Thread: Autocross!
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      07-12-2017, 02:48 PM   #84
SkysTheLimit
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Drives: '04 E46 M3 Coupe
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Quote:
Originally Posted by omasou View Post
At last month's ax I noticed a few folks spraying water on their tires between runs to help cool them down. Does this really work?

When looking at the TPMS info my tires only increased in pressure from 35 to 37 and most were ~97°F, the left front was the hottest at 113°F.
I'm one of the sprayers;

I do codrive the cars and would notice rapidly decreasing amounts of grip/increased wear when running the tires overheated. It all depends on your driving style, braking zones, course surface, ambient temperature, and elapsed time between runs...there are many variables.

There's not much loss to trying it if you think it will help. Pick up a $5 sprayer from Walmart and bring it along next event.

If you are spraying to cool and the tires do not need it, then you would be decreasing the temperature to the point where the tires need to warm again - which would be counterproductive. AX tires have an optimal temperature point where they are stickiest.
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