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Old 10-29-2011, 04:15 PM   #1
the dude
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Location: Casper, Wy
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2002 WRX wagon
WRB

Default 2002 WRX 1st data log review request

Here is my first data log, I am running the 91 oct stage 2 ver 3.00 map. If you could take a look at I would be stoked!

Thanks!

https://docs.google.com/spreadsheet/...hl=en_US#gid=0
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Last edited by the dude; 10-29-2011 at 05:13 PM.
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Old 10-30-2011, 10:04 AM   #2
Cobb Tuning
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Here is my first data log, I am running the 91 oct stage 2 ver 3.00 map. If you could take a look at I would be stoked!

Thanks!

https://docs.google.com/spreadsheet/...hl=en_US#gid=0
Can you list all your mods? I would not do anymore WOT runs or aggressive driving at this point until we figure out what is going on. You don't have any abnormal knock, but your reported airflow is way low and some of your fuel trims are extreme, indicating either a mechanical issue or an unsupported intake is being used (or both).

Bill
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Old 10-30-2011, 12:28 PM   #3
the dude
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Member#: 94542
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Casper, Wy
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2002 WRX wagon
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Default

here are the mods

2.5 in stromung turbo back exhaust
grimmspeed pnp'd headers x pipe and up pipe
stock intake and injectors
ngk bkr7e plugsact streetlite fly wheel

what range should i be looking for on the airflow and fuel trims?

Last edited by the dude; 10-30-2011 at 03:56 PM.
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Old 10-30-2011, 12:31 PM   #4
the dude
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Join Date: Aug 2005
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Location: Casper, Wy
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2002 WRX wagon
WRB

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how many miles should one wait to do a datalog
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Old 10-30-2011, 07:08 PM   #5
the dude
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anyone else have info on fuel trim?

here is a log from the stage 2 91 3.1 map.

just normal driving around town, no heavy throttle, i dont know if this will help anything but here it is.

https://docs.google.com/spreadsheet/...hl=en_US#gid=0

Last edited by the dude; 10-30-2011 at 07:17 PM.
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Old 10-31-2011, 10:31 AM   #6
Cobb Tuning
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here are the mods

2.5 in stromung turbo back exhaust
grimmspeed pnp'd headers x pipe and up pipe
stock intake and injectors
ngk bkr7e plugsact streetlite fly wheel

what range should i be looking for on the airflow and fuel trims?
You should be over 200 g/s with a stage 2 car at high RPM during your WOT run unless you are at high altitude. You are at about 150 g/s - which is way low, even given that you are underboosting. A very common problem on these cars is the "tired" MAF sensor. The sensor reads lower and lower over time and just needs to be replaced. I would replace it with a new one ASAP.

Your long-term fuel trims (i.e. a/f learning 1), should be within +/- 8%. You are hitting some extreme negative trims in your previous log. This is odd as a bad MAF will usually end up with large positive fuel trims. So, I think you have another issue going on here. Given the header install, you may have a pre-front o2 leak there. Did you re-use the old gaskets? If not, did you remove all the old gasket material? The other possibility is a bad front o2.

I would not do any more aggressive driving until you get this sorted out. Your fueling is likely way off and this can cause engine damage under moderate to high load.

Bill
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Old 10-31-2011, 01:46 PM   #7
the dude
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Location: Casper, Wy
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2002 WRX wagon
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i am at about a mile above sea level. the car got a new short block and alll new gaskets were used. the front 02 sensor was replaced about a year ago, the maf sensor is stock still i believe.
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Old 10-31-2011, 02:01 PM   #8
Cobb Tuning
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i am at about a mile above sea level. the car got a new short block and alll new gaskets were used. the front 02 sensor was replaced about a year ago, the maf sensor is stock still i believe.
I would go ahead and replace the MAF sensor with a new one. It is still reading low even at your altitude.

Beyond that, you have potential for one or more of the following related to the extreme negative fuel trims:
1. bad front o2
2. boost leak post-MAF up to front o2.

Given if the MAF is bad and it is still pulling that much fuel, it must be a large boost leak (assuming the front o2 is not bad).

I would go ahead and replace the MAF sensor and then see what happens.

Bill
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Old 10-31-2011, 02:09 PM   #9
the dude
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Location: Casper, Wy
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2002 WRX wagon
WRB

Default

should i try cleaning it first?
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Old 10-31-2011, 04:46 PM   #10
Cobb Tuning
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should i try cleaning it first?
Cleaning rarely does anything in these cases. You can certainly give it a try (with contact cleaner designed for MAF sensors), but often the sensor just needs to be replaced on these older cars. I personally wouldn't chance it.

Bill
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