Greg Smith

Yes sir.

onefastviking

I think it's a little lighter now........

onefastviking

I did promise you that didn't I, good memory.

disasterman

I see a lot of extra bits in there, get a sawzall.

onefastviking

Oh don't worry, that is just the beginning,taking out all the easy stuff !

Waco Racer

All I can say is - When is it going to be finished?

Lemming

Owner???

Waco Racer

Even better - Driver!

Brinkley

Onefastviking-
As a long time Boxster racer, can I ask a simple question regarding NASA rules. I have not gone onto their website or tried to decipher the classes so can you bottom line it to me? I heard you take the cars rwhp and divide by weight, no?

I will tell you as someone who runs an extremely light boxster with an '05 996 motor its a blast to race. I run in PBOC here in FL but am interested in learning more about NASA.

Can you guys help educate me?

KRA993tt

4. Classification
There are six classes for GTS: GTS1, GTS2, GTS3, GTS4, GTS5, and GTSU. All cars
will be classed on a power to weight ratio. A vehicle's classification and minimum
allowable weight (as the car would exit the track with the driver) will be determined by
multiplying the appropriate class weight ratios by the vehicle's power. "Power," as used
here, will be determined from a minimum of three consecutive dyno pulls, and shall be
defined as:

a) the horsepower value from the single run with the highest horsepower reading (for cars
with higher horsepower than torque);



or,

b) the average of horsepower and torque from the single run with the highest average of
those values (for cars with higher torque than horsepower):




The following table shall be used to determine each car’s class based on the calculations
determined using the above methods.

D.O.T. Approved Tires Non-D.O.T Approved Tires
GTSU <5.99 GTSU <6.49
GTS5 6.0-8.49 GTS5 6.5-8.99
GTS4 8.5-10.99 GTS4 9.0-11.99
GTS3 11.0-14.49 GTS3 12.0-15.99
GTS2 14.50-18.49 GTS2 16.0-19.99
GTS1 >18.50 GTS1 >20.0
Weight
WHP
Weight
(WHP+WTQ)*.5

Brinkley

Keith,

Thanks...so let me see if I got this with a hypothetical math problem.

Car weight including driver at the end of a race: 2775

Rear Wheel HP: 250

2775/250=11.1

Therefore NASA class on Hoosier R6 DOT would be GTS3.
Correct?

bobt993

^^^^^^^^^^ Correct. Get a dyno from one of their cert centers. If torque exceeds hp, then add them together divide by 2 for hp to wght ratio. R6 is fine. You can even run A6 if your easy on tires for a sprint race.

Streak

Brinkley,

Don't rely on one dyno shop. I used the closest approved dyno shop to me and they had my stock, I do really mean stock even the stock chip, 911 at one hp less than the crank. Now the Germans are good but to lose only 1 hp from crank to wheel is a bit of a feat even for them.

This place catered to the tuner crowd so I truly suspect he had it calibrated to make the tuners feel good after he sold them some go fast bolt ons.

I was in a real predicament because I was about to bolt in 135 pounds to make GTS2 or go GTS 3. Everyone I asked said that something was amiss and I went to another shop and got a reading much more consistent with real life.

Lemming

Brinkley, I am a little less that 11.1, with less HP and less weight. GTS3 is what you would be racing. Just curious as to what class they have you in for PBOC? PBOC classified me as R4, yet many of the cars that I race against at PBOC are GTS4 cars, and my car is definately a GTS3 car

KRA993tt

You got it, but I do it this way. 250 x 11.0 = 2750 minimum weight. So to be safe at the end of the race 2775 is fine. Sounds like your car fits in nice to GTS3.