Originally Posted by JDavenport

Actually

245 and under DOT Slick, 0.8 favorable adjustment to power to weight
255-275 DOT Slick (Except the BFG R1) 0.4 favorable power to weight adjustment
Above 275 DOT slick, 0 Adjuster on power to weight

TT3 is 9.0 to 1 Power to weight.

Adjusters:

AWD -0.5 Adjuster
4-door sedan +0.4 adjuster
275 Hoosiers +0.4 adjuster

So applying these to the 9.0-1 class target you get an adjusted power to weight of 8.7-1. For a 3160 track weight evo, that means around 363 awhp.

For 285's you loose the 0.4 favorable which makes the adjusted power to weight 9.1-1, or around 347 awhp.

Of course you could run 245's and have an adjusted PTW ratio of 8.3-1, 380 awhp. But I've been on 245's for a while now and I don't think it's enough tire for our cars on the track.

And on the BFG R1 275's, they run a good bit wider than Hoosier 275's, so NASA has declared them in essence a 285 tire, so you loose the 0.4 favorable adjuster.

Originally Posted by honda-guy

so the short answer was, tires larger than 275 has a penalty of .4

Originally Posted by drivinhard

Jim what did you decide?

TT3 in March RA?