Straight pipes on 4.0 - JeepForum.com
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post #1 of 17 Old 03-29-2009, 06:25 AM Thread Starter
jlarsen2
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Straight pipes on 4.0

I just put a straight pipe on my jeep and was wondering what the excessive gas smell could be when i pull it into my garage. What could be the cause???
It smell richer than when i had the aftermarket exhaust on it.

And is this a bad thing or a good thing?

btw it sounds awesome for a I-6


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post #2 of 17 Old 03-29-2009, 07:02 AM
jeep95xj
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its sounds terrible i did it on mine and hated it. do you have a cat? if not thats the answer to your gas smell. also you just cut your gas mileage is half. your motor is dumping a lot more fyel with no back pressure. your plugs and ot sensor wont last long either
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post #3 of 17 Old 03-30-2009, 09:07 PM Thread Starter
jlarsen2
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yeah i have a cat but i have not nopticed a severe drop in gas mileage...it was already bad pushin around 13 mpg

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post #4 of 17 Old 03-30-2009, 09:15 PM
4.7stroker
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Put a muffler on that rig, it needs some back pressure to operate properly.
I know you want the whole world to hear you driving down the street but honestly you are not going to impress anyone with a rig that sounds like azz.

Dwayne
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post #5 of 17 Old 03-30-2009, 09:26 PM
sprngrider
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A muffler delete is a little different than a straight pipe or test pipe. With a test pipe, you delete the cat, which is bad. A muffler delete is fine and will not cause any mech. problems, but the noise would be too loud for me.

The smell could come from running a little richer because of less back pressure.
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post #6 of 17 Old 03-30-2009, 10:30 PM
bryris
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A muffler delete? Cat delete? Too funny.

1995 YJ Sahara
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post #7 of 17 Old 03-31-2009, 02:38 AM
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Not posting something worthwhile... Too funny.
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post #8 of 17 Old 03-31-2009, 03:48 AM
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pointless arguments that make me laugh... priceless
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post #9 of 17 Old 05-07-2009, 04:25 PM Thread Starter
jlarsen2
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suprisingly it does get better the only down side it that it pops if you punch it in either First or sencond gear. what could that be???

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post #10 of 17 Old 05-07-2009, 08:59 PM
jeep95xj
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To much fuel. Very simple solution. If you want more noise and a little more power go with a high flow cat and a good muffler. Your neighbors and local cops will love you for it. A 4.0 is not a performance motor and doesnt sound good with "open headers" and or no muffler.
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post #11 of 17 Old 05-07-2009, 09:14 PM
sprowley
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Quote:
Originally Posted by 4.7stroker View Post
Put a muffler on that rig, it needs some back pressure to operate properly.
I know you want the whole world to hear you driving down the street but honestly you are not going to impress anyone with a rig that sounds like azz.

Dwayne
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post #12 of 17 Old 10-03-2012, 05:30 PM
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Would it sound like crap on a 87 jeep Comanche, I thought about because it has a lope at idle. I always thought it would sound good to cut the muffler and leave the cat.
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post #13 of 17 Old 10-03-2012, 05:42 PM
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the CAT does provide some back pressure and muffling. Not sure how much on a Jeep, but on an 06 mustang GT I ran no mufflers for the whole 2 years, perfectly fine, sounds good, not obsurd. removing the cat or running a Hi-flow cat will make it stupidly obsurd and you should be shot.

When I switched my 2.5L to a new header, I had a 4" gap I needed branched between the downpipe and the cat -> muffler, sounded like a top fuel lawn mower.

93' YJ 2.5L, 4.88's, 8.8, E-Locker & LSD
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post #14 of 17 Old 10-03-2012, 06:21 PM
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Quote:
Originally Posted by mrdeath2000 View Post
the CAT does provide some back pressure and muffling. Not sure how much on a Jeep, but on an 06 mustang GT I ran no mufflers for the whole 2 years, perfectly fine, sounds good, not obsurd. removing the cat or running a Hi-flow cat will make it stupidly obsurd and you should be shot.

When I switched my 2.5L to a new header, I had a 4" gap I needed branched between the downpipe and the cat -> muffler, sounded like a top fuel lawn mower.

-Matt

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post #15 of 17 Old 10-04-2012, 06:32 PM
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Quote:
Originally Posted by mrdeath2000 View Post
the CAT does provide some back pressure and muffling. Not sure how much on a Jeep, but on an 06 mustang GT I ran no mufflers for the whole 2 years, perfectly fine, sounds good, not obsurd. removing the cat or running a Hi-flow cat will make it stupidly obsurd and you should be shot.

When I switched my 2.5L to a new header, I had a 4" gap I needed branched between the downpipe and the cat -> muffler, sounded like a top fuel lawn mower.
Im running a 4.0, not a 2.5. So i think it would sound better than that.
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