QUOTE(rhodyguy @ Aug 25 2003, 09:18 AM)
have any suggestions where i might start. has stock f&R bars, and koni reds set on the softest stop.
if you're asking for recommendations on tire pressures, i suggest starting at the Max Cold Inflation Pressure molded on the side of the tires. if you find this is too harsh and twitchy, drop a little air between runs - probably not more than 1 psi at a time.
use some white liquid shoe polish so you can see how much of the sidewall you're using. if you see that you're just wearing a teeny narrow band in the center if the tire, drop pressure. if your tires are rolling right up into the sidewall, you need more air.
it is -always- easier to start with too much and bleed down to a lower number than to keep track of a air tank - this is hard enough for a two-driver car or one with a crew - if you don't have lots of helpers, i wouldn't even try...
you might (this is a very rough number mentioned to me by a Pirelli engineer a long time) expect to see pressure go up 10 per cent cold->hot. if you don't see a 10% increase, bleed some out. if they go up more than 10%, add air.
starting with MCIF and then bleeding down to that at the end of every run watching your shoe polish marker for when you're real close is as good a starting point as i've found. you may discover you need more than MCIF to prevent the tires rolling over.
obvious point: make sure your tire guage is in reasonable calibration. i got myself pretty lost at the (re-)start of my AX career on racing tires when i couldn't understand why i was using 40+ psi when everybody else was using 30 or less. turns out my old once-reliable tire guage was 10 psi off! it hit the dumpster and i got a new digital gage from Radio Shack for not a lot of money.