I just bought some Kumho V700 victoracers for my s2k (225/245). Needing to know the optimal PSI for autocross... maybe 35/32 ???

 

Come out to our autocross at Mineral Wells tomorrow and you'll have six different people running R-compounds to talk to.

It's more of a function of surface and conditions than an ideal number. It's an art, not a science. Go ahead and try those numbers and adjust them until the car feels right.

 

Wont be able to make it to Mineral Wells, but will be at Pennington on Sunday for my first run on these Kumhos. Hoping to shave 1 second per 20 seconds off my time. Think its possible ??

 

I run on Pennington field frequently with Khumos, with my suspension set up, I run 30 rear and 32-34 front (HOT PSI), the variance in the front is due to whether I am getting understeer or oversteer feed back.

Check my times at pennington field with the scca and er sites, SM2 #91.

 

reducing your time 1 second for every 20 seconds is possible considering Pfield is a 40-50 second course depending upon layout. I have dropped my times 4+ seconds throughout 4 runs many times.

run number 1 will be a tire warmer and run 2 will be faster, stablizing tire pressure here after, in order to maintain the objective PSI through the run is the key. So otherwards when you get back from your run your tires should be at the hot PSI level that was targeted. Your tire pressure at the end of the run is important, because you will learn to adjust before the run in order to obtain the PSI you would like to exit the course on. I hope that makes sense.

I will be at TMS on Sunday, I am skipping the event, but I will catch the rest of the year with SCCA.