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Old 07-11-2019, 05:47 PM   #26
alexmartynyuk
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Quote:
Originally Posted by subaru_gc8 View Post
I had that problem too, turns out the stock afr o2 sensor was bad. just a fyi make sure you use oem subaru for any metering sensors ie maf and o2, also have you noticed your gas milage falling off a bit?
If it was just the front oxygen sensor that was bad then the car would drive fine in boost, if closed to open loop fuel delay was setup properly the car should go into open loop fueling fairly quickly. Open loop fueling relies on proper maf scaling and looks at maf signal and injects proper amount of fuel. But still good to make sure the oxygen sensor isn't faulty.
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Old 07-11-2019, 05:54 PM   #27
Aallgire
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Originally Posted by subaru_gc8 View Post
I had that problem too, turns out the stock afr o2 sensor was bad. just a fyi make sure you use oem subaru for any metering sensors ie maf and o2, also have you noticed your gas milage falling off a bit?
Yeah if I'm not careful I won't see above 16
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Old 07-11-2019, 07:27 PM   #28
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Uhh I might have found a problem, hot side of the turbo has a badge that reads garrett gt3037-56t not the steam speed 20g
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Old 07-11-2019, 08:53 PM   #29
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Steam speed turbos are stamped on the cold side, kinda like forced performance does with their turbos.
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Old 07-11-2019, 08:56 PM   #30
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Originally Posted by Aallgire View Post
Uhh I might have found a problem, hot side of the turbo has a badge that reads garrett gt3037-56t not the steam speed 20g
And the fact is a gt3037 refers to the turbine wheel it uses, which from the specs I pulled up the steam speed 20g does use a GT30 turbine wheel so nothing to be alarmed about.
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Old 07-11-2019, 09:02 PM   #31
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And the fact is a gt3037 refers to the turbine wheel it uses, which from the specs I pulled up the steam speed 20g does use a GT30 turbine wheel so nothing to be alarmed about.
In that case I have no leads then 🙄 I fixed all the leaks I found with the smoke test 😥
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Old 07-12-2019, 12:18 AM   #32
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Well I would say if you had a log then it would be nice to look it over but donít intentionally take it into boost. Just look things over really well, see if you can introduce smoke into the system to check for obvious leaks and go from there.
What're the chances it's an electrical issue? Low voltage or soemthing? I noticed my wideband was looking kinda dim for a bit today
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Old 07-12-2019, 12:46 AM   #33
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What're the chances it's an electrical issue? Low voltage or soemthing? I noticed my wideband was looking kinda dim for a bit today
Anything is possible. If you have an aem uego then it can dim when ambient light changes, at least thatís how mine and my brothers behave.
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Old 07-12-2019, 03:38 PM   #34
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Anything is possible. If you have an aem uego then it can dim when ambient light changes, at least thatís how mine and my brothers behave.
How about a really leaky BOV?
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Old 07-12-2019, 04:36 PM   #35
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How about a really leaky BOV?
Possible but not likely.
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Old 07-12-2019, 10:51 PM   #36
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do you have a way to check fuel pressure? Is your fpr working properly? Or is the vacuum line running to it properly connected to the manifold and fpr?
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Old 07-13-2019, 11:51 AM   #37
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do you have a way to check fuel pressure? Is your fpr working properly? Or is the vacuum line running to it properly connected to the manifold and fpr?
I can make sure the vacuum lines, but idk how to check fuel pressure. There's 2 lines out 1 in, and no Schrader valve so I'm.not sure which to hook it to
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Old 07-13-2019, 03:38 PM   #38
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Quick update, I spent all day the last 2 days finding and fixing leaks. Made sure the inlet hose clamp was tight and seated right, all the lines to the EBCS were leaking, the back of the TMIC was leaking, the bov is leaking (fairly badly) the turbo out was leaking, still is a little but I have to put a new slave cylinder in this week so I'll address that then. Now I need to figure out how to test fuel pressure, and once that's checked and fixed if needed I think it needs a re tune. On a Dyno lol.
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Old 07-13-2019, 03:39 PM   #39
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It still leans under boost, but it just spools like a bat outta heel up to 15-18 psi before it leans out, compared to 10ish sometimes. Off the line it feels better. I think that bov leaking so bad may be the rest of the issue. With under 10psi pressure it was smoking like an open hose
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Old 07-17-2019, 12:12 AM   #40
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Is it a vent to atmosphere bov, if so and it was leaking to atmosphere it would cause rich concerns. Does the afr take a second to lean under boost or does it lean pretty instantly. Also what afr under boost. As for fuel pressure testing, youll need the right quick connection between the feed fuel line, and rail along with the gauge to test fuel pressure. If you know someone that knows/has the setup would be best! But good finds on all the leaks!

Last edited by PWpaperweight; 07-17-2019 at 12:19 AM.
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