:tiphat:

Autocross, haven't made it to a track yet this year, it's been raining like a bast'ed. I suspect that on track my tire temps will reverse.

makes sense, chris...

tire pressure for racing...
 

I may be flamed for this response, and I accept it with great humility. Reason for humility: My 30-year old chick-boss told me that my knowledge is no longer applicable to current operations. I was born 20 years before she, and I have several Graduate School degrees more than she, and I know our business more than she, and she asks me, "What do I do, Greg?"...Yet I am bypassed for promotion. I digress! My useless/old info question is: racing Tire Pressures are, typically, higher than OEM recommended PSI. Why are you running only 36.5 (1.5 over stock)???? Call the tire manufacturer for racing PSI. R/S, Greg

Greg, thanks, and stop being bashful!... just say what you mean :)

I'm trying out different PSIs... yes, some guys run 40+ hot with their Hoosiers... my goal is to figure out which PSIs yield the best times - trial and error - that is all

Thank you, Travisjb, for the encouragement! I will attempt to post what I really think, but my greatest fear is being redlined/blocked from this post, and life in general. Always here for PM...at your service Greg :bowrofl: (this is the only "bow-down" html I could find)

I experimented a lot with tire pressure as well, with stock camber I was using 38.5 front, 35 rear, and after adjusting the camber I found that 36 front 34.5 rear was the ideal for maximum grip on my setup with RE-11's. Everyone will be a little different as it will vary depending on car setup, tires, and driver.

and of course maximum perceived grip is usually different than best time around track... hoosiers are known for this

perceived grip vs lap time...
 

You have stumbled upon the holy grail of racing! Michael shumacher was able to dismiss the feeling, so that he could lap faster than anyone (minus a few bumping mishaps).

yeah, what's up with Shumi today ? rain... malaysia... supposed to be his day! argh

So, the Ford truck is great, but alternator went bad... took the opp'n to put in 2 dry cell optima red tops... going to upgrade as things break... the trailer lights aren't working right either, but not sure there's an upgrade for those

Will post some pics of the trailer soon... it's 99% set up now and I'm starting to get into the routine of using it and loading / unloading... really pleased with the purchase

I carved out the rear license plate area today with a die cutter and sawz'all... then installed a black s/s wire mesh w/ snap rivets... looks okay - my fabrication work isn't as good as Junior's!

Will be at the Import Tuner event with Sharif this Saturday at Firebird Main - he'll be driving his GTR

This is really go to know.:tup:

Thanks for the insight. i just mounted 285/255 RE-11's and I wasn't sure what tire pressures would be optimal. One question, wouldn't it be better to have a stiffer rear tire side wall with higher PSI to avoid rolling?

Hey Travis, our GT-R crushed it's 4th gear two weekend's ago, and I had to scramble to find a new gearset. It doesn't look like the car will be ready for the Tuner Shootout. :( Still trying to secure a backup car, but it's not looking very promising at this point. It's a shame because we were looking to improve on our 3rd place podium finish from last year.

bah, who needs 4th gear ! lol

hope you get it sorted out !

That all depends on how your car is setup. From the factory you have slightly more rear camber than front camber, and the rear can be adjusted to around -2.0 with stock suspension. It's typically the front that rolls the tire edge the most during cornering, it's the heaviest part of the car and experiences the most loading.

The pressures I quoted are if you have after-market sway bars installed with adjustable front camber. With stock sway bars there will be more body roll and you will need slightly higher pressures to compensate.