mx6mike

Now that I finally have all my boost problems gone..........for good hopefully Now I have a new issue.BOOOOOOOOOOST creep damn it.The home depot controller just aint up to the job so its time for a real one.What would you reccomend?

911GT2

If you have boost creep, no controller will fix it. Creep is a result of the wastegate being too small to pass enough exhaust gas around the turbos to spin them slower. There are two answers for this, one is to add restriction to the exhaust, either via restrictor plates, or adding a cat. The other is to port the wastegate.

Creep only usually occurs with a full open exhaust, i.e. dp, mp, cat-back. And it's symptoms are steadily building boost pressure all the way to redline. What mods do you have?

UnSeeN

I believe everyone would say get a Profec B. As for the boost creep fix 911GT2 brought up. Isn't it if you set your boost controller to run stock boost levels the wastegate wont have a problem holding the boost?

And isn't it that if you are running higher than stock boost levels, then the waste gate won't be able to handle the flow of the extra boost. Thus you will experience boost creep in spite of the boost controller set to whatever boost correct? I could be wrong but this seems right to me.

911GT2

What the boost levels are does not matter in terms of creep, unless they are extremely high. The stock wastegate can only flow so much air, and if there is too much exhaust gas passing through the system then some of it that should go to the wastegate will end up spinning the turbos even faster.

Unless the boost levels are really high (can't say exactly what, but lets just say really high) the stock wastegate just can't flow enough. If the boost is set really high, then the flow of exhaust gas will spin the turbo up until the point that the wastegate will open, but the turbos would need so much exhaust flow that it wouldn't need to open farther than it can. (I don't even think I'm making sense to myself. I know what I'm trying to say, just can't really find the right words. Anyone else care to comment?)

bureau_c

You said it right 911GT2. Another way to say it, the LOWER you set the boost, the MORE the wastegate has to flow to hold it steady. Remember, any of the exhaust gasses not flowing through the wastegate are doing work spinning the turbine.

jds

Herblenny

iTrader: (13)

I agree.. i have a boost controller (AVC-R) with full exhaust.. and i have creep issue.. I been using the peak hold from the PFC and AVCR and both shows the creep.. Both are set at .85... I have hit 1.05 bars before.. I now have silencers for my N1 and it seems to help.. but I have other issues with my car..

UnSeeN

ahh it all makes sense now..thanks for clearing that up guys.

FDTuner

If you do get a boost controller, most agree the Profic b-spec is great. I run it and it’s simple and reliable.
I have no problems with creep, but I still have the shock cat on. My Blitz mid pipe won't go on until the single arrives.