yeah, i know. it just makes you log in to that forum to access the info, so i took the liberty to sign up so i could just post here. it's a pet peeve of mine when you have to log into a forum to read something like that, so i just copy/pasted it for everyone else.
i have a BIC DDP, and love it. of course the ddp has function. yes, the pressure source for the wastegate actuator is taken from the cold side, however, when the diaphragm is introduced to 6.5psi (our stock pressure), it will begin to push the wastegate rod open, and in turn, opening the actual wastegate in the exhaust housing of the turbo.
there's benefit in the ddp because instead of the exhaust gas from the wastegate interrupting flow of the normal exhaust, which will have a siphon effect to it as it exits the turbine housing, it's routed down it's own pipe. the routing of the wastegate gas down it's own pipe creates LESS turbulance than if it just dumped in with the rest of the exhaust.
less turbulant exhaust= more power.
