Quote Originally Posted by TheRealKoop View Post
Ive never seen an application on any car that opened the bypass once the turbo was spooled. Most of the time people just cram the air through the rotors, as spinning rotors are less restrictive then your dime sized bypass valve. Its a good idea though. But running a small pulley then opening the valve would still cause alot of parasitic loss from spinning the blower so fast.
I would probably just run a large pulley like a 3.4(4 psi) or 3.2(6psi), depending on how much lowend grunt i wanted, and then turn the turbo up accordingly.
I would say the electronics the are used on a twin chared set up would have to read a certain amout of boost pressure before the blower from the turbo and then open up the bypass valve. Once they bypass is open, the air will flow down there and some past the rotors as well. Once the bypass is open, the S/C will no longer be making boost, it should just be generated from the turbo and the s/c should be acting like a pump.