davidc1

I have a MY04 S2k, using the Doctronic ECU (similar to KPro, but no hardware sensor conversion needed). It's supercharged (SOS Novi 1200 at about 10psi) and just installed the SOS flexfuel kit.

I'd like to know if the stock '04 RSX TypeS psuedo wideband 02 sensor is suitable for tuning? 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.

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?

ninetysixyenko

Stock RSX Wideband can read down into the mid 10s and has been used for E85 often. while people do it, I wouldn't use it for your AFR tuning - I would use it for your closed loop operation and get a good aftermarket Wideband for AFR tuning.

davidc1

Thanks. That is what I have done. I will use the RSX pseudo wideband for closed loop operation in the primary position, and the PLX wideband in the secondary position, using a test pipe, for tuning and monitoring.

Mijae007

anyone else have a problem with their o2 sensor and wideband fouling out im presuming from moisture at cold startups??? Neither of my sensors last very long...like 3months then boom, they start reading all erratic again. any solutions???

yamahaSHO

The O2 does not care if it is ethanol or supercharged.

If the sensor has poor placement, it'll happen. When I turned my downpipe upside down to get the car moved, I would kill the sensor in one startup.