Originally Posted by metalCORE
@shainiac: What did you do to to avoid tht boost creep? As your sig says, you still driving the IWG version. Have you ported the wastegate or simply tried to re-tune the car better?
Would you say its necessary or better to go all 4" with the downpipe instead of 3.5"? I think more than 4" isn't possible in terms of space, and i have to keep the noise at an acceptable level, too.
I put a 2.5" steel restrictor in the exhaust. It helped some, but it was still higher than I'd prefer in higher gears for pump gas. I never changed the downpipe, but maybe a 3" one would have made a bigger difference. The problem I had with the spacer was that I kept blowing exhaust gaskets. I didn't want to port the turbo because it is a royal pain in the *** to remove. I ended up making a custom wrench just to get the turbo-manifold bolts tight. And to do that I still had to remove the IWG actuator which is also a pain. I also didn't want to port it because I paid good money to have the thing ceramic coated and didn't want to mess that up either.
For those of us that don't have access to E85, it kind of sucks to not be able to go wide open throttle on pump gas without risking engine damage. I had a water injection system that I trusted so I wasn't too bent out of shape about it. But if I'd bought the turbo with expectations of driving on the street at 15psi on pump gas and turning it up on race gas at the track, I would have been upset. That said, i loved the turbo and it was leaps and bounds more responsive than any rotary making similar power I've been in.