i have a problem with my dump valve since fitting some new parts, it doesnt dump fully you get a small amount of dump but not alot and along with that you get a boost spike up to 0.9 to 1 bar and chatters also. here is the spec: front mount intercooler airfilter relocation j's manifold and decat hks actuator blitz ss bump valve std exhaust(waiting on new one) the boost is currently set for 0.8 bar maybe to close to fuel cut, i have tryed to clean the dump valve vac hose at both ends and lubed up the inner part of the valve i have checked all the intercooler pipework for leaks and still nothing, i have also tryed to bring the boost down a bit so that it isnt as close to the fuel cut but it still does the same thing. any one know what it could be or other things for me to try?
