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December 4th, 2016, 07:01 AM   #1
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What to do with O2 sensor w/aftermarket exhaust?

Just picked up a '10 FE570 that has a full Ti exhaust. I found the O2 sensor covered with a rubber plug and taped up zip tied to the front frame rail
Obviously with no bung for it in the Ti FMF exhaust they had to do something.

But should I do something else with it... Like remove it completely? Or what?
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December 5th, 2016, 12:30 AM   #2
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FWIW

Well the 02 sensor reads the exhaust and adjusts everything accordingly to what it reads. Now if the 02 sensor is not reading correctly it will adjust and give improper signaling and the system will not run correct. I would have a hole drilled into the pipe and weld a nut to allow the 02 sensor to be put back into the system.

If somehow someone figured out how to lock a specific map into the ecm ????? Don't know how it would be done with the 02 sensor still hooked up??? then it would be fine. however if the system is running a closed loop than it requires the sensor to give the correct fueling. More than likely it will run rich as the sensor is reading super clean as no fuel burn. If for some reason it decides to run lean, you could burn a hole through the piston like a cutting torch.

So funny how people muck with stuff they don't understand??? I see so many people run custom exhaust on cars and remove the 02 sensors thinking they will get more performance??? They are put there for a reason.

It wont run to max performance or spec without it.
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December 5th, 2016, 02:05 AM   #3
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I also have fmf header and just removed o2 sensor from the bike (had it custom mapped on dyno later).
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December 5th, 2016, 09:16 AM   #4
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I did a bit of Air Fuel Ratio (AFR) testing on my 2009 570 in stock form with lambda probe disconnected, and I found the actual fuel map to be quite good, so in my opinion theres no downside disconnecting it, no error code will be thrown either. AFR was right around 13:1 in any position, tad rich on wot but not below 12:1, i.e wont affect power imo.
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December 5th, 2016, 10:14 AM   #5
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So should I leave the plugged and covered o2 sensor hooked to the harness or buy one of those lamda plugs?
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December 5th, 2016, 10:21 AM   #6
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Id disconnect the lambda and plug or seal the connector.
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