Hi guys (and gals...),

I just registered here but have been lurking for a while so I know there are at least a couple of you that run D class turbos in PCA club racing.

I need to know a couple of things if you guys don't mind sharing some info:

First, is the fuel tank capacity for the turbo the same as other C2s (17 gals. approx.) or was it increased?

Second, are you able to run a one hour enduro on a single tank?

I'm building a GT-1r 914 with a '91 3.3 turbo engine (please stop laughing...)and we're trying to figure out how much fuel tankage we need...

...then we have to figure out where to put it all.

Any help appreciated...

Cheers!

Mike

 

Mike,
Welcome.

Check out this link, a lot of info.
http://www.porscheclubgb.com/uploads/registers/53/

 

On a racetrack my ca,r a 964 turbo 1991, uses about 1 - 1.2 litres of fuel per minute. I would say it's a close call, but the car you are building will probably be much lighter so odds are in your favour.

 

The C2 Turbos can barely make the mid-way point of a PCA 1.5 hour enduro. I do not think you can do 1 hour without refueling.

Also, according to Porsche's Technical Specifications book, all U.S.A. 964s (C2, C4, Turbo, Turbo 3.6) have a 20.3 gallon tank.

The turbos are gas guzzlers on the track at a rate you almost can't believe! As Staffan said, your dramatically lower weight might help you, though.

No laughing at that project. You could make a <2000 lb, 500+ hp car fairly easily with the setup you're shooting for. The thing will be insane.

 

Drat... Looks like it's custom fuel cell time.

I figured I would need 22 - 25 gallons to make a one hour enduro without refuelling, but I was hoping that was a bit pessimistic. (PCA Zone 8 rules no longer allow refueling in one hour events. Not sure about other zone rules...). There's room for that much fuel, but not to fit a readily available cell that size.....

Could be a bit of a help. The car should come in a bit under 2000 lbs., but I don't know how much that'll make up for... !

Thanks. Its got a semi-tube frame built into a '73 914 tub. Not much 914 left! The motor is a '91 3.3 turbo with a mild street tune by Andial. The plan is to get the chassis dialed in and then start working on increasing power a bit. I'm using the G50/50 gearbox flipped over to run mid-engined, oil pump and squirters to keep it slick. 16x10s up front, 16x12 or 14s in the back, wings, fins, splitters, diffusers, etc. to keep it stuck to the ground... You get the idea. Light weight, big power, lots of downforce, big bills for cleaning out the ol' driver's suit!! Should be fun!

Thanks for the info guys!

Cheers!

Mike

 

Sounds awesome. I assume you'll be running the 16" Goodyear slicks. I can tell you the grip on those things is insane. One thing is that make sure you have lots of spares. They only make them 3-4 times per year in a plant in south america, and they sell out almost immediately. With that much power, you will likely go through a set of rears in 1-2 days. The fronts should last 4-6 days. I'd try the R600 for practice and the R430 for races (I only ever used R430). I'm not sure you'd need to go to the 14s unless you are planning on running 450+ hp.

 

Thanks for the tip! I wasn't aware of the supply issues, I'll be sure to stock up.

I figured the R600s would work fine at least until everything is dialed in. I haven't used them either but I figure they'll be good enough at first.
We used to run a GT3r 944 turbo on 18x12s (all round) and ran the R430s most of the time. We were able to get about two weekends out of 'em if we were careful. Ran the R360s a couple of times... WOW! Those things stick like burned lasagna but only lasted one event, and then only if treated nicely.

Cheers!

Mike