16G in, creeps like crazy

markGSX · Jun 18, 2003

Back with my old setup, stock 14B and a 3" RNR turbo-back exhaust I ran 15 psi with no creep at all. Then the 14B died so I slapped on a ported small 16G with the 34mm flapper mod, a ported 2G O2 housing, and a ported 2G manifold. Since then I cannot control my boost if my life depended on it. I kept adjusting my Hallman MBC to no avail. Whatever I would set it at it would creep very quickly up to 20+ PSI. This is very bad since I'm still on the stock injectors. I talked to Tom Stangl and he advised me to remove the boost controller completely, and connect the tap from the BOV line directly to the wastegate on the 16G. I did that, but it's the same story. I REALLY don't want to go external WG, and I shouldn't have to with a small 16G. What can I do?

MindBlowin03 · Jun 18, 2003

I would guess its the 3" turbo-back doing that. Im pretty sure 2.5" is plenty for a 14B or even a 16G setup. If you want to stay with the 3", you may have to go external.

Turbo Lag · Jun 19, 2003

Originally posted by MindBlowin03
I would guess its the 3" turbo-back doing that. Im pretty sure 2.5" is plenty for a 14B or even a 16G setup. If you want to stay with the 3", you may have to go external.

I have a 14b 3" exhaust and a 3"gm maf and do not see creep like that (though if I try to run under 13 psi it creeps to about 15psi) . It's either a controller setup problem or the wastegate needs ported more. Any boost creep issue is most commonly related to the wastegate not flowing enough.

markGSX · Mar 7, 2004

I'm bringing back this old thread to say that nearly a year later, I fixed the creep!

I had a 3" cat welded onto my RNR downpipe and all signs of creep are gone. Not a high flow cat, just a regular $50 Catco 3" cat (though anything 3" is probably high flowing).

Before cat: creeps well past 20 PSI
After cat: rock solid @ 16 psi

Plus my car smells much better, and the brown stain above the exhaust tip is gone. I do not notice any performance hit, so I wish I'd have put on a cat sooner. :thumb:

In fact, performance is actually better now because I was able to get some rough tuning in. Before, I had to run extra rich to be safe with the insane creep.

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16G in, creeps like crazy

markGSX

MindBlowin03

Turbo Lag

markGSX

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