Boost Creep: Fix it, or make rest of car handle it?

[Enigma_Man]

I installed a 3" ghetto exhaust this last weekend, thanks sooo much to KPT4321! He welded all new hangars on the exhaust to make it sit right, and generally did most of the work (I'm a noob, and mechanically declined).

Anyway, I get some serious boost creep now, despite our efforts at porting the turbine / O2 housings. We took some good chunks of metal out of there, and I don't know if there's very much more that could be removed (It's a plain-jane 16G housing, and stock O2 housing).

I tried even hard-wiring the wastegate flapper fully open with safety wire, to see if it would stop somewhere. I managed 15+ pounds of boost and it was still going up pretty good, and started knocking, so shut 'er down.

My question to everybody is, do you think I should try and fix the boost creep by getting a different O2 housing, and/or porting the wastegate area more (or what other methods do you know of to fix?). Or should I just build up the rest of my car to deal with whatever boost it's going to end up with (I'm going to continue adding parts to the car anyway, so eventually I'll be running more pressure all the time).

I suppose my secondary question to this is then: does boost creep stop eventually? Like... if the wastegate is fully open will the boost eventually settle somewhere? Or if it creeps, does it creep forever? IE do I need to do _something_ about the creep?

Thanks, I think this is the appropriate forum for this also, but if not please move.

Thanks in advance, and feel free to contribute any points that I might've forgotten about that also need to be addressed.

-Jesse

 

[Spidey]

I'm in the same boat as you. If you look at previous threads, porting the wastegate passage after getting a 34mm flapper, the turbine outlet, and the o2 housing seem to be key at eliminating boost creep. However, I don't completely agree with this because my friend's 1g is having 0 issues with creep and his stuff is unported. It is puzzling.

 

[jamiesibley]

The creep will reach a point where it levels off. At a certain boost pressure, there is enough force on the compressor wheel that it causes your exh. manifold pressure to rise high enough to force the required amount of exhaust past the flapper. But, that could be at 16, 26, or 36 psi depending on your turbo and other stuff. Even a stuck closed wastegate will stop boosting... at some point.. 60+psi. A 16g o2 housing would help the situation though. Its a fairly cheap second step.

 

[92tsifwd]

Boost creep can blow motors, trust me, I would keep your foot off the gas until you adress the problem. Cheapest method is porting your turbine housing and o2, if that is fully ported than a o2 with external dump. If you still creep then external wg is only way to go.

 

[heavypedalmuzic]

i'm about to change to apexi 3" Dp/exhaust and no cat and am worried about creep. from my research getting a tubular 2.5" 02 housing, port the wastegate hole out and use a 34mm flapper should solve the prob. this method has help many but not all. its worth a try. if it doesn't work go for ext. wastegate.
let us know what u ended up doin and the results!!