S197steve

I currently have a stock exhaust except for the Corsa's but I'm planning on going cat-less in the very near future. My GT is my daily and while I wouldn't mind dropping the $$ on a built shortblock, I don't have the luxury of a backup car for the time the GT would be down.

I'm hoping to install a cat-less xpipe in the coming weeks... cats scare me.

moosestang

Going to try and pull my cats out tomorrow to inspect. I'm seeing 15-16% LTFT on both banks under slight throttle. I don't remember it being that high and the car feels a little sluggish in closed loop. It still feels like I have full power at WOT though. With even partially clogged cats, I'd think there would be a noticeable drop in power.

Maybe the bad COP's fouled my 02's.

06mach1

Is that positive or negative fuel trim. Plug cats are usually noticed as you put more load to an engine, at least on a NA engine. With FI, the supercharger may be forcing it thru the cats instead of flowing thru them.

JIM5.0

I would sure hope that no one was behind you as all that shot out from behind your car.

http://www.youtube.com/watch?v=B4K5TXbBroE

808muscle

How long have you have you been running the cats with the whipple?

moosestang

Positive.

moosestang

21,000 miles and over 3 years.

06mach1

positive LTFT means that your engine is running lean at that point. The ecm is trying to richen the mixture so it is increasing the amount of fuel to the engine. Remember that your front O2's are what adjust the LTFT. Not sure what, if anything a plugged cat would show on the front O2 reading.

Lifter583

[QUOTE=JIM5.0;7322171]I would sure hope that no one was behind you as all that shot out from behind your car.

http://www.youtube.com/watch?v=B4K5TXbBroE[/QUOTE

no there wasnt ...quite the poor bast*** behind the elephant LOL!!

808muscle

Wow, that would scare me. What brand?