Vanning.com logo
Boxdin
Site Navigation


Advertisements
Recent Posts
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
1987 G20 Gypsy
by SDMickey - March 25th 2024 9:39 pm
Featured Links


Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 3 1 2 3
Re: Gutting a cat?
PonyPete #646984 December 29th 2013 8:26 pm
Joined: Jul 2011
Posts: 969
Likes: 1
old hand
Offline
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?
PonyPete #646991 December 29th 2013 9:57 pm
Joined: May 2007
Posts: 9,854
Likes: 8
U
Festerus Vannimus
Offline
Festerus Vannimus
U
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 II”


Founder & President of Sooner or Later United Truckers and PROUD TO BE A S.L.U.T. ! !
Re: Gutting a cat?
PonyPete #646999 December 30th 2013 12:48 am
Joined: Feb 2012
Posts: 645
R
addict
Offline
addict
R
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?
PonyPete #647104 December 30th 2013 11:28 pm
Joined: Jul 2011
Posts: 969
Likes: 1
old hand
Offline
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?
aftoyboy #647112 December 31st 2013 1:03 am
Joined: Feb 2012
Posts: 645
R
addict
Offline
addict
R
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?
PonyPete #647118 December 31st 2013 3:42 am
Joined: Jul 2011
Posts: 969
Likes: 1
old hand
Offline
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?
PonyPete #647131 December 31st 2013 3:09 pm
Joined: May 2007
Posts: 9,854
Likes: 8
U
Festerus Vannimus
Offline
Festerus Vannimus
U
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 II”


Founder & President of Sooner or Later United Truckers and PROUD TO BE A S.L.U.T. ! !
Re: Gutting a cat?
aftoyboy #647134 December 31st 2013 4:31 pm
Joined: Feb 2012
Posts: 645
R
addict
Offline
addict
R
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?
Uncle_Fester #647135 December 31st 2013 4:35 pm
Joined: Feb 2012
Posts: 645
R
addict
Offline
addict
R
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?

Page 2 of 3 1 2 3

Moderated by  Astro, Uncle_Fester 

Link Copied to Clipboard
Donate


Upcoming Events
discovery
Who's Online Now
0 members (), 16 guests, and 5 robots.
Key: Admin, Global Mod, Mod
Newest Members
TheDrunkenGunsmith, Jac, LOVclassics, ZenMuffin, Milkman530
12724 Registered Users
Top Posters (30 Days)
SDMickey 129
CatFish 25
frscke1 25
Wedgy 21
Forum Statistics
Forums68
Topics35,746
Posts537,915
Members12,724
Most Online177
May 8th, 2013

Powered by UBB.threads™ PHP Forum Software 7.7.4