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View Full Version : Wideband O2 sensor palcement


red_z28
02-17-2009, 08:17 PM
Where would be the best spot for my O2 sensor? I have true duals so would it be best to put it right after the X or before?
Colossus
02-17-2009, 10:41 PM
The closer to the source of the exhaust the more accurate the reading. Ideally you could put an O2 in each primary right up by the head. However the amount of wiring and the limited room make that infeasible. So put them as far forward as possible.
BLOWNDFIZ
02-18-2009, 09:57 AM
The closer to the source of the exhaust the more accurate the reading. Ideally you could put an O2 in each primary right up by the head. However the amount of wiring and the limited room make that infeasible. So put them as far forward as possible.

While most companies do say to put the sensor as close as possible, and I agree you should try and get it close to the front. I have had no issues whatsoever with placement of the sensor on either car of mine.

On the 94 I have the wideband sensor for the DFI right after the driver side header collector (NTK), I also have an Autometer wideband gauge with bosch sensor located right after the y-pipe (so that I get a reading from both banks about mid car). The A/F ratio is always damn close. Put the same car on a dyno and stick a wideband in the tailpipe and again the A/F ratio is no different. I compared a DFI log to the dynojet graph and it was spot on.

I think the main reason to keep the sensor as close as possible is that they need heat in them to operate. All of them are heated but they work better last longer if the internal heater element doesn't have to work as hard.

I guess my point is put it as close to the motor as possible, but also keep it easy to get to and work on, and in a safe location.
red_z28
02-18-2009, 08:38 PM
so do both banks stay close as far as A/F ratio? Or is there a possibility that the bank without the sensor could become lean or rich resulting in power loss or engine damage?
BLOWNDFIZ
02-19-2009, 09:38 AM
so do both banks stay close as far as A/F ratio? Or is there a possibility that the bank without the sensor could become lean or rich resulting in power loss or engine damage?

There is always a possiblity that one bank could go lean or rich (injector issue, plug fouled, etc.). The only way you could keep tabs on each bank simultaneously would be two run two sensors and two gauges.