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Old 10-25-2012, 12:57 PM   #1
LIChuck
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Member#: 266122
Join Date: Dec 2010
Chapter/Region: Tri-State
Location: Patchogue, NY
Vehicle:
2007 WRX Limited
UGM

Default Intermittent boost loss

This weekend I was at the track running with a Cobb 93 octane stage 1 map on a 2007 WRX Limited. The only mod is a STI intercooler. After a couple of laps I had zero boost. I check all the hoses and everything checked OK (removed and reinstalled the intercooler. Replaced the TMIC to throttle body coupler). I got fresh 93 octane gas and reflashed to the Stage 1 91 Octane map. Ran great for 2 laps and then 0 boost again. I reflashed back to the stock map for the next session and again it ran great for a couple of laps and then 0 boost. No CELS at any time. No codes found when I checked with my Access Port. I left the stock map and ran a couple of more sessions with the same results, start with boost and then nada.

On the street, the car runs normally. This only happened on the track with aggressive driving. Oil is fine, no smoke, no over heating, just no boost.

I have no idea what would cause this problem. I talk to a guy that was running a very high performance STI and he was stumped. What do you guys think?
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Old 10-25-2012, 02:39 PM   #2
Tripintaz
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The way you describe the issue makes it seem like its ECU related or the wastegate is getting stuck at high temps?

Subscribed, this is strange.
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Old 10-25-2012, 04:59 PM   #3
LIChuck
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I thought ECU problem which is why I reflashed the map. Maybe wastegate but I don't know how to prove it. Can't drive it on the street like I did on the track.
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Old 10-25-2012, 05:00 PM   #4
Tripintaz
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Quote:
Originally Posted by LIChuck View Post
I thought ECU problem which is why I reflashed the map. Maybe wastegate but I don't know how to prove it. Can't drive it on the street like I did on the track.

So it never acts like this on the street?
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Old 10-25-2012, 06:26 PM   #5
LIChuck
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2007 WRX Limited
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Nope. It was just after a couple of laps of Watkins Glen. I went into town and tried getting into boost on a long uphill and it was fine. It seems that the repetitive boosting caused the problem. Even on the long drive home it was fine all the way.
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Old 11-29-2012, 12:50 PM   #6
LIChuck
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2007 WRX Limited
UGM

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I manually operated the waste gate and the boost seemed to work better after that. Since then I have loaded a 93 Oct map and installed a Cobb ST air intake. The turbo spools much faster and hits the target boosts.

I suspect that the waste gate was hanging open, but can't prove it.
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Old 11-29-2012, 08:53 PM   #7
hutch959
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logs?
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Old 11-30-2012, 11:25 AM   #8
LIChuck
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2007 WRX Limited
UGM

Default

Not yet. I have just been watching the boost gauge.

I need to do some logs and then I have a cat back exhaust to install. I want to make sure everything is OK with the CAI and then the catback before getting into more serious mods.
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