Originally posted by DemonSVT:
For every 10 degrees cooler the engine runs it requires 1 less octane point. (I.E. more boost, timing, etc per octane from pump gas)

You wonder why I could run my race program until the mean heat of summer... Well besides good tuning

Even now I switch to it if I'm driving at night.

What difference is that on a stock or mail order chip car. Not much if any.

For ref
Stock t-stat starts to open at 190-192.
Stock fans are 216/224.





BTW, Tom, thanks for the corrective and informational post. Who needs a car forum when they have friends like you?

Okay so let me get this straight. Right now my SCT tune and program has my main cooling fan coming on at 200F, and shutting off at 180F. I will need a 180F thermostat in order for the dF to be compliant both from the fan and the thermostat in synchro correct? Stock is 192/195 at Autozone, and the Mustang one I have in the box here is 160f, but they also provide a 180f one as well. 3 Choices, and I need to pick one by Friday. Thanks guys...

XL