Bhamsan said:
what about running stock BPV on the Turbo to IC pipe, and BOV on IC to TB pipe? Any problems?
No problems at all, but I think my setup is the best for this reason:
My stock BPV (on the IC -> TB pipe) is recirculating, the GReddy BOV (on the turbo -> IC pipe) is venting.
When you get off the gas and the throttle plate closes, the air hits the plate, and starts heading backwards towards the IC.
Most of the air gets recirculated back into the intake via the stock BPV, because it's 'first in line'.
The rest of the air (the air that would cause turkey/surge on the stock setup) gets vented into the atmosphere via the GReddy Type-S BOV.
Running the GReddy alone, venting, I can feel a drop in power when shifting due to the overly rich mixture caused by venting to the atmophere. With my setup, I don't feel any bogging down between shifts at all, because a lot of the air is being recirculated.
The only flaw is that if I shift at low RPMs (< 3000), or after building very little boost (< 3 psi or so), I get a bit of turkey/surge. But other than that, it's all GReddy whistle.