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Author Topic: Does removing the cat do anything?  (Read 3434 times)

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Offline andpgud

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Does removing the cat do anything?
« on: August 30, 2011, 06:43:30 AM »
Hi there guys. Does removing the cat on the exhaust give any gain on the 4banger?
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RT

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Re: Does removing the cat do anything?
« Reply #1 on: August 30, 2011, 09:01:47 AM »
no, putting a performance cat on it does though, without the whole illegal as hell thing too
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Offline grumpygy

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Re: Does removing the cat do anything?
« Reply #2 on: August 30, 2011, 11:28:00 AM »
On Mine it did, but mine was plugged. :slapfight:  Putting on a new header on back now and will be putting in a cat again.
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline jfrabat

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Re: Does removing the cat do anything?
« Reply #3 on: August 30, 2011, 04:15:38 PM »
In reality, it depends on what cat you have and what condition it is on.  If you have an old and clogged cat, it will make a HUGE difference.  If you have a fairly new high flow cat, it will make little difference (although still SOME difference).  IS it worth it?  Not really, as, if you run your Jeep in the US, it is illegal to run without a cat.  Same here in CR, but I am considering loosing mine because it IS legal in Panama to run without a cat.
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost

Torch_Ind

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Re: Does removing the cat do anything?
« Reply #4 on: August 30, 2011, 04:58:50 PM »
Quote from: jfrabat on August 30, 2011, 04:15:38 PM
In reality, it depends on what cat you have and what condition it is on.  If you have an old and clogged cat, it will make a HUGE difference.  If you have a fairly new high flow cat, it will make little difference (although still SOME difference).  IS it worth it?  Not really, as, if you run your Jeep in the US, it is illegal to run without a cat.  Same here in CR, but I am considering loosing mine because it IS legal in Panama to run without a cat.

same in Canada illegal
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Offline andpgud

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Re: Does removing the cat do anything?
« Reply #5 on: August 31, 2011, 01:58:03 PM »
My car is a 2001 TJ and it runs like it has no power. Maybe it is clogged, thats why I am considering this.
I am having problems getting to 60. It takes long as hell.
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Offline sharpxmen

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Re: Does removing the cat do anything?
« Reply #6 on: August 31, 2011, 03:12:36 PM »
Quote from: andpgud on August 31, 2011, 01:58:03 PM
My car is a 2001 TJ and it runs like it has no power. Maybe it is clogged, thats why I am considering this.
I am having problems getting to 60. It takes long as hell.


most likely that's the reason but you can't be sure, however if it was a lack of fuel you'd be getting a CEL due to too lean mixture error. just buy a $50 universal and throw it on there.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
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Torch_Ind

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Re: Does removing the cat do anything?
« Reply #7 on: August 31, 2011, 03:35:58 PM »
Quote from: andpgud on August 31, 2011, 01:58:03 PM
My car is a 2001 TJ and it runs like it has no power. Maybe it is clogged, thats why I am considering this.
I am having problems getting to 60. It takes long as hell.


take out your #1 O2 sensor run it with it hanging in the wind for a quick run around the block and see if you pick you some power.. cheep way of seeing if it's your cat being plugged   
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Offline andpgud

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Re: Does removing the cat do anything?
« Reply #8 on: August 31, 2011, 04:20:46 PM »
But is it possible after 40k?
Well, the car sits over the winter in the garage. Maybe thats why
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Offline sharpxmen

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Re: Does removing the cat do anything?
« Reply #9 on: August 31, 2011, 05:07:44 PM »
Quote from: andpgud on August 31, 2011, 04:20:46 PM
But is it possible after 40k?
Well, the car sits over the winter in the garage. Maybe thats why

40k would be enough, what happens is sometime they break inside and plug the output of the cat and not necessarily that the honeycomb is plugged.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline andpgud

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Re: Does removing the cat do anything?
« Reply #10 on: September 01, 2011, 03:54:32 AM »
When you say honeycomb, you mean the cat?
The 4 banger isnt that slow right?
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Offline neale_rs

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Re: Does removing the cat do anything?
« Reply #11 on: September 01, 2011, 09:28:24 AM »
It depends on the gearing and tire size.  What are you currently running?
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline andpgud

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Re: Does removing the cat do anything?
« Reply #12 on: September 01, 2011, 09:44:27 AM »
I am running stock gears with 225/70/16 tyres
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Offline neale_rs

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Re: Does removing the cat do anything?
« Reply #13 on: September 01, 2011, 10:44:01 AM »
It must be something else then, with stock tires the 4 banger is not bad at all.
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'95 YJ, 33 x 12.5 mud tires, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline andpgud

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Re: Does removing the cat do anything?
« Reply #14 on: September 01, 2011, 11:44:50 AM »
Hehe. It must be the cat then. Nothing has been done to the exhaust. Just changed the spark plugs with cables and all the filters. Nothing changed and I was WTF
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