Originally Posted by
onehundred80
Could be air leaking into the cooling system in the IC.
Let's say 10 psi coolant pressure one side of the IC cooler and 15 psi on the SC side. A small hole and the air passes into the coolant. No boost and the coolant passes into the air stream.
The only way to prove your theory is by testing, is there any way to force it into boost mode while sitting still?
You can attach a radiator pressure tester to the overflow tank and then raise the RPM's and force it into boost mode and watch the gauge.
Check the pressure before boost mode at high RPMs and then during boost mode at high RPM's, what do you think 180?