Installing an O2 Sensor Bung
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
You should be able to get a muffler shop to weld one in pre cat for pretty cheap.
Also, some people have told me that the post CAT location is fine for getting A/F ratios. Is this true? It would seem that the CAT would mess up the O2 readings, but according to one of the local dyno guys they've measured pre and post CAT without any differences.
Also, some people have told me that the post CAT location is fine for getting A/F ratios. Is this true? It would seem that the CAT would mess up the O2 readings, but according to one of the local dyno guys they've measured pre and post CAT without any differences.
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Previous posts here said .6 to .7 leaner post cat, my Dyno shop said aprx. .3 leaner post cat, they've run both a wide band pre cat and a tailpipe sniffer on the same car.
Tailpipe sniffer showing 13.0 AFR = 12.7 AFR pre cat.
Tailpipe sniffer showing 13.0 AFR = 12.7 AFR pre cat.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
If that's the case then I'm running a bit rich. Thanks for the info.
