s2000ellier

yeah if doing a dyno reclass, do every mod in section C that will keep you in your power/weight goal haha

BlueBarchetta

Pat; Basically correct. New rule=Not much change.

However, like I posted in other thread, some cars (BRZ particularly) were able to take advantage of header, and gain a lot of power

MSRS2K

Curious about this too. Currently I'm using 275 on a 17x10 rim. Would I be giving up any measurable grip with 255 on 17x10?

Zip Tied Suzuka

I guess it would depend on your camber setting you could adjust to get the most out of your tire. I think with a smaller tire you wouldn't have to run as much camber to get best contact for the tire, but that is only a guess with no measurements.

DTP525

This statement is incorrect. Remember that if you're under Reclass regs, you have a WHP ceiling AND you have a weight floor. You cannot just do as much engine mods as you would like under a reclass and think that as long as you are within your class pw/wt ratio that you're good to go. Greg G has already figured out what your ratio will be and you cannot do anything power or weight wise to change that after you've received your reclass numbers.

s2000ellier

thats not what i was trying to say.

do not change your car regarding section C once you've dyno reclassed, i meant do all your mods before submitting the reclass

DTP525

Sorry, I read your post wrong.

s2000ellier

I failed to say it clearly the first time, thank you for clearing it up in case others might have misunderstood as well.

dc50818

I dont think u will prob notice a difference

josserman

Actually talking with my buddy a pro race team tire guy, at at least my level he feels if be much faster on a 255 vs 275 as Id be able to get a 255 up to temps faster.

He's going to look at fitting a 255 on my 17x10 rims. Have to double heck but I don't think I saw an a/r 7 in 17x255. May look for some stock wheels and run 245..