Good day by lukester - March 28th 2024 12:26 pm
| Crazy mods by MufflerMan Mike - March 28th 2024 9:38 am
| | Lew Greger by MufflerMan Mike - March 27th 2024 5:15 pm
| | | Re: Gutting a cat? | Joined: Jul 2011 Posts: 969 Likes: 1 old hand | old hand Joined: Jul 2011 Posts: 969 Likes: 1 | I just replaced mine with a new performance high flow cat and muffler and kept the stock exhaust lines, it is all 3". Once it was all done she sounds really good! Nice and subtle but meaty, not so droning especially on road trips. Pisses off people in Prius' too! Due to the emissions laws in Vegas, I have to have the cat. Otherwise i'd just cut it off. I'm quite happy with it and I've increased my performance and MPG's enough to notice it. Maybe 10-20 HP overall and 1.3 MPG's. I now average 19.6 which is pretty awesome for a V8 powered brick. Here's a video, if you've got a subwoofer on your computer, crank that beast up, it really sounds good! With the exception of the little bit of wind. http://www.youtube.com/watch?v=fvVq2-UQ-fw&feature=youtu.be
Gone vannin' I'll call you later.
| | | Re: Gutting a cat? | Joined: May 2007 Posts: 9,854 Likes: 8 Festerus Vannimus | Festerus Vannimus Joined: May 2007 Posts: 9,854 Likes: 8 | Sounds nice, what muffler are you running on you van AFTOYBOY ?
My van : 1989 Ford E-150 Econoline, currently named “WOLF-DEN IIâ€
Founder & President of Sooner or Later United Truckers and PROUD TO BE A S.L.U.T. ! !
| | | Re: Gutting a cat? | Joined: Feb 2012 Posts: 645 addict | addict Joined: Feb 2012 Posts: 645 | Removing a CAT can improve up to 15% highway mileage. One of my engineering professors told me this as we were discussing fluid flow in the exhaust. I can say that after I removed my CAT I saw a slight improvement in mileage. However, I did not spend allot of time logging fuel and miles from the time I removed my cat to the time I rebuilt my engine.
I can say, the thing accelerated better at higher speeds, I wasn't using as much fuel. But I cannot give an exact number.
Removing a restriction will help the engine get better mileage. It will also help increase horsepower by moving the peak torque slightly higher. In a computer controlled application, removing the cat will kill throttle response. Advancing the timing by as little at 4 degrees and by clearing all adaptives in the computer will bring back throttle response and will bring peak torque down to a more lower-mid range rpm. However an increase will be seen across the entire RPM band.
Anyways. This is just my 2 cents. | | | Re: Gutting a cat? | Joined: Jul 2011 Posts: 969 Likes: 1 old hand | old hand Joined: Jul 2011 Posts: 969 Likes: 1 | It's a chinese off brand muffler, can't even pronounce the name of it but with the install professionally done and welded (I don't have a welder) cost me 280 bucks for all the work. I couldn't be happier. She definitely has better pickup and it doesn't sputter when it's cold anymore cat was clogged but I also tuned the TBI with a rebuild kit and complete cleanup. purrs like a kitten now. Replacement of the cat really makes a difference in these older rigs.
Gone vannin' I'll call you later.
| | | Re: Gutting a cat? | Joined: Feb 2012 Posts: 645 addict | addict Joined: Feb 2012 Posts: 645 | Removal of cat is even better. Glad to hear it is all fixed. 280 seems high, I would usually charge like 50-100 bucks. Well, you live in NV so yea 280 seems normal. :P | | | Re: Gutting a cat? | Joined: Jul 2011 Posts: 969 Likes: 1 old hand | old hand Joined: Jul 2011 Posts: 969 Likes: 1 | The high price was due to the cat, they didn't have anything other than their most expensive cat that would fit 3". In the beginning I was going to do the exhaust myself but after I butchered and failed I said forget it. I'll have it done right the first time. I can't complain at all though.
Gone vannin' I'll call you later.
| | | Re: Gutting a cat? | Joined: May 2007 Posts: 9,854 Likes: 8 Festerus Vannimus | Festerus Vannimus Joined: May 2007 Posts: 9,854 Likes: 8 | Removal of the cat IS great for sound, and MAYBE performance, but when you live in a emissions state like the OP, the up to $10,000 dollar fine from the feds for tampering with emissions equipment just does not cover the gains you might get.
When I went to Wyotech, we put a 350 V8 on the dyno with stock exhaust manifolds , 3" pipes and flowmaster series 50 mufflers to the test, then retested with 3" high flow cats added to the mix and it did not lose one hp or foot pound of torque. With stock type cats, yes there was some lose, but not with high flow cats.
Just not, to me, worth the risk in a emissions state on a van that gets tested.
My van : 1989 Ford E-150 Econoline, currently named “WOLF-DEN IIâ€
Founder & President of Sooner or Later United Truckers and PROUD TO BE A S.L.U.T. ! !
| | | Re: Gutting a cat? | Joined: Feb 2012 Posts: 645 addict | addict Joined: Feb 2012 Posts: 645 | I remember a time when done right the first time meant to do it oneself, but you said you do not have a welder, so I guess you are right.
Ah, that would explain the price. I did see some universal catalytic converters in the Jegs catalog. I think they are 79 dollars. | | | Re: Gutting a cat? | Joined: Feb 2012 Posts: 645 addict | addict Joined: Feb 2012 Posts: 645 | That is true. Luckily I do not live in an emissions state. That and I am exempted due to the weight of my vehicle.
Was that a stock 350? | | |
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