327???

according to the sticky you can use something like a deisel truck turbo or car. i have a couple of questions

is anyone here running a setup like that on a v8.
did you build it.
how much power.
how hard to do.
would 450-500 hp be possible / worth the effort

after looking at the sticky it got my attention.
thanks all

Bob

89JYturbo

I built a 'junkyard' turbo system for my '89 IROC. I used two 45 trim T3s from Volvos on a bone stock 90,000 mile L98. Everything on the engine was stock, even the exhaust manifolds were just modified to mount the turbos. At only 6psi of boost, I ran a best 1/4ET of 12.46 and a best 1/4 Trap of 117mph (two seperate runs). It dynoed at 327RWHP, and 468RWTQ. Hp was less than stellar because the turbo turbine housings restricted high RPM performance- its a low RPM torque monster though ). There is a lot more potential in the new turbos, though I haven't raced them or dynoed with them yet.

I felt the turbo project was worth every penny and all the effort (but it is a lot of work!).

Original combo as a work in progress:


Original combo, finished:


I then upgraded to larger T3/T4 hybrid turbos while I had my car apart for the repaint, but otherwise its the same basic turbo system:


Junkyard Ford Probe intercoolers mounted in front of each front wheel:

327???

thats pretty cool. how much do you think it cost.
stock internals?
stock cam?
stock tires?
i would think a single turbo would be easier to fab up, but i bet the airflow wouldnt be there though
(i am completely new to turbos if you cant tell)
it all looks really good

89JYturbo

The turbo system cost around $3000 in parts. You could do it for less with careful shopping. The second phase added about $1000.

The 12.46 was on drag radials, while the 117mph trap was on street tires.

327???

did you do all your own work?
did the 3000 include the original turbos only or just the newer ones

ttypecamaro

iTrader: (2)

I recently put twin turbos on my 92 camaro. I spent <$1400 on turbo related parts doing all the work myself. It sounds cheap because I didn't account for the programmable engine management $1000++ that I was already using. It took a year of research, planning, and coming across good deals to gather the parts, but I got all the fabrication and installation done in like 13 days. I used Chrysler t3's (manufactured by Garrett) because they are cheap to buy remanufactured or used. the flange is hard to find though. I bought some ceramic coated block hugger headers and cut them up and welded up some turbo headers. Got most of my intake piping from McMaster-Carr as well as some downpipe materials. I used two Thunderbird turbocoupe intercoolers and mounted them in the front. This project was more of a challenge to see if I could do it then for extreme performance increases (though I got both). I rebuilt an old truck 350, slapped vortec heads on it and a TPI. at 6 psi I ran a 13.249 at 109mph with a 2.0 60ft. I blame the slow time on the driver (me), old dry rotted street tires, and the lack of a WOT 2-3 shift on the stock 700r4 (40k since rebuild). The transmission is not holding up, so add another $1000++ to the total. Once I got it to shift to 3rd I actually started to close the gap with the 12.011 @112.5mph transam I was racing with. I'm pretty proud of myself for doing this to my car and it was worth every dollar.

89JYturbo

No, the $3000 included only the 'JY' turbos. The newer turbos were an extra $1000.

The $3000 price figures in everything from fuel control, intercoolers, plumbing, turbo rebuild kits (I rebuilt them myself), stainless lines and AN fittings, MSD ignition/BTM, everything except the cost of my labor.

327???

thanks for the replys.
if i did it it would be carb'd and i would do all my own work.
it'll have either a th350 or 400 so no worries there
this has really made me think about doing it. not for extreme performance but just to see if i can as you said.

any one else with pictures of a homebrew kit???
ttype what do you think you would have ran if the tranny shifted
thanks
bob

ttypecamaro

iTrader: (2)

I think I could have pulled a 12.8 around 112. I was also running out 3rd gear at like 6500rpms through the traps because of my 3.73's. I want to step down to 3.23's.
My dad's friend at work (General Motors) said he did a 350 with a turbo and a blow through carb. He said he could never get it tuned just right. He said those carbs are better for superchargers because the boost increases more linearly with rpm.
If money is an issue, fuel injection could end up being cheaper (if you already have it). just repin for the syclone ECU and map sensor, get chip burning software and hardware, then tune(though easier said then done).
I need to take some pictures of my stuff.

89JYturbo

There seem to be more and more guys having success with blow-through carb turbo systems. I heard of many guys on the GM section of TurboMustangs.com send their carbs to CSU for modifications.

I think it can be made to work quite well, though I am not speeking from experience (I'm an EFI guy).

327???

i am carb'd now, its a holley 650 dp.
i was thinking of a carb box.
i would go efi if i got a real good deal on the turbo stuff. it is a bit of a money deal.
can the carb shop modify a holley to work without a box?

89JYturbo

Yes, I'm sure they can. Contact them for the details.

327???

thanks, when i get around to doing this ill give them a call.
thanks for all the help.
any more 'JY' turbo pics anyone???

327???

another dumb question.
should the exhaust piping that goes to the turbo be stainless??

Steven89Iroc

Ideally, but it doesn't have to be. If it's not, definitely have it ceramic coated. If it is, have it ceramic coated anyway.

327???

thanks, i think the coating looks cool anyway. another rather noobish question
is there vacuum when the turbo isnt spooled???
if not how do you use power brakes???
thanks again

ttypecamaro

iTrader: (2)

Mine drives just like it did before the turbos at lighter throttle positions, plenty of vacuum. you don't lose vacuum till you start getting on it. As an example, crusing on the highway at 2500-2800 my car has the same vacuum as idle (13inHg according to gauge) because cruising there puts light load on the engine. it doesn't start to spool up untill you put moderate to heavy load on the engine. Its hard for me to explain... the turbos won't spool fast unless you give it enough throttle to accelerate the car "aggressively". the zone where the turbos start forcing air into the engine can be different on each setup. It can start forcing air past the throttle plates during part throttle vacuum conditions and continues to do so into boost untill the throttle plates or the wastegate(s) regulate the peak boost level. Wastegates regulate peak boost by bypassing exhaust past the turbine. The throttle plates regulate boost by restricting air flow into the engine. Sorry if this stuff is way too elementary, just trying to be thorough.

Probably due to exhaust leaks in my headers(I welded them) my turbo shafts can be stopped with my thumb at idle, though I don't recommend putting anything anywhere near those blades.

Most power brake boosters have a vacuum check valve on them, and you won't be braking and under boost at the same time.

327???

thanks not to elementary but close

327???

sry about double, comp took to long to load and i got impatient