Quote:
Originally Posted by TMF
Great blog posts on tire pressures from our local alien:
Part 1: http://www.conecoach.com/2015/03/11/...he-sweet-spot/
Part 2: http://www.conecoach.com/2015/03/24/...ire-pressures/
For me, I use the chalk method and get the "hot" pressures to allow the tires to roll right to the top of the triangle. Then I tune the car balance with the Koni's, and my driving. In cooler temps, I've learned dropping 1-2 psi all around can make a huge difference.
I don't mind sharing my pressures/setup:
-225/45-17 RE-71R's, 33 front (hot), 30 rear (cold). Sometimes 34/31 on warmer days.
-TRD sways, springs
-OTS Koni's, half turn from full stiff front, half turn from full soft rear. Sometimes full soft in the rear if it's cooler or I'm trying to calm down the rear end or if I'm still getting a lot of oversteer on corner exit.
-this is on asphalt, but I used the same settings down at Lincoln.
-FWIW, I usually win my class locally and am better than top 20 overall out of ~140. Not to brag, but I got my first top 10 finish locally at the last event  Can't wait for next season! |
Interesting links. Thanks for sharing. Personally I run 225/45ZR17 RE-71R's at 29 front/27 rear. OEM sways & TRD lowering springs.
One thing that those links don't mention that I've found is really helpful is tracking your tire pressure/temperature increase per wheel each run and then modifying your pressure to get the ideal contact patch at the point in the course where you most need it. If I'm on a course where the last two critical turns are hard rights then I'll drop my pressure lower on the front left tire before the run so that I'm closer to ideal pressure when I reach that point of the course.
I've actually never used chalk. Next year I may give it a try but the triangles have been sufficient enough and with the Bridgestones it's been fairly easy to tell where the new tire wear is vs. the old. I do track my temps with a pyrometer on outside, center, and inside tread though.