Sensor location for Wideband air / fuel and EGT - Pyrometer

[SuperSamuri]

I have ordered a Speedhut Wideband air fuel ratio gauge and sensor for a L6 Turbo setup with a Holley Blowthrough Carb and intercooler.

Question is about location of the sensor in the 2.5" exhaust downpipe, considering I may install a EGT / pyrometer gauge at a later point.

 

I have read 12 inches from turbo exhaust outlet for the Wideband?

and

As close to turbo exhaust outlet for the EGT / Pyrometer?

 

Any advice appreciated.

 

[RB26powered74zcar]

I moved my LM1 wide band sensor down from aprox 12" to aprox 30" after I kept getting ego heater over heating errors.

 

My egt probe is aprox 2" from my exhaust ports.

[Six_Shooter]

Here are a couple pictures of my exhaust showing the O2 location. The bungs are approx 2' after the turbo. I put the WBO2 in the front bung and a NBO2 bung (Stock for the ECM I am using).

 

 

Edited April 25, 2014 by Six_Shooter

[SuperSamuri]

Thank you Six_Shooter and RB26powered74zcar.

Exactly the info I was looking for before drilling holes and welding my exhaust, appreciated

[TimZ]

Thank you Six_Shooter and RB26powered74zcar.

Exactly the info I was looking for before drilling holes and welding my exhaust, appreciated

For the EGT, it's generally preferable to put the probe before the turbine inlet, rather than after the turbine in the downpipe.  The turbo can take several hundred degrees out of the exhaust temp, depending on what it's doing at the time.  You'll get more consistent readings before the turbine.  Closer to the exhaust ports is better still.

[Enginerd81]

My LM1 wideband is in the same spot as Six-Shooters. Tim is right on the EGT it should be as close to the ports as you can safely get.