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O2 Sensor Placement?

Posted: Sat Dec 18, 2010 7:37 pm
by NOVALOU
I just bought a RPM Performance data logger and I'm in the beginning stages of the install. Could you guys tell me where do you have your O2 sensors at in your exhaust? The instructions say to put it 8" from the head exhaust flange. I'm wondering if I'll get a bad reading if I put it in the header extension. I already have a bung there because that is where the guys at the chassis dyno told me to put it.

Re: O2 Sensor Placement?

Posted: Sun Dec 19, 2010 5:15 am
by CDR Performance
It need to be in the top half of the pipe from 9 o'clock to 3.
If you do not have a full exhaust it must be several feet from the end of the pipe or reversion and fresh air will create false readings on the meter.

Re: O2 Sensor Placement?

Posted: Sun Dec 19, 2010 2:43 pm
by NOVALOU
Oh well, that's what I was afraid of. Thanks for the reply.

Re: O2 Sensor Placement?

Posted: Mon Dec 20, 2010 5:41 am
by CDR Performance
Just add another bung, they are cheap $6. or something.

Re: O2 Sensor Placement?

Posted: Mon Dec 20, 2010 7:24 pm
by lightning-jr
The wideband Bosch sensor I installed (LSU4.2) is mounted just downstream of the collector.
This is with a full length exhaust.

My inquiries to Innovate resulted in a recommendation of 36-48" from the head, backed with infrared temp measurements.

Innovates major concern seems to be that the sensor is not exposed to temps in excess of 900*F which will fry the poor thing.

Re: O2 Sensor Placement?

Posted: Thu Jan 13, 2011 6:19 am
by bracketracer
Not true it won't fry.....
If you have a slip on collector and an O2 after that you will also get false readings also with a leaky header gasket...
I prefer about 10" up from the collector...
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Re: O2 Sensor Placement?

Posted: Thu Jan 13, 2011 7:36 pm
by NOVALOU
I installed mine 14" up from the exit on the header extension. I haven't ran the motor yet, but from what I've been hearing is the only down fall to this is a possible false reading at idle.

Re: O2 Sensor Placement?

Posted: Fri Jan 14, 2011 4:43 am
by CDR Performance
You may have to install an extension to the head so the O2 does not see fresh air.
As for heat we run them 18" from the turbos on motor making 1500 hp +.