View Single Post
911st 911st is offline
Registered User
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Again, the purpose of the deverter and the throtle bypass to a lesser degree is to vent pressure between shifts and on throttle lift.

With the aftermarket bypass's you typically hear a faint "woosh" sound with the valve working correctly. No woosh, no workie!

Also, if with a quick shift you do not come instantly back to full boost the valve is not working. If it is not back to full boost instanly and it takes a sececond to build boost back up from say .5 bar between shifts it is not working properly.

If you are running a C2 turbo black plastic Bosch bypass, they often fail.

On my car I had no loss of boost with sport style shifts once my system was dialed in.
Old 10-21-2009, 07:37 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)