Gary R.

I can't see how a 993 would be in GTS-2 with 180HP SC's! Have to be one heavy 993! Not that we wouldn't love to have you Mark!

Sean F

Gary, remember that we can run a lot lighter in NASA than PCA. IIRC we can run at about 2550 with driver with NASA vs. 2702 with PCA (based on running at 175 hp/175 TQ at the wheels from my last dyno)

Mark in Baltimore

I'm still running numbers, but all I know is that if I run in NASA in GTS2. . . I get to eat more pizza!!!!

Gary R.

You and I both need a new dyno run, we should go together, be cool to see how our engines fare now. I was at 2515 with 1/4 tank of gas with the yellow car (w/o driver) and I don't know how much lighter I could make it, this car should be the same.

bobt993

Mark, I am setup for the VIR race in GTS2................. Between 150 and 200 lbs ballast. One advantage to the 993 is aero.

Sean F

Let's do it...dyno day

BTW, you can be lighter by the amount your passenger seat weighs. NASA is not hung up on having a passenger seat in the car.

Gary R.

And 6 gears, and better brakes, and better suspension, and 100 more HP...

Thats about 15 LB., but I would take it out just for the better visability!

Mark in Baltimore

So, what is the max ballast weight I can run in NASA? I checked the rules but can't find any info. It looks like I'll need 150lbs of ballast to make it into GTS2.

<edit> Oops, missed Bob's post. 150lbs of ballast? Damn, that's a lot of lead (or depleted uranium).

Jim Child

I don't believe that there is a maximum amount of ballast. It just needs to be properly secured. It would be great to get some 993's running in GTS2.

John H

Mark,

I thought about GTS2 but thought I had to add more weight than 150. Maybe there are more pieces missing from my old car than yours? How much ballast did you have to add under the old class system? IIRC, I was adding 100 lbs to make weight in PCA.

Mark in Baltimore

John,

Under the old system, I needed about 45lbs with 1/8 of a tank of gas. I carried 60lbs just in case. Sounds like your carbon fiber pistons really helped with the weight.

John H

Carbon fiber pistons. Could that be the cause of the loud knocking and horrible compression? Seeing that car sitting in the garage with a bum engine and unplanned "body work" is killing me. We should start giving Joe L. the treatment for not properly setting his priorities.

Mark in Baltimore

Still busted up from Watkins Glen?

John H

Yeah. We did some backyard stuff and got it looking okay for a NASA event and he then proceeded to miss the 3-4 shift mistakenly finding 2nd. It was winched into the trailer, rolled into the garage and hasn't moved for over 6 months. The car has in excess of 140,000 on the virgin motor so no one is really complaining.

Bull993tt

Remember guys, The GTS web site rules are a little misleading at first glance. The formula that they show factors torque into the equation. But if you read the paragraph above that it implies that torque is only a factor if it is greater then your RWHP which on Normal Aspirated cars it is not. That formula applies to forced induction applications (ie. turbo's and Superchargers). So again, if your torque is not greater then your RWHP you divide weight w/ driver and gear by RWHP. Torque is not factored into the equation in this this case. My estimate for you Mark is 3200 lbs / 220 RWHP (not flywheel HP) = 14.54 which puts you in GTS2 w/out adding weight by the skin of your teeth. 14.5 is the cut off for GTS2. If you fall below that, you are in GTS3. If your RWHP comes in a little higher and/or your car and gear weighs a little less, then you will have to add a little weight. I will bet I'm pretty close in these estimates.