Originally Posted by MRF582
That's fantastic news! Always wondered if the car would run the same if I just moved the O2 post-turbine. This'll let me get some semi-legitimate AFR readings using the stock sensor even under boost!
Wait a minute... After comparing my 04 WRX ROM to that Group N ROM, the Front O2 scaling isn't any different. Every mA value corresponds to the same AFR. The only difference is the Group N ROM has more cells so the O2 sensor is scaled down to 10.x instead of just 11.36... Is there a huge difference between your 02 WRX ROM and this Group N ROM?
I have had the front O2 sensor in the downpipe for almost a year. I haven't had to change the scalings and it is acurate there under boost. I tune the car with it. I don't own a wideband. It does max out rich at 11.3, but I don't usually tune richer than that anyway, so it works out.