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Old 06-02-2010, 09:24 AM   #1
dman918
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Default Stock turbo boost issues: few questions...

Hello everyone,
I have a 2006 STI with stock turbo. It does have a full turboback, perrin header and short ram intake. I have an AP with an etune and am running into a weird issue. At WOT, I hit only ~14-15lbs of boost (in 2nd and 3rd gear), and I was told it should be a couple more pounds than that. I do, however, hit 17lbs in 4th (at least according to my gauge - I need to log 4th gear to be 100%). Now, looking at the logs from 2nd and 3rd gear, I am hitting 100% injector duty cycles at WOT.

I was told to check for leaks, and I had two mechanics do just that (one tested by spraying around the hoses and the other did a smoke test). No leaks. I have a HKS BOV. Took it off and went back to stock but no change. I do have a new BOV/Intercooler gasket on the way just in case, but I doubt it's that since there wasn't any issues according to the leak tests the mechanics did.

I was told since there is 100% duty cycle, he thought there was a leak, but again, I can't find it. Can anyone think of anything to try? One thing recommeneded to me was a EBCS and a Walbro fuel pump, but I was wondering if that's necessary considering I'm running the stock turbo.

Anyone have suggestions or thoughts? Thanks for your help!
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Old 06-02-2010, 10:15 AM   #2
48mpg
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those are inferior leak tests. with the engine running you cant hear any leaks and its only under a little vacuum. also, not all the connections are easily accessible to spray water on and look closely at.

do a proper leak test and pressurize the intake tract and then look/listen for leaks. with my experience at least, you will know pretty quickly if you have a leak and where the leak is.

i dont know if doing a leak test is the right way to find whats wrong, but if you are going to do the test, do it properly.
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Old 06-02-2010, 12:26 PM   #3
dman918
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OK, I can look to have that done. Thanks. Anything anyone want to add or comment on?
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Old 06-08-2010, 11:11 AM   #4
dman918
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Still need the pressure test. Just want your input on getting just a fuel pump. Worthwhile on the stock turbo? Not looking to upgrade the injectors at this point.
Thanks,
Mike
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Old 06-08-2010, 01:58 PM   #5
joosky
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it wont hurt if u plan on a turbo upgrade
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Old 06-08-2010, 02:02 PM   #6
dman918
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I'd definitely get one if I did a turbo upgrade. However, on the stock turbo with the above mod list?
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Old 06-24-2010, 10:24 AM   #7
dman918
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OK, so verified no leaks. I did change the fuel pump to a Walbro. Still low boosts. I guess the target boost on this map is 19lbs. Again, certainly not hitting anywhere near that in 2nd or 3rd. I was told my "wastegate cycle is pegged at 85%".

Should I try a restrictor pill? EBCS? Help please.
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Old 06-24-2010, 02:24 PM   #8
colinsdad
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Smile I'm going through a similar issue...

with my forester XT- It runs/idles well, but, I'm definitely missing boost as well. I emailed Peaty (The "Modfather" on Scooby Mods) and he suggested I check my IC Y-pipe for leaks, spray the MAF out and check the BOV for leaks (on a stock application). The OTHER item I found may be an issue is the Banjo bolt on the turbo oil supply line. I know I was having issues because I started having a drop in boost following a lengthy towing session with my Forester- It has never been checked and/or changed. so, i went and purchased some Metric sockets and will remove it today. One caveat though is that I believe your bolt for the STi application is next to the DP...making it a bitch to access. Do a search on Scoobymods and here to see what you can find. Let me know what you find, as I am trying to troubleshoot my boost issues as well. Good luck!
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Old 06-26-2010, 10:37 AM   #9
dman918
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Well I am going to try an EBCS and see what happens (with revised tune, of course).
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Old 07-08-2010, 11:50 AM   #10
dman918
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Looks like the ebcs did the trick. Boosting with no issues whatsoever.
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