Subaru's OEM wideband front O2 sensor table (10.14 AFR) for any intake

[callisto]

Hi all, I've been decoding the red intake ECUs and one of the cool things I found is that Subaru has rescaled the Front O2 sensor down to 10.14 AFR. I know the community was trying to work out this rescaling a few years ago with black intake vehicles (which were limited to 12.17 AFR), and since both use the same front O2 sensor, that seems useful to share. So here's what Subaru thinks a wideband scaling should look like for gen1 (K00G black intake, S10C red intake) Front Oxygen Sensor Scaling A/B.

EDIT: See tomm's comment below; Ecutek may have a better-scaled table, and there's other threads on this forum discussing that scaling years ago as well. This may not be the best scaling, but any of them is going to be an improvement over what shipped in 2012.

[tomm.brz]

they updated it in 2017 because they implemented full time closed loop fueling in non-euro tunes
in Euro tunes they implemented it in 2018 with Q00G calibration

anyway any tuner is rescaling the lambda since the beginning.. oft tunes have it rescaled to

Subaru scaling anyway is still a bit off compared to real life values, when you get to compare it to a wideband aftermarket sensor you see it s pretty off
Ecutek gives a pretty good rescaling to use that is more precise in their pdf files

[callisto]

Originally Posted by tomm.brz

Subaru scaling anyway is still a bit off compared to real life values, when you get to compare it to a wideband aftermarket sensor you see it s pretty off
Ecutek gives a pretty good rescaling to use that is more precise in their pdf files

Hmm, I'll have to look into that, but as I don't have Ecutek I'm not sure I have access to those. Thanks for the tip!

[tomm.brz]

easy to find them Also in google

[jamie0404]

Originally Posted by callisto

Hi all, I've been decoding the red intake ECUs and one of the cool things I found is that Subaru has rescaled the Front O2 sensor down to 10.14 AFR. I know the community was trying to work out this rescaling a few years ago with black intake vehicles (which were limited to 12.17 AFR), and since both use the same front O2 sensor, that seems useful to share. So here's what Subaru thinks a wideband scaling should look like for gen1 (K00G black intake, S10C red intake) Front Oxygen Sensor Scaling A/B. fnf

EDIT: See tomm's comment below; Ecutek may have a better-scaled table, and there's other threads on this forum discussing that scaling years ago as well. This may not be the best scaling, but any of them is going to be an improvement over what shipped in 2012.

The best way to determine which scaling method is best for your car is to experiment and see which one gives you the best results.

[FR-S2GT86]

Originally Posted by jamie0404

The best way to determine which scaling method is best for your car is to experiment and see which one gives you the best results.

So why don't you share with us your experimentation efforts? We're really interested in learning from your vast knowledge on the subject....



...Reported

[callisto]

Originally Posted by jamie0404

The best way to determine which scaling method is best for your car is to experiment and see which one gives you the best results.

I’m working on a different project than the usual max-perf tuning, call it stock-plus if you like, but in this specific case I’d never seen the official 17-20 sensor scale posted, so I shared it. If you have a tune or a dyno you can in theory get better outcomes than stock, so go for it!

[AussieBRZ]

Originally Posted by callisto

I’m working on a different project than the usual max-perf tuning, call it stock-plus if you like, but in this specific case I’d never seen the official 17-20 sensor scale posted, so I shared it. If you have a tune or a dyno you can in theory get better outcomes than stock, so go for it!

I've used this scaling here on all cars 2012-2021

Works well


https://www.ft86club.com/forums/showthread.php?t=82875