Hi-Flow Cats?

[BlackWolfLiberty]

I am thinking about adding a hi-flow catalytic converter, it's 2.5 diameter piping correct along with how many o2 sensors on it? one or two?

 

[tjkj2002]

The OEM cats are the highest flowing ones on the market.Those aftermarket ones kinda play hell with the downstream O2 sensors which will mess up your power and mileage along with that nice check engine light.


Oh and all V6 KJ's have 4 O2 sensors.If you have the 45RFE trans you have 3 cats,42RLE trans you have 2 cats.

 

[AlexKJ]

If you have the 45RFE trans you have 3 cats,42RLE trans you have 2 cats.

I'm pretty sure that I have 3 catalytic converters, and I have a 42RLE... Maybe a '02-'03 thing?

Cheers!

 

[BlackWolfLiberty]

Well my issue is I think my Cats are clogged or something, when I give it gas my exhaust sounds like it has a bubble in it.. I have a Flowmaster Dual Setup

 

[long_tall_texan]

Easiest way to tell if cats are bad is to get under your KJ and tap on the cats with a rubber mallet. if you hear anything rattling inside, they are bad. Cats have 8 yr - 80k mile warranty, so maybe you get lucky. I had one replaced on my Suburban at about 79,500 miles - no cost at the dealer.

 

[tjkj2002]

Easiest way to tell if cats are bad is to get under your KJ and tap on the cats with a rubber mallet. if you hear anything rattling inside, they are bad.

In only about 10% of the cases of bad cats does that hold true.

 

[JeepinJarhead03]

troy's right about the aftermarket "highflows" messing with the o2's, have had several that opted to replace downstream cats with the high flow cheaper cats and it ended up burning up the upstream cats

however, those who replaced ALL the cats with the highflows haven't seemed to have any problems with the cats or the o2's

im under the assumption it's a backpressure / flow difference between the OEM and aftermarket cats that causes the problems

 

[tjkj2002]

troy's right about the aftermarket "highflows" messing with the o2's, have had several that opted to replace downstream cats with the high flow cheaper cats and it ended up burning up the upstream cats

however, those who replaced ALL the cats with the highflows haven't seemed to have any problems with the cats or the o2's

im under the assumption it's a backpressure / flow difference between the OEM and aftermarket cats that causes the problems

OEM cats made after about '00 flow better then aftermarket "high flow" cats do.

So yes in a sense the different BP's can be a issue.

 

[incommando]

Hey "Black Wolf..." Welcome back, Dude!rofl2.gifrofl2.gifrofl2.gif

 

[ThunderbirdJunkie]

Welcome to the forum, Black Wolf! Seems like whenever we have a member leave us, there's another to take his spot right away!

OEM catalytic converters flow pretty damn well, so unless you're messing with head/cam improvements, there's no real gain to be made with high flow cats in ThunderbirdJunkie's opinion.

 

[incommando]

I wonder if he is 2wd or 4wd?

 

[ThunderbirdJunkie]

That's a stupid question. Who would buy a 2wd Jeep?

 

[mag03kj]

That's a stupid question. Who would buy a 2wd Jeep?

I did bc it was a quick and cheap buy! Thanks dad!

 

[BlackWolfLiberty]

Sorry dude I don't know who you are referring to, but my Jeep is in my signature line.

Anyways back to the catalytic issue, what if I used some sort of bypass modules for the sensors?

 

[HoosierJeeper]

Welcome, got any pics of your KJ?

 

[BlackWolfLiberty]

Hopefully I fixed it, anyways I don't drive her much she is an 06 with barely 12K miles on her. I have a 6inch BDS Lifted 2007 Dodge Ram 1500 that I normally drive but I love that little jeep!

 

[JeepINgeek]

OMG look its another special edition!

now i dont feel so special.. lol

 

[incommando]

Hopefully I fixed it, anyways I don't drive her much she is an 06 with barely 12K miles on her. I have a 6inch BDS Lifted 2007 Dodge Ram 1500 that I normally drive but I love that little jeep!

Hey...glad to see you survived the storms....


We had another member not long ago who had a black liberty and was getting a lifted Dodge truck. How coincidental. Small world, yes?

Nice pic. Almost looks like it was lifted from some for sale ad on the 'net. Got any more pics of your S.E. in action? Maybe the dual flow masters?

 

[HoosierJeeper]

What tires are on it?

 

[ThunderbirdJunkie]

BWL, do you think you could do us a favor and resize your sig pic?