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03-28-2013, 12:27 PM | #26 |
Scooby Specialist
Member#: 154175
Join Date: Jul 2007
Chapter/Region:
NWIC
Location: PDX
Vehicle:07 Impreza Wagon 2.5i??? |
Also, I havent forgotten about this thread guys, I am out of town on vacation for another week, then I wilk be back at trying to figure this stuff out
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04-08-2013, 11:05 PM | #27 |
Scooby Newbie
Member#: 315692
Join Date: Apr 2012
Chapter/Region:
MWSOC
Location: Minneapolis, MN
Vehicle:2005 WRX STi WRB |
I wouldn't be too concerned about the MAP sensor, if it is the same as the turbo cars, it is only used if the MAF fails. As you can see in the log, the MAP sensor maxes out when you hit 2700 rpm, but the mass airflow continues to rise. The ecu is calculating the mass flow rate, and in turn load, from the MAF. As long as your MAF is not pegged, you are ok. Since you switched to a blow through MAF, you will need to re-scale it. This is why your actual AFR doesn't match your target. Your best bet is to find a tutorial on how to scale a MAF.
Perhaps this one: http://forums.nasioc.com/forums/show....php?t=1427448 Make sure you log engine load in g/rev, not relative, to verify it still increases after the MAP pegs. |
04-08-2013, 11:07 PM | #28 | |
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Join Date: Jun 2012
Vehicle:1992 Trans Am |
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04-08-2013, 11:34 PM | #29 |
Scooby Newbie
Member#: 315692
Join Date: Apr 2012
Chapter/Region:
MWSOC
Location: Minneapolis, MN
Vehicle:2005 WRX STi WRB |
It doesn't have to. Manifold pressure is only used when the ecu goes into limp mode from a MAF sensor malfunction.
Assuming the MAF is working properly: Load (g/rev) = MAF (g/s) x 60 / RPM Open loop fueling is based on Load and RPM, no manifold pressure required. It has a manual boost controller, so no pressure required there either. I would guess it will eventually throw a pressure sensor circuit high code, so you will probably have to disable that. |
04-08-2013, 11:44 PM | #30 | |
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Join Date: Jun 2012
Vehicle:1992 Trans Am |
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04-09-2013, 09:13 AM | #31 |
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Member#: 72829
Join Date: Oct 2004
Chapter/Region:
W. Canada
Location: Calgary, Canada
Vehicle:2006 WRX 2015 WRX |
There won't be much boost tuning via the ecu if he is using the 2.5i ECU, which i think he is.
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04-09-2013, 09:20 AM | #32 |
Scooby Specialist
Member#: 154175
Join Date: Jul 2007
Chapter/Region:
NWIC
Location: PDX
Vehicle:07 Impreza Wagon 2.5i??? |
Yep, I am using the 2.5i ecu... I just got back from vacation, and they sent me out of town for work, so I havent made much progress on this yet
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04-15-2013, 05:54 PM | #33 |
Scooby Newbie
Member#: 259013
Join Date: Sep 2010
Chapter/Region:
RMIC
Location: Colorado!
Vehicle:2007 Impreza 2.5i Greyish- Boosted |
hopefully this works out, so their is no need to get a new map sensor to go over 5psi on 2.5i ecu?
Last edited by XSV Klutch; 04-15-2013 at 06:01 PM. |
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