I am I correct to assume that hooting noises are due to compressor surge? My stock bypass valve started hooting a few weeks ago and I recently replaced with an ebay BOV. It's a simple jobbie with an aluminum body and a brass plunger, however the spring is extremely stiff. At WOT, the pressure behind the plunger and the pressure in front of it should be equal, right? In that case, it shouldn't take more than a pound or two of spring pressure to maintain boost. I estimate the spring to take 15lbs or more.
The car hoots when take off at WOT and then level off acceleration. The vacuum behind the plunger doesn't seem to be enough to overcome the spring pressure so it doesn't blow off. I expect some boost leakage at partial throttle, which is not an issue as it shouldn't leak at full throttle. Should I try cutting the spring?
The car hoots when take off at WOT and then level off acceleration. The vacuum behind the plunger doesn't seem to be enough to overcome the spring pressure so it doesn't blow off. I expect some boost leakage at partial throttle, which is not an issue as it shouldn't leak at full throttle. Should I try cutting the spring?