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Old 09-16-2012, 04:41 PM   #1
NikeCheck246
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Join Date: Mar 2008
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2002 WRX Stage 3
PSM

Default Bad gas mileage and Poor Performance

Just kind of a general question. It's a 2002 WRX Sedan, AP V1, running VF39 93 Octane Map. VF39, TurboXS Mid, Down, and Up, HKS Hi-Power, STi Pinks, SSAC Front Mount, Perrin Short Ram Intake.

Currently the car is getting terrible gas mileage and hesitating mid-rpm. The exhaust has the non-fouler on the second O2 sensor. With the new map, does the ecu need the rear O2 to read true numbers to function correctly? Could this be causing a rich condition?
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Old 09-16-2012, 04:42 PM   #2
werks04
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Does it smell like raw gas coming out your tail pipe
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Old 09-16-2012, 04:58 PM   #3
NikeCheck246
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Not that i can tell
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Old 09-16-2012, 06:49 PM   #4
Black94Snake
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Originally Posted by NikeCheck246 View Post
SSAC Front Mount, Perrin Short Ram Intake.
these are likely your problems... get a professional tune.
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Old 09-16-2012, 09:37 PM   #5
NikeCheck246
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From what I can tell, the Perrin is identical to the Cobb, and I am running the Cobb SF Intake map. The SSAC is going to hurt response, but I don't think it is going to make it run rich.
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Old 09-17-2012, 10:37 AM   #6
Cobb Tuning
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Originally Posted by NikeCheck246 View Post
From what I can tell, the Perrin is identical to the Cobb, and I am running the Cobb SF Intake map. The SSAC is going to hurt response, but I don't think it is going to make it run rich.
The Perrin intake is not identical to the Cobb SF intake and will require a custom MAF calibration. Using the wrong intake for a given map can cause major problems as it can potentially introduce load errors, which causes issues with both fueling and ignition/cam. timing. In extreme cases, this can cause engine damage. Your front mount is also outside the scope of the map.

I would consider trading in the v1 AccessPORT for a v2 AccessPORT. This will give you the capability to data log to see what is going on, along with a lot of other features including live data monitors from a large selection of parameters, launch control, free AccessTUNER Race tuning software, and more. We do offer a $200 credit towards a new v2 AccessPORT when you trade in your old one to us:
http://www.cobbtuning.com/AccessPort...in-s/70459.htm

If that is not in the budget, then I would at least get a cable to use with open source logging software (RomRaider) and get some logs. You may be able to do this with the v1 cable if you get a decent serial to USB converter (and install its drivers). If you want to keep your mods as is, you will need to get a custom tune.

Bill
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