[s-cars] Bypass Valves and Pressure Losses (Uh, Pizzo??)

[CaptMagu at aol.com]

Gary

I have the H34 TurboXS right now. Do you have it plumbed from the side? In 
other words is the pressure feed from the turbo plumbed into the side of the 
piston. If not you'll want to reorient it this way and then you won't need any 
washers. In fact I went to a softer/shorter spring. I had shimmed my old H34 
like crazy, well beyond the provided washers and was still having a problem 
getting it to hold boost. I talked directly to the TurboXS folks a while back when 
there was a thread running on mounting BPVs backwards. They admitted that for 
high hp applications that this was the way to go and sent me a brand new H34 
configured for a hard mount at the side. Tha's what I have now but even with 
the softer/shorter spring I'm still getting that boost surge at throttle lift 
from boosted runs. It was Trevor Frank's idea to try a softer spring and it has 
greatly improved the problem but has not totally fixed it. My next try is a 
beefier diaphram unit. The stock Mitsu EVO BPV couldn't hold my turbo's force.

Hap, boostin and surgin in Everboost, Maguire