Originally Posted by gq_626

^^^A radiator most certainly will effect the temps you see under hot operating conditions^^^

The thermostat stays closed until 175 or 185 F, and then opens. Once the car is above that temp, then the themostat has no control over temps. The fans will kick in, and attempt to drop the temp back down, but under repeated dyno runs, or continuous boost operations, the the themostat is always open, and the fan is always running. When we dyno, coolants temps are always above 200 degrees...and as high as 226degrees. These high temps contribute to detonation, and high under hood temps as well. With a more efficient radiator, these temps will hopefully drop back down to 200 degrees or so...but again..the themostat is still open.