Not much is ever mentioned about this mod and I wanted to know who here has done it and what the result was. The best thread about this mod is over at nasioc: here and it has briefly been mentioned on this forum here and here
In theory this mod stops/reduces/moves the wastegate opening that occurs at low boost (around 1-3psi) with aftermarket exhausts.
A theory of why this happens is explained best by cuda:Thoughts?Originally posted by Cuda
I'm pretty sure what's happening is that the wastegate is set to a specified setting, when you change the exhaust, mainly the uppipe and downpipe, you change the backpressure in the system causing the wastegate to not open correctly. Adjusting it tightens it up causing the wastegate to stay shut. Also, seems that bellmouths have the most problem with it. I've helped a few local people with this and every car is different and takes a different amount of turn in. Glad to hear it worked. I know just how annoying it can be!! It will also give you abit better boost response.