where should i place a second O2 bung for tuning...
 

im running obd1 and i wanted to know what is the best position for a second O2 bund for tuning purposes, would it be better to have it after the primary oxigen sensor or before it, and does the distance between them make any difference? ???

Re: where should i place a second O2 bung for tuning...
 

Best place for the wideband is about 12"-18" after the turbo. Doesn't really matter where it is relative to your stock O2. On a previous setup I had my stock O2 in the HF manifold, then the wideband O2 was installed in a bung in the downpipe about 15" after the turbine.

Re: where should i place a second O2 bung for tuning...
 

k, thanks jon

Re: where should i place a second O2 bung for tuning...
 

distance from the turbo above is good. you want to keep it away from the heat of the turbo (you can aslo build a copper heat sheild). but you also want to make sure it's not at the bottom of the pipe. condensation could collect and ruin the sensor. so make sure it's on a semi vertical pipe or about the halfway point of a horizontal pipe.

-Luke

Re: where should i place a second O2 bung for tuning...
 

I have mine ~6 inches from the turbine. It's a bit close, but I think it will work after I put a heat shield around it. I'll also be wrapping everything to keep the heat in the pipes.

Make sure you put it between 9 and 3 o'clock if the pipe is horizontal.

Re: where should i place a second O2 bung for tuning...
 

this is the most important part. if you mout it below 3/6 on the clock you risk excecssive moisture and premature sensor failure