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01-07-2018, 07:19 PM | #1 |
Scooby Newbie
Member#: 428540
Join Date: Aug 2015
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STi Not hitting target boost
Hey guys, i'm having troubles with my tuned 2012 sti car not hitting target boost, i checked the vacuum lines and everything seems kosher, also disconnected the battery terminal and pumped the brakes, then tried again right after that, with the same effect. I understand this means its not a tuning related issue, but a mechanical one, so i logged on Romraider and i noticed the wastegate duty cycle going to 0 after the car hits 11 or so psi. My question is the waste gate the issue?
https://docs.google.com/spreadsheets...it?usp=sharing
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01-07-2018, 11:04 PM | #2 |
Scooby Specialist
Member#: 6176
Join Date: Apr 2001
Chapter/Region:
NWIC
Location: Roy,WA
Vehicle:15 WRX, 04 wrb STi 85 wrb BRAT |
Not a tuner or expert, but I would say because it's detecting knock feedback for though the entire run, it may also be limiting boost to prevent more knock. I've read 0 to -2 on occasion is nothing to worry about constant or over 2 should be checked out.
But because it's detecting knock does not mean you have knock. Loose or rattling engine components (heat shield, a/c lines...) could fool the knock sensor. |
01-08-2018, 02:21 AM | #3 | |
Scooby Newbie
Member#: 428540
Join Date: Aug 2015
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Quote:
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01-08-2018, 09:55 AM | #4 |
Scooby Specialist
Member#: 231700
Join Date: Dec 2009
Chapter/Region:
MAIC
Location: Central PA
Vehicle:2004 WRX Wagon WRB |
The WGDC is only going to 0 after you let off the throttle. If you weren't having any issues previously with the tune, then the current issue is likely mechanical as you suspect.
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01-08-2018, 11:30 AM | #5 | |
Scooby Newbie
Member#: 428540
Join Date: Aug 2015
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Quote:
Ahh I see, any idea what mechanical issue might be the culprit? I've checked the post turbo lines and the 3 port ebcs connections and all seems in order |
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01-08-2018, 01:47 PM | #6 |
Scooby Specialist
Member#: 231700
Join Date: Dec 2009
Chapter/Region:
MAIC
Location: Central PA
Vehicle:2004 WRX Wagon WRB |
What is your target boost and what mods do you have?
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01-08-2018, 01:57 PM | #7 |
Scooby Newbie
Member#: 428540
Join Date: Aug 2015
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01-09-2018, 11:46 AM | #8 |
Scooby Specialist
Member#: 231700
Join Date: Dec 2009
Chapter/Region:
MAIC
Location: Central PA
Vehicle:2004 WRX Wagon WRB |
Can you log the relative target boost instead of absolute? That way it would show exactly what boost the ECU is calling for.
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01-09-2018, 12:51 PM | #9 |
Scooby Newbie
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Join Date: Aug 2015
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