baxj89

I have an 89 cherokee its stricktly a trail rig ...... if I cut my catalytic converter off will it cause me any problems with how my renix runs will it give me any more power ??????

Gee oh Dee

It will be the exact same as before. So id just leave it on, trail rig or not.

I've also got a Renix.

BlueXJ

X2

TheDale

BS, you will get more power out of it, The old Catalytic converters are VERY restrictive, not like the new ones. The one's on new cars, are 20x better than the old cats.

If you do take it off, you might lose a little bit of torque, but you will gain some HP. The best bet would be to get a High performance cat and replace it.

On trail only rigs, I really don't like running cats at all, because they get super hot, that's what they do, they burn the leftover gases that come out of the engine. But it is very illegal.

Their are SO many arguments back and forth about it, but you ARE better off just leaving it on. The main reason I leave mine on, is when i'm crawling, having a cat ON helps keep the poisonous fumes to a minimum. Without it, the exhaust REALLY stinks and can make you sick.

Gee oh Dee

Until someone comes up with a dyno run proving otherwise, ill stick with the fact that the 4.0 motor really doesn't put out enough flow to make a cat removal a HP gain.

MAYBE one extra HP, but you wont feel or gain anything at all with it's removal.

outkast

Wow, just wow. They do not burn anything. It is a chemical reaction that takes place when the NOX and other gasses pass over the gold/platinum/paladium coated ceramic plates. DPF's on diesels burn particulate but only on newer trucks and that is done by injecting fuel into the exhaust stream.

The benefits simply do not out weight the negatives.

It is illegal and against forum rules for it to be discussed here so leave it at that.

TheDale

read my post, I advised him to leave it back on.

If it is against forum rules to discuss what a catalytic converter does then ban me. People need knowledge not just a "leave it on" answer.

"outkast" burning is a Chemical reaction also. Cooking your food is a chemical reaction. Catalytic converters can get an internal temp of around 1600 degrees.

If you guys wanna argue this, I can do it all day long.

In the end, their are more cons than pros to removing a cat.

And it is NOT illegal to run without a catalytic converter on a off-road only vehicle. If it is street legal, it needs a cat.

Radar

My two cents, as far as gas mileage goes with no cat, on my renix I've gotten 19 mpg highway by driving nice and easy at 55mph so it certainly won't hurt your wallet.
When i bought my Renix the guy had already taken it off and theres no point in me buying one cause i live in FL and theres no emission testing here.

Gee oh Dee

Im not trying to argue. I just want proof of this huge HP and MPG gain with it gone, that's all.

Everyone claims this and that, still no solid facts. No proof.

If you got a MPG gain, howdo you know the cat wasn't clogged? If you never ran with it, how can you compare your MPGs? How do you know something else has been altered?

And to be honest, cats DO get really hot. Hot enough to potentially cause a problem. However I have yet to see anyone on here burn up cuz their cat bumped a leaf or some grass.

TheDale

You're blowing it way out of context, I never said a HUGE gain, you might gain a little bit, 10hp, but you will also lose torque. AND create poisonous gases.

outkast

Discussing how they work is not against the rules as far as I know, it is against forum rules to discuss removing them. Tons of threads get locked for it. Just sayin.

But your right burning is a chemical reaction, just not the one that applies to the converter. And yes they get hot as hell from the chemical reaction and the fact that there is 1000* exhaust gasses going through it.

Gee oh Dee

I still want to see a neutral test on a dyno, , cat vs no cat.

Modestmike

I too would like to see it. I have a feeling once people realize how little they will gain, this topic would be less likely to pop up.

Gee oh Dee

Im willing to bet, IN CONCERN TO THE 4.0L JEEP MOTOR, a 10hp gain would be the high extreme. 5hp is probably the realistic highest gain I'd guess. 3-5hp at most.

baxj89

Thanks for all the advice and info wasn't trying to start world war 3 on the discussion board I hear all this talk about how a renix is diferent I just wanted to make sure that IF the converter came off it would still operate the same or if it would help it but thanks for the info guys