Tire pressure on the track | FerrariChat

Tire pressure on the track

Discussion in 'Technical Q&A' started by CarlII, Sep 17, 2016.

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  1. CarlII

    CarlII Rookie

    Apr 6, 2016
    19
    Cincinnati
    Full Name:
    Carl Rich
    #1 CarlII, Sep 17, 2016
    Last edited by a moderator: Sep 7, 2017
    Going to a driver's Ed tomorrow at Putnam park with my 430. The manual calls for 37psi rear and 34 front for my Bridgestone while the door jamb panel days 32 psi all around. Anyone have knowledge here for best psi on track?
    RLI seems to have most reasonable track insurance I could find. Thoughts?
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  2. 24000rpm

    24000rpm F1 Rookie

    I have a 360 challenge. with 18" wheels. sometimes with porsche cup2 slick , sometimes with others.

    In my opinion your, which could be wrong, since I am a novice myself: the pressure you put there was way too high. The manual is for street use I suppose.

    On racetrack, the target pressure is about 2.0 bar, which is about 29 psi, and this is after tire is warm.
    When cold i put somewhere around 1.6 bar, depending on the track temperature. when very hot, I could put 1.4 bar in there.

    Again what I said maybe wrong, but it shouldn't be too far from the ideal setup the pros are doing


    It is better to ask this in the racing section of fchat

     
  3. bisel

    bisel Formula 3
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    Sep 12, 2012
    1,138
    Scottsdale, Arizona
    Full Name:
    Steve Bisel
    The goal of having correct tire pressure is to maximize the contact patch. Too much pressure places too much weight on the center portion of the tire. Too little on the outer portions. Both will reduce the contact patch and compromise handling.

    I had one pro give some seat of the pants advice that if you examine the scrubbing marks on the outer edge of your tires after a few runs you want to see some scrubbing at about the 45deg point on the outer edges of the tires. If scrubbing marks roll over too far onto sidewall the pressure is too low. This is indication of your tires flexing too much and you are scrubbing off speed in the corners. If there is little to no scrubbing marks the pressure is too high (or you are driving too slow).

    The above tip is only a visual indicator and is much too simplistic to be a definitive answer. There are too many other variables that have to be taken into account. The best advice if you really want to know the correct tire pressure for tracking is to start with a bit lower than recommended pressure. But before that, educate yourself on the effect that varying the pressure will have. Lastly, you should have the proper tools for measuring and evaluating the correct pressure.

    Here is a reasonably good link to read ...

    TurnFast! Race Driving Techniques for Heel Toe Downshift, Driving Line, Cornering, Braking, and More ? Tire Pressure 1

    Steve
     

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