adrenalinecrisis Posted June 10, 2017 Share Posted June 10, 2017 PROBLEM SOLVED!!! The Supertrapp muffler I had on my dump tube was causing enought restriciton to cause the overboost. Hey everybody, First off, I drive a 05 Legacy GT with the factory intake, BNR 16G, Invidia catted downpipe, and a Greddy catback. Stock Injectors. I'm in the process of getting tuned and i'm having problems with overboosting. Right before I started tuning I installed a grimmspeed EWG up pipe, Turbosmart Compgate 40 EWG (7psi Spring), grimmspeed EBCS, and a adjustable grimmspeed wastegate bracket to keep the factory turbos wastegate closed (BNR16G). I have the vacuum line setup exactly like grimmspeed recommends. Port 1 going to turbo inlet pipe, port 2 going to lower wastegate port, port 3 going to the turbo nipple, and the upper wastegate port venting to atmosphere. I was overboosting up to 22psi and hitting fuel cut with this setup. I then tried running wastegate spring pressure by running a line straight from the turbo to the lower wastegate port, but I was able to hit 13 psi (I could have easily hit more, just stopped there) without the EWG opening. When I installed the EWG I made sure that the valve seat was installed, and I could compress the spring with my finger. So it was able to move during install. But I had to compress the spring with the valve seat into the EWG maybe an 1/8" in order for me to get the V-Band clamp on. Is that normal? Why is it not opening? When getting into boost, I do hear boost being vented somewhere, but too hard to tell where. All my AF Learning parameter are within 3 so I don't think I have a boost / vacuum leak somewhere. Can anybody help figure out why I am overboosting? Thanks. Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.