A blow off valve is to bleed air from the compressor spike when you slam the throttle body shut. It's supposed to stop you from damaging your turbo. However, in talking with people who build turbos and have been in the industry for a very long time, it's their feelings that the blow off valves available to people like us don't really serve that purpose because they react too slow.
I think that the real reason people want them is for the improved throttle response between shifts. The idea is that with a blow off valve your turbo is free to spool with the throttle closed and you have your boost availabe when you let out the clutch. Kinda like toyota's cool bang-bang system :)
Jeremy _____________________________________________________________________________________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com ---------------------------------------------------------------------------- To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes) in the body of a message (not the subject) to majordomo@lists.diy-efi.org