Gearbanger 101 said:On plain old radials......I wouldn't bother lowering it much at all. Lowering the tire pressure on a street radial causes the tire to buckle in the middle and reduces the contact patch on the pavement, which is what you don't want.
On (bias ply) slicks or drag radials, the tire casing is designed differently and made from a different rubber compound. In this case, reducing air pressure will allow them to wrinkle on the side-wall, while still maintaining an optimum contact patch with the pavement......but it doesn't work on stock tires.
I’ve never, ever in all my years at the track, seen anyone consistently improve their 60ft time by varying from the stock tire pressure on street tires.
No worries.PULMEOVR said:I dunno, I mostly just give advice on track stuff about what I hear works from different people. I've never been to the track my self (yet), so I can't really say what actually works for me.
Gearbanger 101 said:No worries.This was an old trick carried over from the era when all tires were bias ply.....it worked great back then, but with todays street radials, that are built with more rigid and durable casing, the same advice doesn’t hold true. Most people that still do it at the track are doing so out of either inexperience, because they read it in an old issue of hot rod, or their friends, friend heard from their father that it was a good advice. Just to clear up any further misconception…..it is not good advice. It’s a sure fire way to poor and inconsistent 60ft times.
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