69427

I've been looking at some old IMSA stuff on the computer, but have struck out trying to find some technical info on the short lived turbo Corvette that ran in IMSA for a while. Can anyone help me out here?

TIA

env00

I think you mean the Corvette GTP...V6 turbo...raced in the late '80s (IMSA GT/GTP & Trans Am races).

If so try doing a search on "Corvette GTP". This is what I came up with:
http://www.corvette.nl/specials/GTP.html
http://www.4-lesco.com/pages4/car4sale6.html

Good luck,
- Eric

0Randy@DRM

We played around with IMSA for a year or so. http://www.conceptcarz.com/vehicle/z12221/default.aspx

Callaway did the motor stuff and we built the chassis. Boris Said did most of the driving.

Randy

69427

I apologize, I should have been more specific. I believe it was a ProtoFab car and ran in the GTO class. I keep striking out looking on the usual search engines.
Thanks again.
Mike

0Randy@DRM

I think I know what you are talking about. I was pretty young back in those days. I will have to ask Doug about this. On Fridays we talk old racing stories and the pictures get around. Doug drove one of the Greenwood tube frame cars. Pretty crazy car for back in the day.

Randy

rasrboy

My friend builds replica's of the old Corvette GTP just in case your interested. He has some knowledge of the old IMSA GTO,GTU stuff I believe.

Here's the link. www.mongoosems.com

bjm

You might want to look here for some info if they are the Greenwood cars!

www.greenwoodcorvettes.com

0Randy@DRM

http://www.racingsportscars.com/phot...-01-31-002.jpg

Is this the car?

Randy

gkull

In 1980 and 81 C-3 twin turbo Vettes were competing in the IMSA series. I bought the 81 TT lightweight front end and cloned it onto my 79.

The thinner fiberglass front ends were a 150 lbs reduction

gkull

http://www.greenwoodcorvettes.com/StreetGTO.html

Look around on this site.

69427

You are correct. I saw this and other somewhat similar Corvettes running IMSA races at Mid-Ohio in the late '80's. IIRC, (emphasis on IIRC), the Toyota (Celica?) turbos were doing quite well, and somebody at Chevrolet convinced IMSA to relax the rules to allow Corvettes to run a turbo engine to try to match the horsepower of the Toyotas. I've been trying to find out some documentation or technical info on the one or two sister car oddities that tried the turbo engine. So far I've been striking out finding anything other than the occasional picture of the (NA) team cars, or qualifying/finishing order for different races. Any help is appreciated.
thanks,
Mike

Darrell Hornbacher

I worked for Polyvoltac in the 1980's and we had two Vettes running IMSA. If you have any questions about these cars, you can find Paul Dallenbach on Facebook and ask him. He was a back up driver and his brother Wally drove the #5 car.

GigG

Literally the best 1st post ever.

69427

Thanks, friend. I was always curious about the turbo engine, but have never seen any underhood pictures or any technical details about it.

I'm one of the fourteen people on Earth who's not on facebook, but perhaps I can ask my wife to look for Paul Dallenbach's account there.

Thanks again,
Mike

Penz_385

Same here! I'm also one of those 14, but it would be cool to see information about those cars.

Josh

KO433

Mike,

I know I'm a few years late to this thread, but we own the car now and just finished the restoration on it recently. It ran for the first time in decades this last weekend at Monterey with Ron Fellows driving after a several year restoration by Dan Binks.

Here is an in car video: https://racer.com/2023/08/19/750hp-1...Y0MSPDFzJOec6U

I know this car is a bit of a mystery so I'm happy to answer any questions you have about it. And yes, you are correct it ran in the Polyvoltac livery in '88, in '87 it was Mobil 1, which is the livery we put back on it. It always ran as the #2, but they had an identical V8 chassis they used for the longer races due to reliability issues with the turbo, so looking at old pictures the only obvious visual cue is the exhaust on the V6 is right behind the front wheel whereas the V8 exits right in front of the rear wheel.

I'll post some more pictures tomorrow when I get a chance.

69427

Excellent! I enjoyed the video. I'm interested in any and all details you wish to share about the car and engine.

Been busy working on my car so I hadn't checked in as much as usual, but I'll keep an eye out for any thread updates.

Thanks!

69427

ttt

One more try, just in case K0433 shows up again.