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Old 07-26-2010
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Exhaust question??

So I was looking around at different exhaust sounds on google and YouTube and I came acrosse a guy who bored out his cats slapped a supper 44 singal in dual out flowmaster exhaust on and ran 3 inch pipes out the back. This was by far the basest sounding ranger I have ever heard that still has the 4.0 v6. The thing is I read somewhere that it's not good to go to big on your exhaust Pipes because you can lose power.

So here's the question ..

If I did the set up but only ran the 3 inch pipes from the muffler to the back of the truck would I be losing power ?

Any suggestions on other types of exhuasts? I'm looking for that nice sound the flowmasters have but from my understanding that's all they got ... A nice sound

and if someone knows where to find that video let me know
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Old 07-26-2010
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Research my posts. Slow flowing exhaust causes loss of scavenging and loss of torque.
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Old 07-27-2010
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3inch is WAY too big. No no. And me i kind of went a cheap way, bought a muffler by the brand of insynerator or something from a local shop and it sounds beast for a 3.0, and it saved me 100 bucks compared to a flowmaster super 44. Came out real good, yet to record and upload though. Might do it tomorrow
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Old 07-27-2010
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Let ne know if you do
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Old 07-27-2010
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So your telling me that if u were to run the muffle to the stock exhaust pipe under the cab then ran a 2 and a half inch out which turned into a 3 inch at the tips that would be bad ? Isn't the pressure coming from the cats and the muffler??
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Old 07-27-2010
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Quote:
Originally Posted by MikeDevo View Post
So your telling me that if u were to run the muffle to the stock exhaust pipe under the cab then ran a 2 and a half inch out which turned into a 3 inch at the tips that would be bad ? Isn't the pressure coming from the cats and the muffler??
for the 12039481203948190238 time

IT HAS NOTHING TO DO WITH BACK PRESSURE.

The exhaust needs to keep moving fast. Smaller pipe = faster flow, high heat and increased scaveging.

Backpressure is bad in all cases - period.
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Old 07-28-2010
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I just put on a new muffler last week. I cut the stock exhaust off right behind the last O2 sensor, where the pipe is still big, went 3" stainless to a 3" in and out magnaflow muffler, then 3" stainless over the axle and out the back. Sounds good, runs good and no loss of power at all. I had my friend who is a welder specializing in stainless to do it and total came to $670 inclding the muffler. As far a boring out your cats, it will not run as good after since the stuff in them is there for a purpose, it cleans the exhaust, and when you remove that stuff in the cats, the exhaust changes and the last o2 sensor knows that, and tells the PCM to compensate for it
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Old 07-28-2010
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2.5 pipe is fine for our trucks. 3 inch isn't needed, but the larger the pipe, the louder is will sound. And before someone jumps on me for tha one. It's simple, the sound bounces off the larger pipes. Loud=Flowmaster & Performance=Magnaflow.
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Old 07-28-2010
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Of course 3" isnt needed, My grain truck with a 14 liter Cummins only has 4``, but this way it is 3`` the whole way, exept for the Y pipe which services only 1 bank or half the engine each.
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Old 07-28-2010
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Quote:
Sounds good, runs good and no loss of power at all.
How did you measure this?

Quote:
As far a boring out your cats, it will not run as good after since the stuff in them is there for a purpose, it cleans the exhaust,
They help burn unused fuel, and only around stoich mixtures.

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..when you remove that stuff in the cats, the exhaust changes and the last o2 sensor knows that, and tells the PCM to compensate for it
Wrong on 2 counts.

The exhaust does not change, mixtures from the primary and secondary hego are equal.

The secondary sensor does not compensate for anything. This post is totally and completely wrong. Secondary hegos are for catalyst efficiency only, not fuel trimming.
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Old 07-28-2010
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How did I measure it you ask. Well since I`ve been driving this truck for 2 years I would think I would know a thing or two about how it runs and drives wouldn`t I? Also since I`ve been pulling wrenches since I was 14 I would know when an engine runs good and when it doesn`t, especially when I drive it every day. Nothing changed, it lugs just like it did before, it pulls the same amount of vaccume when accelerating at the same rate as before, same amount of vaccume when crusing on the highway. And what if it did change by 2 or 3 horsepower. You will never tell unless you are on a dyno. Yes, it cleans the exhaust, by burning unused fuel, Amazing isn`t it? By burning the unused fuel and other noxious gases, they exhaust is therefore cleaner. And yes, when you bore out the cats, it does not burn off unused fuel and noxious gases, so it changes from what it would be if the cats had burnt it away. The sencondary tells the PCM that the cats are not performing like they should so the PCM compensates. Of course the o2 sensor doesn`t change anything, it tells the PCM what is going on so it can change the way the engine runs.
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Old 07-28-2010
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Originally Posted by Dave7060 View Post
The sencondary tells the PCM that the cats are not performing like they should so the PCM compensates.
100% wrong.

secondary hegos have nothing to do with fuel trims.
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  #13  
Old 07-28-2010
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well than what do they do mr genious, please teach all us uninformed brainless steering wheel holders
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Old 07-28-2010
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Originally Posted by Dave7060 View Post
well than what do they do mr genious, please teach all us uninformed brainless steering wheel holders
Secondary hegos serve one purpose, and one purpose alone = monitoring catalyst efficiency.
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  #15  
Old 08-06-2010
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Well here's that video of the exhaust I want it sounds real good

YouTube - Broadcast Yourself.
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  #16  
Old 08-06-2010
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Then I found this and I rather have this

YouTube - Broadcast Yourself.
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Old 08-06-2010
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i cant get that link to work
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