[Duy]

So I just went to go get tuned. I have a 2007 sti. My mods are 38mm ewg, TBE, GMBS and fuel pump. It was a road tune. When we got on it in fourth we would get boost cut at about 5000 rpms. The duty cycle would just drop to 0. I checked all the connections and I didn't see anything wrong. My tuner thinks its that I have to strong of a spring in the waste gate but its only 1bar. I need help guys cus I really don't think the problem is that I need a .5bar spring. Thanks for your advice.

specVmatt

Maybe he mistakenly tuned your Cobalt?

schoellnasty

What is your target boost? Were you hitting that target at all before the wgdc hits 0?

blacksti

Did I rub off on you?

zenith

It's my car guys. It hit 22 psi and then cut. Target boost was 19

blacksti

Probably fuel cut

zenith

I doubt it cus my check engine light came on and it read something about the duty cycles.

specVmatt

lol.


Well whenever I hit fuel cut, it was when I overboosted around 3 psi over target boost and I would get a Wastegate CEL, I agree with it being fuel cut man.

schoellnasty

Fuel cut on a stock 07 ROM is set at 33.55psi absolute, so just under 19psi of boost. Your tuner needs to increase this value if he hasnt already.

I dont think you need a softer spring. Ive never heard of anyone boost creeping on a properly setup EWG, especially by 7psi over spring pressure. Hell I get creep on my 15psi actuator but only by a couple psi at 6K+. And this is on an internal gate too. My guess is that you either have a vacuum line hooked up wrong between the BCS, wastegate, and turbo, or there is a mechanical problem with the wastegate that is preventing it from opening fully.

zenith

OK well what would you guys do in this case cus it could be vaccum lines, a mechanical problem, or the tuning. Should I take it to a shop.