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Old 09-27-2012, 04:33 PM   #1
zpl2
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Default Afr tune possible?

Hey I just got a 2001 forester n/a and was told there was an afr adjusting tune on it. My question is there a way to just adjust afr with no ecu reprogramming. If im not mistaken an 01 forester with no piggy back or ecu swap are not reprogrammable.
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Old 10-03-2012, 01:01 PM   #2
zpl2
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Bump!!
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Old 10-03-2012, 01:45 PM   #3
renob123
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If I had to guess, I'd say it's one of those stupid MAF resistor things you can get on eBay. Look for something like this under the hood:

eBay Link

That's the only thing I can think of that could be called an "afr adjusting tune" that isn't a piggyback, standalone or reflash.

Jacob
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Old 10-03-2012, 02:58 PM   #4
RaceFaceXC
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There are also similar devices to the MAF thing in the previous post that adjust the O2 sensor signal. Chk that harness, too.
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Old 10-03-2012, 03:13 PM   #5
eg33GC
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adjusting the o2 sensor will not have any impact on wot fueling
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Old 10-04-2012, 12:20 AM   #6
RaceFaceXC
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Quote:
Originally Posted by eg33GC
adjusting the o2 sensor will not have any impact on wot fueling
Sure it will. Open loop fueling does not typically start until well past 4k rpm in the first 3 gears on a factory tune at 100% accel pedal angle. That's a broad generalization based on my experiences with n/a Subarus using OBD-II or later systems.
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