gkmccready

Anybody else notice the new 8.7:1 limit for PTA? It's apparently causing some issues for a few cars that are now scrambling to either come closer to the limit (within the point structure), or limit their power to be able to continue to run in PTA.

This implies that some PTA cars were already running ST1 power-to-weight ratios... interesting, eh?

That aside, any idea why NASA chose to set the ratio the same for PTA and ST2? I guess the theory is ST2 opens up unlimited modifications?

L98Terror proved a mostly stock C5Z could win TTA ... anybody going to try PTA?

magnetic1

It doesnt work that way. It is a limit... PTA is not a weight:HP class. The point of that rule is to say if you had a PTA car with the normal points mods, but somehow made 8.7:1 power, you cant run in PTA.

But I have seen some TTA Vettes turn some blistering times, would be interesting to see one with a full cage running PTA. Though Ive never seen a racecar with a full interior.... :P

gkmccready

Isn't that what I said? If they're placing the same weight:power on PTA as ST2 then they're worried (or know) that some PTA cars are already running ST1 weight:power ratios.

Never seen a T1 car? :-)

magnetic1

HA! Dammit, I was skimming too fast, sorry.

Though I havent seen a PTA car running that kind of power. Perhaps maybe one of those turbo STi / EVOs. ?

RAFTRACER

The 8.7:1 threshold has always been established for TTA and PTA, just not the main factor in those two classes like ST2. Stock 02-04 Z06s flirt with this heavily.....a full cage would help. Anything lower than 8.7:1= ST1 or TTU.........Thats why all of those TTA cars at the NASA Nationals were all across the dyno....checking 8.7:1 compliance.

gkmccready

I hadn't heard about it before. Seems like a lot of the ported and/or forced induction rotaries are now worried about compliance. Seems like other FI cars could easily exceed the 8.7:1 in {P,T}TA, especially if they were willing to sacrifice other mod points.