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I'd like to know if the stock '04 RSX TypeS psuedo wideband 02 sensor is suitable for tuning a supercharged engine running E85? It was recommended to use the stock sensor since it is wideband and the ECU is a PRB K-series one, so...sort of plug and play.

The ECU is a Doctronic, basically same as KPro.

I ask because I've read that AFR's for E85 should be down in the 9.5 range, and perhaps even a little richer if supercharged.

I've also read that the stock 02 sensor for the 04 RSX, while called wideband, only reads down to about 11.7.

Yet, I was told that it should be suitable.

What do you experienced guys think?
 

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Searched, but couldn't find the answer..

I'd like to know if the stock '04 RSX TypeS psuedo wideband 02 sensor is suitable for tuning a supercharged engine running E85? It was recommended to use the stock sensor since it is wideband and the ECU is a PRB K-series one, so...sort of plug and play.

The ECU is a Doctronic, basically same as KPro.

I ask because I've read that AFR's for E85 should be down in the 9.5 range, and perhaps even a little richer if supercharged.

I've also read that the stock 02 sensor for the 04 RSX, while called wideband, only reads down to about 11.7.

Yet, I was told that it should be suitable.

What do you experienced guys think?
For the stock O2, you can use it for tuning; however, an aftermarket wideband is preferred as the stock O2 can't read below 11 if I remember. So, I'm tuned to 11.5 for WOT and my stock O2 sensor was fine.

If you are running richer, you need an aftermarket wideband... I don't recall anyone recommending to run at 9.5... I think that is too rich. If you have e85, that allows you to advance timing quite a bit.
 

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Searched, but couldn't find the answer..

I'd like to know if the stock '04 RSX TypeS psuedo wideband 02 sensor is suitable for tuning a supercharged engine running E85? It was recommended to use the stock sensor since it is wideband and the ECU is a PRB K-series one, so...sort of plug and play.

The ECU is a Doctronic, basically same as KPro.

I ask because I've read that AFR's for E85 should be down in the 9.5 range, and perhaps even a little richer if supercharged.

I've also read that the stock 02 sensor for the 04 RSX, while called wideband, only reads down to about 11.7.

Yet, I was told that it should be suitable.

What do you experienced guys think?
I have a O2 RSX-S that is set up with an aftercooled supercharger pushing 10.7 psi. I run primarily E85 fuel. Engine is controlled by Hondata Kpro 4, with a AEM digital wideband O2 AFR UEGO gauge, air/fuel ratio controller, & sensor (part #30-4110) wired directly to the ECU as the primary O2 sensor. The tuners that I have experience with would not even touch my car unless I had a more accurate reading O2 sensor.
 

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For the stock O2, you can use it for tuning; however, an aftermarket wideband is preferred as the stock O2 can't read below 11 if I remember. So, I'm tuned to 11.5 for WOT and my stock O2 sensor was fine.

If you are running richer, you need an aftermarket wideband... I don't recall anyone recommending to run at 9.5... I think that is too rich. If you have e85, that allows you to advance timing quite a bit.
I've been reading that most O2 sensors are calibrated to operate based on lambda and then, assuming lambda of 1.0 = 14.7:1 AFR (gasoline engines), giving a display of this calculated "AFR"

So even though e85 stoich AFR is actually 9.8:1, when running at this AFR with e85 the O2 sensor will display an AFR of 14.7:1 because it's reading a lambda of 1.0 and calculating the AFR as if the fuel were gasoline.

https://e85vehicles.com/e85/index.php?/topic/1001-stioch-and-wot-e85-afrs/

I'm wondering if this is how our O2 sensors work though...
 

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For the stock O2, you can use it for tuning; however, an aftermarket wideband is preferred as the stock O2 can't read below 11 if I remember. So, I'm tuned to 11.5 for WOT and my stock O2 sensor was fine.

If you are running richer, you need an aftermarket wideband... I don't recall anyone recommending to run at 9.5... I think that is too rich. If you have e85, that allows you to advance timing quite a bit.
I've been reading that most O2 sensors are calibrated to operate based on lambda and then, assuming lambda of 1.0 = 14.7:1 AFR (gasoline engines), giving a display of this calculated "AFR"

So even though e85 stoich AFR is actually 9.8:1, when running at this AFR with e85 the O2 sensor will display an AFR of 14.7:1 because it's reading a lambda of 1.0 and calculating the AFR as if the fuel were gasoline.

https://e85vehicles.com/e85/index.php?/topic/1001-stioch-and-wot-e85-afrs/

I'm wondering if this is how our O2 sensors work though...
I'm actually not running E85, just regular premium 93 gasoline. I thought you can set those values in kpro settings if you are running E85 and adjust the lambda values accordingly.

I do have methanol injection to assist with intake temps. The boost in octane while spraying does allow me to advance timing a bit (gradually) using the nitrous tabs. With it, I advance timing about 6* and cut -1200 of fuel at redline to keep AFR at 11.5 during WOT.
 
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