Anyone know if there is any real difference between the two valves with respect to running them on a Z20LET engine?
I know everyone quotes the Bailey dump valve for Vauxhalls, and the Collins for Fords, VWs etc, and I'm running a Bailey valve with the OE valve deactivated on my turbo coupe. It only appears to vent however when the car is really booted, and there's not much chance of that on my journey to work!
A GSi I know running the same standard boost but with a Collins fitted seems to vent noisily like its running 20psi, every time the throttle is lifted even at low revs.
Therefore since a dump valve is protecting the turbo stalling etc by venting excess pressure, is the Collins better for the turbo than the Bailey?