Is there a major downside to boost creep?

[highintenzity4]

Reason Im asking is because I got my o2 housing ported and got a cutout and now the boost creeps about 3-4 psi at higher rpms.... Boost is around 18psi and creeps to about 21..Thanks.

 

[beat90tsi]

Ideally you want the boost to be exactly where you set it, but if you can support the higher boost it shouldn't be a problem. Can you log and see if you are knocking?

 

[highintenzity4]

Cant log rite now but Im going to install my dsmlink very soon.... Glad to hear that boost creep is not a major problem if my motor can handle it... Someone locally told me boost creep would hamper performance.... Dont see how though... Thanks.

 

[Talon96tsiAWD]

well yes, if your knocking it will put a huge damper on performance. If in that 3-4 psi you start hitting in upwards of 10-20 counts of knock, your timing is retarded very low, probably 15* or lower. Yes that will make your car slow.

 

[daren_p]

well yes, if your knocking it will put a huge damper on performance. If in that 3-4 psi you start hitting in upwards of 10-20 counts of knock, your timing is retarded very low, probably 15* or lower. Yes that will make your car slow.

& its possible to wreck a motor if your knocking alot & don't know it. It looks like you have your fuel system covered, so that a plus. Do you have any logger at all? make sure your timing isn't being pulled, if it is I wouldn't let it creep up that high till you know exactly whats going on.

 

[Turbocharged]

Thats too bad there are so many people that creep with their internally gated 50 trims. I can as low as 14 psi on my rs49 with the tubular O2 housing. It doesnt hurt to port the waste gate hole a little too.

Personally I think running 21 psi at the lowest is unacceptable. How tight is the waste gate actuators arm? Loosening it may help.

 

[oldman]

Why are you trying to bandage the problem instead of solving it? 18-21psi isn't that bad at all and can most likely be solved by porting which is almost free - tools and your time.

 

[highintenzity4]

I need to upgrade my mods on profile... I have a pte 60-1 with cut exhaust housing.... How can I eliminate the boost creep? I cant get a o2dump because I have cut exhaust housing on the turbo... Also my o2 is already ported....

 

[oldman]

I need to upgrade my mods on profile... I have a pte 60-1 with cut exhaust housing.... How can I eliminate the boost creep? I cant get a o2dump because I have cut exhaust housing on the turbo... Also my o2 is already ported....

I'm not familiar with cut out exhaust, can you explain.

 

[highintenzity4]

Well I ordered my turbo with cut exhaust housing... In the center of the exhaust housing its cut rather than being connected... Oh and the cut out I have in my exhaust goes rite after my rear o2 sensor... I went to a muffler shop and had it cut out... Sort of like open downpipe..

 

[oldman]

Well I ordered my turbo with cut exhaust housing... In the center of the exhaust housing its cut rather than being connected... Oh and the cut out I have in my exhaust goes rite after my rear o2 sensor... I went to a muffler shop and had it cut out... Sort of like open downpipe..

I see.

The biggest cause of boost creep lies at the entrance of the wastegate path in the turbine inlet. The key in preventing boost creep, in the case of internally gated, is to knock off the material on top of the wastegate entrance to provide a direct air flow path to the wastegate instead of the normal 90 degree turn. However, I have not had the opportunity to try this on a PTE exhaust housing but I think it should work the same due to the fact that it's a bolt on housing, it probably share the same poorly designed wastegate path on a Mitsu housing.

Here's a recent article on a EVO3 with near perfect results. So far, this has been proven to work for 14b, 16G, EVO3 16G and my personal GT12. I'm not saying this will work for you due to my lack of encounter with a PTE housing but I think this will be a great opportunity to try it out, it can be beneficial to both you and anyone with the same issue with a PTE housing.

 

[Empyrials]

i recently had Mad boost creep with my big 16g. I got a hell of a deal on it so i didn't care if i didn't have the supporting mods because i was going to run a low psi that my current setup could handle. while i was getting my tranny rebuilt i decided to clean out my IC. i had already fix'd a few bent fins before but figured might as well clean the inside out with some gas like people say to do. it worked perfect, no boost creep, stays at 14 psi all day long now. it use to jump up to 20+ sometimes, which was why i was thinking of removing it. I don't have a lead foot but it's nice not to always need to be watching where my boost is now.

so try that if you haven't. i didn't look to see if you had a fimc because i saw you said you needed to update your profile, kinda like me. cured everything creep issue i had.

btw i don't have exhaust i just have an O2 dump. which prolly helps a bit

 

[oldman]

while i was getting my tranny rebuilt i decided to clean out my IC. i had already fix'd a few bent fins before but figured might as well clean the inside out with some gas like people say to do. it worked perfect, no boost creep, stays at 14 psi all day long now. it use to jump up to 20+ sometimes, which was why i was thinking of removing it. I don't have a lead foot but it's nice not to always need to be watching where my boost is now.

As a precaution, I suggest performing a boost leak test and make sure that you didn't fix your boost creep by creating boost leaks after you clean out the IC. Boost creep is an exhaust/turbo problem, should not have to do with a clean/dirty IC.

 

[Empyrials]

As a precaution, I suggest performing a boost leak test and make sure that you didn't fix your boost creep by creating boost leaks after you clean out the IC. Boost creep is an exhaust/turbo problem, should not have to do with a clean/dirty IC.

ya it's fine, i did one a couple of weaks be4 and then one after just to make sure. it was the ONLY thing i did other than replace the tranny and now it seems to work, so i dunno what it was for sure, however it works now

 

[highintenzity4]

Man would I love an o2 dump... well i was told the cut exhaust housing would eliminante boost creep thats why I ordered one.. You guys think its a tuning problem? My ecu is chipped for 650s but I havent had a chance to tune yet with the dsmlink. Will soonks n though.. THanks guys.

 

[oldman]

Man would I love an o2 dump... well i was told the cut exhaust housing would eliminante boost creep thats why I ordered one..

Neither one of these will most likely not solve boost creep without proper porting of the turbine housing. The real restriction is in the turbine housing not the O2 housing. If you think porting isn't for you then external wastegate mounted on manifold would be the only way to solve your boost creep properly.

You guys think its a tuning problem?

Why would boost creep have anything to do with tuning?

 

[Turbocharged]

Well I ordered my turbo with cut exhaust housing... In the center of the exhaust housing its cut rather than being connected... Oh and the cut out I have in my exhaust goes rite after my rear o2 sensor... I went to a muffler shop and had it cut out... Sort of like open downpipe..

If you have a "cut exhaust housing" you need to have the o2 sensor housing cut and port matched to the housing. Otherwise the exhaust flow out of the wastegate may be turbulent, hindering your ability to flow exhaust through the wastegate hole.

And, youre running an exhaust setup similar to an open downpipe. That could be a serious problem if you are experiencing boost creep. Your exhaust needs backpressure if you want to be able to control boost.

Still, you should be able to solve this problem from some simple porting...

 

[highintenzity4]

When I port I use a guideline like the gasket... How do I port the o2housing now that I have to eliminate whats in the middle of my o2housing so it can match the cut exhaust housing on my turbo??

 

[highintenzity4]

Hey guys what if i get a tubular o2 housing? Would that help anything?