cat delete issues?

[bfreehill]

Finishing up a chump / LeMons car and I have replaced the cat with a straight pipe.
Anyone have issues with the second 02 sensor reading or should I be ok?

[zx2Dirttrackracer]

Have a stright pipe in place of my cat in my enduro car for the last 3 years. No problems

[only S/R]

even if you do, go to azone and get the 18mm spark plug non foulers, work great

[zxtwou2]

even if you do, go to azone and get the 18mm spark plug non foulers, work great

yes and no...jeremy had horrible luck doing that. best thing to do, put a resistor in line to get rid of the CEL....as far as adjusting your A/F ratio, the first sensor does that, and the second sensor simply gives you a CEL saying your cat is bad.

[only S/R]

yes and no...jeremy had horrible luck doing that. best thing to do, put a resistor in line to get rid of the CEL....as far as adjusting your A/F ratio, the first sensor does that, and the second sensor simply gives you a CEL saying your cat is bad.

i and many others have had 0 issues, its an option to look into, and its about 5 bucks to do

[yellow2000S/R]

even if you do, go to azone and get the 18mm spark plug non foulers, work great

It works and I'm a tard haha.

I've just used the resistor/cap trick on my dads car, been good for 15k+ miles.

[bfreehill]

So I averaged about 10 MPG over 686 WOT race miles without the cat.
maybe I should unplug the second O2 sensor?...

Thought Id get more like 18-20 mpg.

[madmatt2024]

lol. I would be surprised if you got even 15 mpg running like that. If you are going WOT in a race situation don't expect good mileage. Either trick the o2 or leave it alone. You are still going to get a code with it unplugged so don't even bother.

[zxtwou2]

i think 10mpg on the track is about what iceracer and trekkor have gotten.

[only S/R]

10 mpg on track sounds great

[Jackbauer]

and the second sensor simply gives you a CEL saying your cat is bad.

In fact, some people affirm that the rear O2 sensors actually do affect fuel trim as a fine tune, improving accuracy in the mixture and performance of the cat...

http://forums.bimmerforums.com/forum...t-1519895.html

Dont know if it applies also to the ZX2...

[zxtwou2]

it doesn't apply to the zx2. the zx2 has one bank of o2 sensors...front and rear, but still one bank. it's not wideband, and it's not dual bank.

[bfreehill]

i think 10mpg on the track is about what iceracer and trekkor have gotten.

OK thanks for the feed back...