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can anyone racing a 2ZZ powered car give me some factual data on their water coolant temps. ??. my dyno work tells me they like running hotter than colder and possibly as high as 94C/200F. i have been racing 2ZZ's for ages and never seem to have any problem with occasional temps up to 105C/220F. There are unsupported claims the Lotus ECU starts retarding timing at 90C/194F, whereas the Toyota ones do not. thanks
 

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can anyone racing a 2ZZ powered car give me some factual data on their water coolant temps. ??. my dyno work tells me they like running hotter than colder and possibly as high as 94C/200F. i have been racing 2ZZ's for ages and never seem to have any problem with occasional temps up to 105C/220F. There are unsupported claims the Lotus ECU starts retarding timing at 90C/194F, whereas the Toyota ones do not. thanks
My 2-11 runs water temps during races (ambient temps of 90-95*F) of ~ 185*F with no radiator air restriction. We have done work to make the cooling system as efficient as possible, as we are using a laminova water/oil cooler. On cooler days (60-80*F), I need to use blanking plates to restrict air flow to the radiator to achieve my desired water temps.

I have had my car on the dyno but never experimented with running higher coolant temps to see how RWHP is affected.

It is also my understanding that the stock Lotus ECU calibration will begin to reduce timing at certain water temps, not sure it begins doing so as early as 194F.

Same phenomenon applies as IATs increase with the S/C cars .... I've been told that the stock Lotus calibration begins pulling timing as early as 86F .... 1 degree at 86, 2 at 104F, 3 at 122F, finally maxing out with 6 degrees of timing retard at 158F.
 

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I never see temps over 205 or so if my cooling system is working right, Higher then that has meant there is a bubble somewhere, or more recently that I was using a poor aftermarket water pump. Stick with the composite bladed OEM ones if you have swapped. Ambient conditions are often over 100F FYI
 
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