Boost Creep (I did my research first)

[HiImBrian]

First I want to say, I did do quite a bit of research about this before I decided to post this thread. So I realized yesterday that my gsx is experiencing boost creep. I know this because my boost guage hits about 11 psi then pauses and climbes fast to 16ish. So after about 5 mins of this I came to the conclusion that I had boost creep. I know that boost creep is caused by a few things: restrictive exhaust that would cause backpressure, and I've heard some stuff about the wastegate, I've also heard about the manual boost controller causing it.

My manual boost controller seems kind of sketchy (came with the car) but it was working fine before? I know it can't be my exhaust-I have a custom straight 3'' exhaust w/ almost no restriction at all. And as far as the wastegate-I'm not really sure.

I'm hoping that a new manual boost controller will fix this problem. Any other suggestions???

[TheBlizzard]

Actually your kind of backwards. Boost creep is a result of very free flowing exhaust the lets boost build very quickly and as a result the wastegate cannot bleed of the boost quick enough and the boost will climb. This is very common on a intenally gated turbo running a full 3" exhaust or bigger, especially if you have a O2 eliminator downpipe.

For example, my Laser had a full 3" exhaust w/ O2 eliminator downpipe. The boost would climb to about 18lbs if it was above like 50 degrees or so. The colder it got the worse it got, in the winter if I stayed on it in 3rd, the boost would climb to around 24lbs.

After porting the wastegate it was better but would still creep when it was really cold. We got it to stay steady at 14psi when it was above 50 degrees.

So I would port your wastegate or go external. I wouldn't think it would be your boost controller unless its sticking or something. You would try a different one though.

[HiImBrian]

Why would this all of a sudden happen? It worked fine befoer I swapped turbos. I went from a big16g to a ported/polished big 16g. could that be why?

[Shane@DBPerformance]

Yes.

[TheBlizzard]

Originally Posted by Mr.98GSX

Why would this all of a sudden happen? It worked fine befoer I swapped turbos. I went from a big16g to a ported/polished big 16g. could that be why?

Like I said. If you are flowing so much air that the wastegate cannot bleed it off fast enough its going to creep in the higher RPMs. Take off the turbo and port the wastegate or have it done. Either that or go external.

[HiImBrian]

I know external is better, but dont a need a new exhaust mani?

[TheBlizzard]

Just take the turbo back off and get the wastegate ported some and it should be fine.