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Old 06-01-2016, 08:19 AM   #1
Yobiwan
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overcome stock maf limit with impreza MAF sensor

I'm using HKS v2 supercharger, and almost capped stock maf now. (4.9v 280g/s at 65F IAT )

in my country , no one can handle SD method for FRS, so I should find another easy way to use more boost.


We can use impreza (forester ) stock maf sensor to our car
without any modification.

part number is 22680AA380

same dimension, same harness

but much higher maf reading limit ( about 130%)

so we can use more boost without Speed density method.




Stock MAF sensor log datazap

http://www.datazap.me/u/yobiwan/hks-...3&zoom=647-833



Impreza MAF sensor log datazap

http://www.datazap.me/u/yobiwan/wrx-...3&zoom=368-688


both log are from same car, same boost.
you can see Maf voltage difference between them.

4.84v vs 4.44v on same boost , same RPM ,different IAT (77 Fvs 91F)


it's first log with impreza maf scale, so afr is not on target.
but it's close enough to use.
cranking and closed loop driving were smooth too.




log after 1st open loop maf recalibration

http://www.datazap.me/u/yobiwan/wrx-...3&zoom=426-648
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Last edited by Yobiwan; 06-01-2016 at 08:18 PM.
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Old 06-01-2016, 12:19 PM   #2
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Hi,

If you need a tune for speed density I am sure we can accommodate. We now have over 1000 tunes across the world, with more than 500 of those running speed density.

So if you need any assistance, just let us know.

Cheers,
William Knose
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Old 06-02-2016, 11:17 PM   #3
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Would this do any good for frs Brz without turbo charger? Any error code thrown?
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Old 06-03-2016, 03:28 AM   #4
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Originally Posted by turtlefeeder View Post
Would this do any good for frs Brz without turbo charger? Any error code thrown?
It'll work if you change the map, if that's what you mean?
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Old 06-03-2016, 03:30 AM   #5
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Would this do any good for frs Brz without turbo charger? Any error code thrown?
no, it's for FI car. not for NA. you can use with NA car, but there is no benefit at all.


if you want to use WRX's MAF sensor, you should change MAF scale table in your ROM too.

I'll upload my maf scale ( after 1st open loop rescale) here.
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File Type: zip WRXMAF.zip (7.0 KB, 158 views)
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Last edited by Yobiwan; 06-03-2016 at 05:26 AM.
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Old 06-03-2016, 07:23 PM   #6
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Quote:
Originally Posted by Yobiwan View Post
no, it's for FI car. not for NA. you can use with NA car, but there is no benefit at all.


if you want to use WRX's MAF sensor, you should change MAF scale table in your ROM too.

I'll upload my maf scale ( after 1st open loop rescale) here.
Nice work.
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Old 04-17-2017, 04:24 PM   #7
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Debating doing this for my 10.0:1 built FA. Not sure if its worth doing. I know it will be a hybrid tune as boost will be north of 22psi. Would the better resolution of the WRX MAF help the low speed driveability?
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