 87 IROC build
Dang....the exhaust routing looks pretty good!
So are you having a cutout going to the side of your fender?
So are you having a cutout going to the side of your fender?
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
yeah he didnt want to build it until i buy the cutout so itll fit the hole in the fender perfect.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
havent got to work on it for a while. gauges arent installed yet and i dont think they sell them anymore. found them on ebay but cant find them anymore.
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From: Home of most 3rd gens Van Nuys, CA
Car: 1987 IROC
Engine: Turbo 293ci 4.8l
Transmission: T56
Re: My turbo 4.8l 87 IROC build
soi havent gotten to update you guys on my build in a while. was busy workin so i didnt get to do much work on it. quit my job a few weeks back and just been workin on the car. got it mostly put back together but still need to button some stuff up. been tryin to work on the tune myself (gettin a little better) but will eventually take it somewhere to get dyno tuned.

























