BoostValve, ALH TDI 1999.5-2003

1 customer review


mk4, gl, gls, 1.9, 1.9l, ve, alh, boost valve

SKU: VNTTDI-G2-BV Categories: , Tags: , ,


Manual boost control valve that prevents boost pressure from opening the turbo’s waste gate until the desired preset boost level is reached.

The Boostvalve turbo boost controller is an adjustable pressure relief valve or “check valve”. Some may call this a “gated valve.” This is not to be confused with a “bleeder valve.”

This custom kit includes proper boost range high pressure springs (16+ PSI and 25+ PSI). No vent hole drilled in valve body (other kits, including universal will have a vent that must be blocked). Eliminates low RPM over boost problems and surge.

Fits the Following:
1999.5-2003 VW Golf 1.9L TDI
1999.5-2003 VW Jetta 1.9L TDI

Note on Functionality: Inside the valve is a precision stainless steel ball that is held in place by spring tension. During the turbo’s spool-up (as pressure is building) spring tension in the valve is greater than the boost pressure pushing against the ball, so the ball prevents the air from flowing to the wastegate actuator.This maximizes the efficiency of the turbo during the spool-up by using the greatest amount of air possible to spin the turbo charger. Most boost control systems waste air by venting much of the air out, even many factory boost control systems waste available exhaust energy during this crucial spool-up period. Once the turbo spools up to the desired boost, the Boostvalve opens, quickly opening the waste gate. Boost pressure is held at this level with accuracy unmatched by even more expensive methods of boost control.

Additional information

Weight .5 lbs
Dimensions 5 × 3 × 2 in

Based on 1 review
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  1. Cardoc126 (verified owner)

    Game Changer!!! I’ve been fighting Overboost limp mode on my 2002 tdi tried everything and couldn’t find the problem nor could VW. I stumbled onto manual boost controllers and after thorough research decided this is the one I wanted. Simple installation and so far no Limp Mode!
    I have had a few questions which I email Boostvalve directly and they have been very quick to respond and gone out of their way to help. They are sending me out a weaker spring for the boost controller so I can reduce my boost even further. Did I mention EXCELLENT CUSTOMER SERVICE!
    Thanks Cascade and Boostvalve for helping me tame my beast!

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