Track Day Best Practices - MUST READ

Sh0velMan · 06-03-2013, 08:13 PM

Quote:

Originally Posted by ChrisSlicks

The car's ideal water temp is right around the boiling point of 210F, the electric fan doesn't even kick on until 213F. Anything under 230F is fine, unfortunately it's pretty easy to get the water temp to 250F on track on a hot day with the stock radiator. Once you see it marching up just back off for a lap and the temp will come down fairly quickly. Big ass radiator is next on my list.

I saw power drop off (timing pulled) every time coolant got above 190f on the dyno.

I'm not saying 210 isn't fine, but I personally saw my car pull 2-3 degrees the second the coolant ticked over 190.

ChrisSlicks · 06-03-2013, 10:28 PM

Quote:

Originally Posted by Sh0velMan

I saw power drop off (timing pulled) every time coolant got above 190f on the dyno.

I'm not saying 210 isn't fine, but I personally saw my car pull 2-3 degrees the second the coolant ticked over 190.

I meant fine as far as safe, yes you are definitely going to lose power in hot conditions, in part because of the higher intake temperatures but high engine temps don't help either. Cooler is better overall, no doubt.

Sh0velMan · 06-03-2013, 10:32 PM

Quote:

Originally Posted by ChrisSlicks

I meant fine as far as safe, yes you are definitely going to lose power in hot conditions, in part because of the higher intake temperatures but high engine temps don't help either. Cooler is better overall, no doubt.

Oh for sure.

My experience has been that our engines will definitely back off the power purposely when temps get above an acceptable level. Part of the engineering dance to deliver the power level we have (which is easy to lose sight of... remember the venerable R34 GT-R or the Supra RZ? Yeah we make 50+ more HP than they did. Just think about that for a bit.) while maintaining reliability and hitting certain cost points (not having racing radiators and giant oil coolers from the factory, etc).

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