[rjahl]

Originally Posted by jonwilli

https://www.1addicts.com/forums/show....php?t=1066291

I wonder if Hassmachine knows how the DME uses the pre cat O2 sensor readings for fuelling? i.e. is fuelling for cylinders 1, 2 and 3 exactly the same as it is using the cylinder bank O2 readings or is the DME clever enough to interpret changes in O2 reading to each individual cylinder.

I'd be interested in this as I have ARMA headers (based in UK need RHD) and I had the sensor 1 after the merge previously and had idle hunting. I have now moved the O2 sensor to the bung by cylinder 2 and 5. Would like to know what is the optimum location for a smooth running engine and to keep emissions low.

Put it this way, there is a timing factor for the location of the O2 sensors. Some cars have the sensor further downstream and the sensor feedback system uses a different timing value.

I'm pretty sure the sensor bungs should be at the collector and not on a single pipe as shown. The tune should adjust the feed back timing or sensor distance.

Use good headers and a good tuner and you won't be guessing.

I would not recommend headers without a matching tune. My two cents.