It's been an aiful long time ince I drove on street tires... so I do not remember what tire pressures I used to run...
I use DOT R comps (Kuhmo V710's now) and generally run 30 or so in the front and 26-30 in the rear depending on temps/sun vs shade, ect. I think I am going to try a set of Hoosier A6's next season though so it will be yet another learning curve.
Typically lower pressures yield more grip with more "roll over" and higher pressures reduce "roll over" but yield less grip. You need to find a balance between the two to become competative. keep in mind that while lower pressures yield more grip, this only occurs until you start to "roll over" the tires and grip is lost due to loss of available contact patch.
I agree with the above statements of look to the driver first because rookie drivers commonly overdrive the cars... but I disagree with higher front pressures reducing under steer.
understeer = turn wheel, car plows through turns (or tries to go straight)
oversteer = turn wheel, car rear end tries to come around (or fish tails)
slight oversteer is where I like my car... every driver is going to like a car setup to be slightly different.
another common rookie mistake is that when the car starts to understeer, drivers tend to turn the wheel even more to try to compensate for the car not responding to the driver input. unfortunately this action simply makes the correction harder to accomplish once the car slows and grip is regained... the proper action to take if the car understeers is to straighten the wheels and attempt to make the turn again.
Tip to remember: Your tires only have 100% to give... If you are sliding or spinning your tires, you are asking more than 100% from them. further more if you are at the edge of traction limits in braking and then you turn the wheel, either you are going to lock up the tires or you are going to under steer because if you are asking 90% from your tires in braking and then ask another 50% in turning your are asking 140% from them and it will not happen.
I'm gonna stop there because I know it is a lot to digest, but keep digging and you will get it.
BTW, I like the advice about using chalk to measure tred wear... the moment I started doing it I improved a lot because I was able to better understand what was happening to my tires when I drove.
MY LUGNUTS REQUIRE MORE TORQUE THAN YOUR HONDA MAKES
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Last edited by SCCA_Stang; 10-07-2010 at 01:14 AM.