Boost Problem

[andy panda]

Hey guys,

So i've got an r33 series 2 gts-t and i dont know if it's the boost solenoid or not but it only seems to be getting 6 psi thru the whole rev range. If i sit it on half throttle up to 4.5k rpm it sits on 5psi, then full throttle it's 6, but then doesnt change at 4.5k rpm like it should. The only mods on it at the moment is an r34 side mount and a 3" exhaust from the turbo up to the rear muffler which is a 2.5" pipe and a crap muffler to pass EPA which i havent replaced yet. Im just wondering if it's possible that the exhaust is putting too much back pressure through the exhaust that the ECU is cutting off the stage 2 of the boost solenoid? Or would it be more likely that my boost solenoid is broken... I think i read something about one of the hoses coming off it saying it had a restrictor in it, could this possible be why it's not doing it's job?

Before i had to take everything off it was dyno'd and ran 7psi then 9psi at 4.5k rpm so i dont know whats gone wrong with taking stuff off..

[lachlanw]

if all youve changed is thr muffler then thatll be it . if its real restrictave and quiet it will do that

[andy panda]

well thats a bit gay then lol guess its time to get a better rear muffler then, the nur spec 1 was too loud for my liking anyways..