BlueBarchetta

True, but BFG makes R1 and R1s in 255. I ran them in 225 last year and actually like them.

josserman

But R1's get taxed heavy in xt1-3

BlueBarchetta

I'm a little confused. Are you looking at 2014 TT rules? 2015 TT hasn't been published yet, however you can go nasa website for 2015 PT/ST rules.

In PT rules BFG R1=Hoosier R7, R1S=A7. Basically TT B-F follows PT. I thought TT1-3 follows ST rules. Thought TT 1-3 rules were "unlimited tires" as long as they were DOT

King Tut

Yep in TT3-TT1 the main thing that matters is whether you are running 245s or smaller and 255s or larger. You have to take a power hit to run 255s, so I would probably drop down to a 245 to get the power back.

josserman

I think I was wrong about BFG's. Looks like we can run the 245's on my 17x10's so im probably going to go that route. Was vetted by head tire guy on a pro conti race team.

aCab

Man, gotta get to work on my TTC build....as long as I decide not to pick up an e46 m3 or C5Z06 that is.

s2000ellier

i'm planning to dyno reclass my AP1 @ 215whp to TTC, what weight should I target for the reclass? I assume I cannot just go for lowest weight that would get me the 12:1 for TTC right? I thought greg had some hidden table that modifies the final numbers.

ideally I would shoot for 2600lbs +- a few for gas

King Tut

You don't get to shoot for anything. If you have 215 whp and you want TTC, then Greg will tell you exactly what weight you will have to be. When doing a NASA dyno reclass you tell Greg two of these three and he will tell you the third:

1. WHP
2. Weight
3. Class

Also know that you will not get a weight anywhere close to the TTC class weight to power ratio limit.

s2000ellier

Sure but its not like the weight he assigns will be 3000+ lbs, I imagine someone here can ballpark it based on their experience?


Currently the car is around 2900lbs

King Tut

Well judging by this from the TT rules:

S2000 (2.2L)('04-'08) TTC 2850

and the fact you are making more whp than a non modified F22, it will be higher than 2850. I don't see it being lower than 2850.