Quote:
Originally Posted by strat61caster
As to the importance of pressures vs temps, in the HPDE/amateur sphere, 1-2 psi isn't a game changer vs. tire temps directing alignment, suspension, and driving changes which can have a bigger impact (both positive and negative). NASCAR and F1 already have the other settings dialed in to a high level of refinement, the driving is so skilled that those 1/4 and 1/2 pound air pressure changes can be valuable consistent hundredths or even tenths of a second per lap.
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It's a less a question of skill - I'm not a pro, but on certain tires I can detect a change in the balance of the car caused by 1-2psi - and more one of magnitude. Your average street tire is going to want pressures in the 30-45psi range, vs. true slicks which want their pressures around 20psi or sometimes even lower. Longacre will sell you 0-60, 0-30, and even 0-15psi gauges as a result.
When pressure is lower, 0.5psi is suddenly a much larger adjustment in terms of percentage. If you had some hypothetical tire that was inflated to 1psi and you adjusted by 0.5 psi, that's a massive 50% change.