I have a problem with my dumpvalve. The car is a calibra turbo 4x4. Phase 1 tuned. ( overboost 1.2 bar normal 0.9 bar )
The dumpvalve doesn't open when idling or when releasing the throttle. (car standing still and then stepping on the throttle).
The original dumpvalve has been blocked of by a "one way" valve. The new dumpvalve is conntected by a t-piece into the line coming from throttle body to original dump valve.
Is it possible that the spring in the dumpvalve is to strong? The vacuum line is not sucking hard so could it be that the original diameter is to smal?