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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 08-25-2005
jerrod07's Avatar
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bye bye cats

has anyone ran with no cats... just a flowmaster 40? thats what i'm doing but with a glasspack and it sounds mean but i bet the flowmaster has some bit.
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Old 08-25-2005
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and what exactly are u accomplishing by npot running any cats?
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Old 08-25-2005
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taking the cats off should only make the exhaust louder and stinkier. Performance wise you will also lose low end torque because the cats create needed back pressure. Your top end might improve slightly, but Ranger cat's are high flow and really dont give much exhaust flow restriction...i say its a better idea to keep them on unless all you're after is loudness.
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Old 08-25-2005
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Quote:
Originally Posted by jerrod07
has anyone ran with no cats... just a flowmaster 40? thats what i'm doing but with a glasspack and it sounds mean but i bet the flowmaster has some bit.
02 sensors should be all pissy without. Jus generally a bad idea.

Aaron
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  #5  
Old 08-25-2005
D.
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I give you all of 15 seconds of runtime before it shuts down when ya pull your cats. If it continues to run, its going to run like dung.

To pull those cats, your going to have to bypass all the o2 sensor readings.. chip? ' dead' o2's ( fakes/cheaters ) .. quite a bit of money to gain nothing.

D.
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Old 08-25-2005
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Put a turbo charger on there and you'll really start to feel the gains of not having the cats (aka exhaust restrictions) on there. :D

Depends on your application and engine, but has anybody actually dynoed this engine with and without cats to see what happens when you remove them? From my experiences removing cats was generally a performance booster, even in N/A engines. While it may hurt TQ slightly the net effect was a positive.
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  #7  
Old 08-25-2005
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backpressure is not needed, its exhaust gas volecity that is...

turbo applications are a totally different topic...

running no cats is not only stupid but illegal and ignorant. modern day catalyic converters are a really good flowing design and dont restrict the exhaust much.
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  #8  
Old 08-25-2005
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Quote:
Originally Posted by jrodhotrod
Put a turbo charger on there and you'll really start to feel the gains of not having the cats (aka exhaust restrictions) on there. :D

Depends on your application and engine, but has anybody actually dynoed this engine with and without cats to see what happens when you remove them? From my experiences removing cats was generally a performance booster, even in N/A engines. While it may hurt TQ slightly the net effect was a positive.

did you miss the posts about teh 02 sensors?

it's wise to just leave the 5 million cats we have on our rangers, alone...
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Old 08-25-2005
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I dont have any cats. :)
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  #10  
Old 08-25-2005
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Quote:
Originally Posted by FoMoCoEdge
I dont have any cats. :)
and the exhaust has made you retarded...








served.
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  #11  
Old 08-25-2005
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Quote:
Originally Posted by SUPERGILDO
and the exhaust has made you retarded...








served.

Almost.. :) Still smarter than you.
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  #12  
Old 08-25-2005
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Quote:
Originally Posted by optikal illushun
backpressure is not needed, its exhaust gas volecity that is...

turbo applications are a totally different topic...

running no cats is not only stupid but illegal and ignorant. modern day catalyic converters are a really good flowing design and dont restrict the exhaust much.
With this I agree. The performance gain that you will see with taking out the cats it isn't worth it on the street. That and its a whole lot healthier for the environement.

As for the turbo, you lose TQ when you free up restrictions in the exhaust because of a loss of backpressure, but turbos make torque so the less backpressure the better to keep those gasses flowing :D
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  #13  
Old 08-25-2005
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again i said turbo is different and another topic. i dont know much bout turbos but i know enough about exhausts to tell what and wont work. but yes, for N/A leave em on.

best exhust for a turbo is exit right after the front wheel :)
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  #14  
Old 08-25-2005
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Quote:
Originally Posted by optikal illushun
best exhust for a turbo is exit right after the front wheel :)
Yup! Too bad that's a little loud for the street he he.

anyways... end threadjack, back on topic...
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  #15  
Old 08-25-2005
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my 460's exhaust exits behind the front wheels... sorta...

it is def. too loud.

no turbo, of course.
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  #16  
Old 08-25-2005
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I have my last one hollowed out, but it didn't become any louder either, just a waste of time...

Brenton
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  #17  
Old 08-25-2005
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my truck sure doesn't feel like it lost torque. if anything it helped my acceleration . and i don't get that annoying popping nose from my exhast anymore . just a beefy grumble.i was just wondering what the flowmaster would sound like.o and my sensors didn't even through my engine light. or affect my mileage.
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  #18  
Old 08-25-2005
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Quote:
Originally Posted by jerrod07
didn't even through my engine light.
Give it time. The Catalyst Monitor has a certain set of conditions that must be met for it to complete and light the CEL. When it does you will probably have a code P0420.
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  #19  
Old 08-25-2005
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well i've gone 500 miles with no prob
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  #20  
Old 08-25-2005
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lol 500 miles is nothing...it akes the ecu about that much to fully adjust.
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