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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 09-06-2007
countryboy fx4's Avatar
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pop the cat or no?

I have a dual flowmaster 40 series delta flow but I dont know if I should pop the 3rd cat or not. If I do will I run into any problems? Opinions on this
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  #2  
Old 09-06-2007
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No problems... My tone changed slightly on mine....
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  #3  
Old 09-06-2007
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Do it. I will have a custom system built for my truck soon. I will have him take off the last cat which is after the O2 sensor. My muffler will be here tomorrow and it is one that I never seen on a Ranger before, so we'll see how that goes. lol
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  #4  
Old 09-06-2007
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Awesomee so it should sound a lil better ?
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Old 09-06-2007
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I think you will lose low end torque. I lose some just by unbolting my exhaust from behind the cat.
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  #6  
Old 09-06-2007
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^^^Thats completely different than what he is asking....
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  #7  
Old 09-06-2007
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so I will loose power ?
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  #8  
Old 09-06-2007
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I dont understand though if you remove a cat why would you loose power? The exhaust can breathe better no resistance.
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  #9  
Old 09-06-2007
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I noticed no power loss or gain from it, only sound...
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  #10  
Old 09-06-2007
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More back pressure = Usually better low end (stock exhaust/cats)

Less back pressure = Usually better top end, less low end (aftermarket exhaust/cats)
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  #11  
Old 09-06-2007
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Quote:
Originally Posted by greygooseranger
I noticed no power loss or gain from it
My butt dyno is more sensitive than yours. But it is true. With less back pressure the more low end power you lose. But on a turbo charged car the turbo causes enough back pressure that you can run nothing after the turbo and you will get a massive gain in power.
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  #12  
Old 09-06-2007
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Ok, if you say so.... I pull 5500 pounds pretty regularly with my truck and I noticed no low end torque loss whatsoever...
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  #13  
Old 09-06-2007
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Quote:
Originally Posted by 01xltranger4x4
More back pressure = Usually better low end (stock exhaust/cats)

Less back pressure = Usually better top end, less low end (aftermarket exhaust/cats)
This may be true, but only to a point. To max out the low end power of your motor, your not going to want 1 in. pipe and 10 cats.
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  #14  
Old 09-06-2007
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well it doesn't really matter I'm planning on a bama tuner pretty soon so that should make up for the little low end I will loose
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Old 09-06-2007
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Well its up to you. I wouldn't do it just for a different sound especially here in California because its a $1200 or so fine for removing or gutting a cat.
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  #16  
Old 09-06-2007
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Its a fine in every state, but in a state like mine, we don't have emissions testing.... :)
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  #17  
Old 09-06-2007
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Quote:
Originally Posted by greygooseranger
Its a fine in every state, but in a state like mine, we don't have emissions testing.... :)
Lucky
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  #18  
Old 09-06-2007
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I have no cats on my impala and a Hooke cat back system with Clear image Tri-y headers and I have dyno results to prove that opening up the exhaust hepled out my low end torque. Granted new vehicle cats are glorified resonators (with the advent of sequential Fuel injection cars can very easily be low emissions without cats) it really won't make much of a difference whether you have them or not. My Car is 12 years old and had very restrictive cats, that were like pushing exhaust through a shop rag.

BTW no emisions here or wehre I am going!

~HJ
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Old 09-06-2007
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Quote:
Originally Posted by HAZZARDJOHN
I have no cats on my impala and a Hooke cat back system with Clear image Tri-y headers and I have dyno results to prove that opening up the exhaust hepled out my low end torque. Granted new vehicle cats are glorified resonators (with the advent of sequential Fuel injection cars can very easily be low emissions without cats) it really won't make much of a difference whether you have them or not. My Car is 12 years old and had very restrictive cats, that were like pushing exhaust through a shop rag.

BTW no emisions here or wehre I am going!

~HJ
Large displacement motor vs small displacement motor

Quote:
Originally Posted by HAZZARDJOHN
BTW no emisions here or wehre I am going!
Again. Lucky.
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  #20  
Old 09-06-2007
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Quote:
Originally Posted by fddriver02
Lucky
The smell of a catless mustang or camaro / trans am is really a smell to behold IMO. Hear the pipes ring, feel the ground shake and smell it as it goes by... Man I miss the dream cruise already....lol
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  #21  
Old 09-06-2007
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So what are you guys doing to gut your cats? I'd like to knock off the last cat after the o2 sensor, but what's the easiest way to do it?
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  #22  
Old 09-06-2007
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Quote:
Originally Posted by greygooseranger
The smell of a catless mustang or camaro / trans am is really a smell to behold IMO. Hear the pipes ring, feel the ground shake and smell it as it goes by... Man I miss the dream cruise already....lol
My buddy has a 2000 Z28 6speed with no exhaust and WOW. All it has is the header and cat and so tips that point down.. The cat ends right next to your feet so the sound bounces off the ground and up into the car. Awesome. It sounds so mean. It also blows anything from under the car. There is nothing like the sound of a uncorked v8.
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  #23  
Old 09-06-2007
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Quote:
Originally Posted by Oh5Edge
So what are you guys doing to gut your cats? I'd like to knock off the last cat after the o2 sensor, but what's the easiest way to do it?
I'm going to just take it out all together and then the fab shop will just start from there. I think, we'll see.

Oh, and I am going to a real fab shop, so he wont ***** that he cant take a cat off or anything.
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  #24  
Old 09-06-2007
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Quote:
Originally Posted by DerangedPony
I'm going to just take it out all together and then the fab shop will just start from there. I think, we'll see.

Oh, and I am going to a real fab shop, so he wont ***** that he cant take a cat off or anything.
I think I'll just see how it goes for you and then I'll fab something up that bolts in. But with people saying that it changes exhaust tone, in what way? Just resonating more or a deeper tone?
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  #25  
Old 09-06-2007
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I don't recommend removing any emmisions related item but back pressure in the exhaust is never good. Sometimes people misinterpret things like larger pipe = lower pressure so that must be causing the loss of low end torque. I am not going into the dynamics of what causes this loss but removing a cat and relacing it with a pipe the same size as the pipes on either side will not cause a loss in low end torque. However, gutting a cat WILL most likely result in a loss in low end torque.

Removing or disabling the cat will result in higher emmisions under certain conditions and will make the exhaust slightly louder. It will most likely result in no increase in performance due to the better design of todays catalytic converters.
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