Boost creep out my Arse. Help

[95DsmTsiauto]

Ok, when I first got my car I had no problems with boost creep. All stock. I then put a 3' dejon tool intake on with recirc tube and I get 3 psi boost creep while getting on it. Then I put my sbr exhaust manifold on there and a 3' Apex'i N1 full turboback exhaust. Now, when I get on it, I get 8 psi boost creep and if I'm on a little hill I hit fuel cut. I was told that if I got a Ported EVO3 O2 housing I would be good. But my question is. If I got an evo3 O2 housing ported, wouldn't that make my exhaust more free flowing and make me have more boost creep?

Thanks a lot.

I need to get rid of my boost creep ASAP before I do my fuel upgrades and my T-28 Killer. Oh yes, I don't have my mbc on so I'm still at stock 10 psi. I hit 18 then it slowly works its way down to 10 because either my T-25 just loses boost or I have a boost leak which I'll check for when its summer since I don't have a garage.

 

[Dream On]

http://www.dsmtuners.com/forums/showthread.php?t=186525

 

[keymaster]

The solution to boost creep...finally

 

[ericbev]

I was told that if i got a Ported EVO3 o2 housing i would be good. But my question is . If i got a evo3 o2 housing ported wouldnt that make my exhaust more free flowing and make me have more boost creep?

Boost creep is caused by the wastegate hole not being able to bypass enough exhaust gas to keep your target boost level. Since the hole isnt allowing enough air around the turbine wheel, its flowing into the turbine wheel, thus creating more boost (creep). By installing an aftermarket exhaust you are allowing the turbo to spool faster and flow more air which is making it harder for the internally gated design to re-direct the extra air.

By porting the inlet, 02 housing, flapper hole (or get a bigger flapper), and the blast zone, you are allowing the gate to bypass more air around the wheel instead of into it. With enough proper porting of these areas you should be able to run the desired boost levels without creep.

Here are a few more general porting links. They should give you a good idea of how its done and what is required.

http://www.vfaq.com/mods/porting-turbo.html
http://www.vfaq.com/mods/porting-exhman.html
http://www.vfaq.com/mods/porting-O2.html
http://www.plymouthlaser.com/trbo932.htm

I am not sure how much porting is required to get the desired effect, but you should be able to run 10-12 psi with 3in exhaust, creep free. There are alot of people that have had this problem and hopefully they can elaborate more on their specific situation. You could always reinstall the stock exhaust as a temporary solution untill you get the required fuel mods etc.

I hope that helps.

 

[ryan90tsiawd]

port the crap out of the turbine housing, and the wastegate, also port the o2 housing. you can cut out the center divider section of the o2 housing to help reduce boost creep.