Thread: Eliminating KR - I think I see the problem?

Is it kosher to put a wideband after the cat in the rear O2 bung? I see a lot of mixed opinions.

i find it ok to install it there, where mine is.

i just went over his tune, he was missing a tune pretty much. sent a new tune, pretty sure i might be his new hero lol

The location after the cat is okay, just not putting it after the cat itself isn't.

The cat converter at part throttle can skew wideband readings and make it slower to respond than if it was infront of the cat. At WOT after a second or so of delay "should" still show very close AFR readings to a wideband in front of the cat because the cat converter isn't doing **** to the gases when there is so much flowing through it at once. They are not designed to work good at full throttle, that's why they need to flow lots of air and not be a restriction. Idle and part throttle is where the cat is doing all it's work.

That is why when tuning with a wideband it should be infront of the cat to prevent skewing/problems.