So I installed my Seibon JS hood yesterday (thanks for the great deal and quick shipping Intense Motorsports ) as a measure to keep underhood temps down without having to change out my radiator for my upcoming turbo install.

My coolant temp while cruising seems to have gone down significantly. I think that with my OEM hood cruising temp was 195-198 degrees. But with the vented hood I'm down to 180-182 degrees.

So how cool is too cool?

 

I can't imagine there being such thing as "too cool". Considering that drag racers will put large blocks of ice on ther engine pre-racing, I think you'll be fine.

 

Don't sweat it. In fact, after your turbo install, you'll never ask this question again.

 

A guy in my car club actually switched his thermostat out with the nismo one, it gave him all sorts of problems presumably because the car was running too cool.