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####ing Boost Creep

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crashed97tsi

20+ Year Contributor
828
0
Apr 21, 2002
Bethlehem, Pennsylvania
Alright guys, I need some help here. I tried almost everything but I still can't get rid of it.

Ok first off, The creep started when I installed my Apexi GT downpipe (2 1/2, maybe a little less) and RSR exhaust (3inch catback). So, I started saving for a new turbo because the options to get rid of the creep on the t-25 didn't seem like it wa worth it. About a month later I got a AGP T28. Install went fine, pretty straightforward. Primed it, broke in the turbo for a couple of hours and then I got on it. Still had creep. :mad:

So at this point, I figured the stock o2 housing was holding me back. I took it off, port matched it to the gasket and used a dremel to grind out as much as I could and then smoothed it out the best I could. I couldn't reach some areas, but for the most part I felt I got it pretty good. It was smoother, wider, and I opened up the wastegat area so that the hole was widened a good bit. Installed it, and I still had that damn creep:mad:.

Now I was getting a little pissed. My car was a reconstruct annd the wastegate bracket was damaged in the accident. I didn't replace it at the time because I wasn't having creep problems. SO I figured, maybe thats the problem. So I ordered a new wastegate and Installed it tonight. THE ####ING THING IS STILL CREEPING,. This is with the mbc all the way backed out to the last thread.

I have no idea where to go from here. I was thinking of getting a new o2 housing, but I ported out the stock one pretty good, If I spend a 160 bucks on a new o2 housing and that doesn't work, then I might just take a sledgehammer to this car :mad: not realy but you get the idea.

As far as the boost controller hook ups, I have the bottom nipple connected to a tee in the line between the manifold and BOV. The side nipple goes to the wastegate. The nipple on the turbo is capped off, and the bcs has nothing connected to it, no caps or anything

Please help :cry:

Thanks
 
im in your same boat.

the way i look at it, you can spend 160 on a new o2 housing and possibly stop it, spend another hundred or so on porting the wg hole and getting a bigger flapper and possibly have it stop, maybe even spend another 180 or so on a dumped o2 to again have the possibility, or spend 350 and get an external gate welded to the manifold and definately have it stop. thats what i did.

should get the car back tomorrow, im stoked!
 
I used an O2 dump tube and have not had a problem with creep, the police on the other hand is a differnet story.
 

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definitely get an hks external wastegate (40mm). it will rid u of all boost creep.
 
damn, for a t-28? The thing is I'm going to school soon and was hoping the turbo would be it. But I guess you gotta spend the cash. Would an aftermarket o2 do it, or is the external the only definite way toget rid of it
 
have you tried a intake leakdown test yet? check vfaq to see how. Also try to run a hose from the turbo nipple to the actuator. see if this holds your boost to 10 psi or so. If you find that you have no intake leaks and you still get creep with the turbo hooked up this way then you need a bigger w/g and larger flapper. (thats what I had to do)
 
I got the turbo ported from AGP. I don't know what size it uses but Ben said that he has no problems with creep on his 28's. This is a major thing for me and one of the reason I got the turbo (now) was to get rid of the creep. If I have to upgrade the wastegate, I'm gonna be a little pissed. I don't think it's AGP's fault, but I'm getting a little pissed with the car right now.

droptopgst - how owuld an intake leak cause boost creep. I'm going to try it tonight, but I would like to know how it could cause it. ANyways it couldn't hurt. I'll try the other thing you said also.

THanks
 
The way this was explained to me was, the air is going to go to the area of least resistance. If you have a leak then your turbo is going to be able to flow more air out that way than haveing to force even more through the flapper. If you want to see all the shit I have been through then check out my post

http://www.dsmtuners.com/forums/showthread.php?s=&threadid=38061

I am at the stage of sending my turbo back to have a bigger w/g and flapper put on it.
 
damn, sounds like the problem I'm having. I ported the o2 housing myself. I thought I did a good job but I''m gonna take it off this weekend and bring it down to my uncle's shop. Hopefully they can help me otu with it. I'm still gonna try all the other stuff tonight, but from what I read it doens't sound to promising.

Later
 
On my 16g i still have creep after porting the o2 and having a 34mm WG flapper put in. Taking the o2 back out this weekend and porting it even more. If that does not work either a external or a hiflow cat.
 
I was just reading through and came up with a few more questions.

If I was to get an electronic boost controller, say an avc-r. Would that help with my creep issues? I'm going to do everything else people have told me first, but If all else fails, would this have a chance of fixing the problem

Thanks for all your help guys

Dan
 
I would say that you need to port the o2 more. I went through a similar problem. I ported my o2 my self and thought I did a good job, but it was not enough. So I didn't want to bother with it again so I just had a local DSM shop do it for me and when I saw it I was not even close. A 2g needs to be ported even more because of the higher compression ratio.

Good luck, Matt
 
Originally posted by 92TALONAWD
I would say that you need to port the o2 more. I went through a similar problem. I ported my o2 my self and thought I did a good job, but it was not enough. So I didn't want to bother with it again so I just had a local DSM shop do it for me and when I saw it I was not even close. A 2g needs to be ported even more because of the higher compression ratio.

Good luck, Matt

Yeah, that's what I'm going to try after I do all the other stuff. Thanks for your help guys
 
Originally posted by NewB2dsm
On my 16g i still have creep after porting the o2 and having a 34mm WG flapper put in. Taking the o2 back out this weekend and porting it even more. If that does not work either a external or a hiflow cat.


wouldn't the hi flow cat make boost creep worse?
 
My solution to boost creep:
 

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Ahh my friend, a miller mig, miller plasma cutter, 3/8ths inch plate and some thickwall 3 inch pipe isnt ghetto, its over-engineering...

more:
 

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Originally posted by zac83
Ahh my friend, a miller mig, miller plasma cutter, 3/8ths inch plate and some thickwall 3 inch pipe isnt ghetto, its over-engineering...

more:

Unfortunately, I don' have the know how to do something like that.:)

I guess if I get a new o2 housing, I'm going to look into an external. Emissions is going to be real fun to pass OMG

I still have to try some things, thatnks for all your help and keep the ideas coming :thumb:
 
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