Boost creep.. please help.

[Boostit]

Before I start.. here are my current mods:
small16g internally gated 9psi wastegate default, MBC(set at 9psi), ARC BOV, 3'' Apex-i turbo back Dunk

Well, I am really having a tough time right now. Problem diagnosing this last thing before the car is running right.

Here is the deal.. I have a pretty bad boost creep. It used to sit steady at whatever i set the boost at. Now, I have the MBC set at 9psi.. as i rise above 4500rpms, the boost starts creeping. I shut down before i see how high it gets, due to stock fuel system, but by 5800rpms it is at 15psi. My redline is at 7200rpms.

What i wanna know is, what could be causing this.. it was fine until i had some head work done back in this past december.. since i got it back, it would creep but only about 2-3psi.. now it is doing 5-10psi creep. All exhaust leaks (3 of them) have been repaired this past week.. still have the problem.

Now my clutch is burnt up pretty bad, could my clutch be causing this? (not really sure how, but just giving you the info needed)

Our best guess so far is the wastegate actuator. We have also been told that the o2 needs to be ported out.. since the exhaust isn't leaving the turbine fast enough. Anything you guys can tell me from this? any info/past experience is helpful.. thanks!

Ryan

 

[Boostit]

please guys, any help would be appreciated.

 

[TurBoGs-T]

The o2 housing needs to be ported and the exhaust housing on the turbo NEEDS to be ported. I cannot stress that enough. Anytime a 16g is installed it HAS be ported. You need to port so the wastegate hole is alot more exposed and if you can open the hole up a little bit more. That will solve your problem.

 

[92awddsm]

Only thing I can think of is a wg actuator going bad. Get a hand held vac pump and connect it to the actuator and see if it will hold vac or leak down. If it leaks, thats probably the problem.

 

[Jebus[tuning]]

Or say screw it and get an external dump

 

[92awddsm]

The o2 housing needs to be ported and the exhaust housing on the turbo NEEDS to be ported. I cannot stress that enough. Anytime a 16g is installed it HAS be ported. You need to port so the wastegate hole is alot more exposed and if you can open the hole up a little bit more. That will solve your problem.

Well, since it hasnt creeped this bad the whole time, you method is just a band aid. Stress porting all you want but he needs to find the real problem before he tries to patch it up.

 

[95allorfront]

Hey i dont know much at all about this subject but all ive realy read is that you need a ported turbine housing and o2 housing and a larger flapper for the wastegate dump. I just say this cuz i have a similar setup and my boost doesnt even stay where i had it set and it will rise to 20 psi and hit fuel cut (i let it get up there once on accident before i realy noticed it was creeping, was set at 14) and i was just wondering if the actuator could realy be the problem or does it need porting.

 

[92awddsm]

Check the actuator firs and if it holds, it might need to be ported. I said the actuator on his^ because it hasnt always creeped like this. If you have had the 16g on for a while, and it didnt creep that much but has gotten progressively worse over time with no new mods, actuator is usually the culprit.

 

[TurBoGs-T]

you method is just a band aid. Stress porting all you want but he needs to find the real problem before he tries to patch it up.

it might need to be ported.

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Having an unported exhaust housing is a REAL problem.

 

[92awddsm]

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Having an unported exhaust housing is a REAL problem.

If the creep was there as soon as the 16g was installed, then yes, I say it needs to be ported. That is not the case, he didnt have this creeping problem before so I would look at other things before going this route. Yes, porting does help and is good for power but again, he didnt have the problem originally so how would an unported o2 housing start creating boost creep all of a sudden when it didnt before? And if you look at his mods, he has 3" turbo back. Usually turbo back means he doesnt have a stock o2 housing, but some sort of tubular o2.

 

[TurBoGs-T]

If the creep was there as soon as the 16g was installed, then yes, I say it needs to be ported. That is not the case, he didnt have this creeping problem before so I would look at other things before going this route. Yes, porting does help and is good for power but again, he didnt have the problem originally so how would an unported o2 housing start creating boost creep all of a sudden when it didnt before? And if you look at his mods, he has 3" turbo back. Usually turbo back means he doesnt have a stock o2 housing, but some sort of tubular o2.

Well it just seemed like you were going out of your way to say i was wrong or my advice was bogus. I had a 3inch turbo back with a stock o2 housing on both of my cars, both crept, both got ported and both were fixed. That's the only reason i stress it so much. And he did say....

it was fine until i had some head work done back in this past december.. since i got it back, it would creep

So the head work may have helped caused it also. porting the head allows more flow.

Both of us have the right idea, i just didn't understand why you chose to make mine seem like i was way off.

 

[92awddsm]

Well it just seemed like you were going out of your way to say i was wrong or my advice was bogus. I had a 3inch turbo back with a stock o2 housing on both of my cars, both crept, both got ported and both were fixed. That's the only reason i stress it so much. And he did say....



So the head work may have helped caused it also. porting the head allows more flow.

Both of us have the right idea, i just didn't understand why you chose to make mine seem like i was way off.

I wasnt picking you out. It was just you and me that had replied at the time and only 2 others have replied since we started. Im not saying you are wrong or right, Im just pointing out other possibilities since everyone always jumps the gun and say port, port, port. Ultimately, neither of us know the real problem since we arent there looking at it. I wasnt trying to offend you so lets keep this friendly because we are both dsm owners which means we are a rare breed(usually dumb and broke from owning a dsm)

 

[TurBoGs-T]

lets keep this friendly because we are both dsm owners which means we are a rare breed(usually dumb and broke from owning a dsm)

I'm with you.

 

[Boostit]

thank you for the advice guys.. I will be trying the handheld vaccum test here soon. Need to find one to buy or make.. either way, the WG will be tested. I am also gonna look into porting the exhaust mani and o2 housing, might just pick up an Evo III ported. Got a guy locally that will port it cheaply and quikly.. i would, but i dont have the tools.

Anyway, I am also installing a Apex-i AVC-D next week to see if it's the 2 year old "Home depot" MBC that is causing it.. I have been told that it is possible. These little problems are a pain to figure out.

Thank you all for your help and diagnoses.. i really appreciate it.

 

[TurBoGs-T]

i would, but i dont have the tools.

No excuses!!

That's the one i used and it worked great.