O2 Bung for Oxygen Sensor Position ?

[Road Grabber]

I'm about to use a Fast system to monitor air/fuel ratio and need some advice on locating the O2 sensor bungs.

If anyone has a bung design type they used to suggest I'd appreciate it.

Some bungs are stepped and others aren't but have a slight radius to fit better against the pipe before welding.

My exhaust is a stock HP manifold on a 440. I heard it's better to get the sensor close to the manifold? I was thinking of placing the sensor on the vertical portion of the pipe coming off the manifold.

 

[493 Mike]

I'm about to use a Fast system to monitor air/fuel ratio and need some advice on locating the O2 sensor bungs.

If anyone has a bung design type they used to suggest I'd appreciate it.

Some bungs are stepped and others aren't but have a slight radius to fit better against the pipe before welding.

My exhaust is a stock HP manifold on a 440. I heard it's better to get the sensor close to the manifold? I was thinking of placing the sensor on the vertical portion of the pipe coming off the manifold.

Good spot.
Mike

 

[6PKRTSE]

Use the bungs that are perpendicular to the pipe (90 degrees) and make sure where you located them has enough room for the sensor and lead to come off of it between the frame rails or torsion bars. I original used the 45 degree bungs to point the sensors away from any clearance issues. However, we found out on dyno that I was getting false readings due to the 45 degree bungs cause the sensor to hang too far out of the pipe. Or, one has to cut the 45 degree bungs way down in length, but we didn't think that was even going to be enough.

 

[BeepBeepRR]

Not sure if the Fast system has the same requirements. But here is a Holley video.

 

[Road Grabber]

Use the bungs that are perpendicular to the pipe (90 degrees) and make sure where you located them has enough room for the sensor and lead to come off of it between the frame rails or torsion bars. I original used the 45 degree bungs to point the sensors away from any clearance issues. However, we found out on dyno that I was getting false readings due to the 45 degree bungs cause the sensor to hang too far out of the pipe. Or, one has to cut the 45 degree bungs way down in length, but we didn't think that was even going to be enough.

Thanks for that heads up

 

[Road Grabber]

Not sure if the Fast system has the same requirements. But here is a Holley video.

Useful. Thanks