APS Complete or APS Lite ?
in 4th gear 
Pro
Joined: Jun 2003
Posts: 555
Likes: 0
From: Moline IL
Unless your car is a diesel (no throttle body), you will want a BOV!The purpose of a BOV is to prevent compressor surge when you close the throttle body. Without a BOV, the pressure that is built between the compressor discharge and the throttle body has no place to go when you close the throttle. As a result pressure goes backwards to the compressor. This is EXTREMELY hard on turbos and if done for a sustained time can fail turbos in minutes (well, journal bearing turbos, anyway... I can't speak for the ball bearing ones. If the claims are true, they should hold up much better to compressor surge). The BOV takes the compressed air trapped between the throttle body and compressor discharge and discharges it either to atmosphere or back to the compressor inlet.
The APS kit has BOVs similar to those that you would find on a production car. The TTi kit has an aftermarket "high flow" BOV (used to be dual BOVs, now they went to a single).
Hope that clears some things up a bit...
Le Mans Master
Joined: Apr 2001
Posts: 5,473
Likes: 717
From: Black Forest CO
Brian,
Are the Hyperboost HS still available for $300 shipped? I would like a pair for my APS.
Are the Hyperboost HS still available for $300 shipped? I would like a pair for my APS.
I have great replacement DV's for the Bosch's by way of Hyperboost HX Stealth. They react much faster and have no rubber parts to fail unlike the Bosch series. HX Valves will handle more boost than you could throw at it for the C5/6's etc... Usually they are 169 each but since pairs are needed I will do them for 300 shipped for CF Members. Plenty in stock ready to go.
Here is some more info, the latest valve now looks exactly like the Bosch and is so close it fools Audi/VW dealer techs all the time. I would have to say I sell about 15 of these a week +/- of course.
Hyperboost
Brian
Here is some more info, the latest valve now looks exactly like the Bosch and is so close it fools Audi/VW dealer techs all the time. I would have to say I sell about 15 of these a week +/- of course.
Hyperboost
Brian
