Originally Posted by gernby,Feb 11 2011, 06:57 AM

There's definitely an optimal mix of coolant temp, ignition timing, and AFR that's going to give best power without predetonation. If you go too hot on coolant, too advanced on timing, or too lean on fuel, things go south quickly. However, running a low coolant temp is going to reduce power similarly to retarding timing or running rich.

I'm not going to try guessing how much power you loose by running 10 degree colder coolant. All I know is that I'm getting awesome results from my setup with coolant temps in the high 190's. My coolant temp was 205 F for the dynojet run that I've posted so many times from the S2000 club dyno day.

Originally Posted by H22toF20,Feb 11 2011, 04:58 PM

I'm not saying your wrong. The author of the book that info is from, is an OEM calibrator and aftermarket on the side. I assume he know's his shit.