Will a Larger Exhaust lower my EGT's - Ford Powerstroke Diesel Forum
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Old 08-08-2007, 06:22 PM
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Will a Larger Exhaust lower my EGT's

Just trying to get some info on how much a larger exhaust (4 or 5 inch) will do for lowering my EGT's.

Is there a difference in the temperatures on a CAT back system compaired to the turbo back?

Currently running the Edge Evo and I have no problem getting my EGT's above 1250 so I am looking for a way to lower them.

H
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Old 08-08-2007, 06:25 PM
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I would do a turbo back system. You can get one for pretty much the same money as a cat back system. It will def help ya run cooler.
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Old 08-08-2007, 06:44 PM
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i agree with logan... get yourself a 4" TB exhaust no cat or muffler...
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Old 08-08-2007, 07:05 PM
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DITTO THAT!!! A GOOD MANDRELL BENDER WILL HELP STRAIGHTEN OUT THOSE RESTRICTED WRINKLES AND MAKE HER FLOW BETTER. STRAIGHT PIPE IF YA CAN GET AWAY WITH IT!! WISH YA BEST!!!
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Old 08-08-2007, 07:14 PM
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Like the others have said, go 4" Turbo back... you can straight pipe it or at least throw on a high flow muffler...

you aren't running enough horsepower to warrant a 5" exhaust unless you specifically want the look. Plus from what I've read/heard, the 5" may cause you to lose a little bit on the low end.
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Old 08-08-2007, 07:17 PM
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Quote:
Originally Posted by Blue01F250 View Post
you aren't running enough horsepower to warrant a 5" exhaust unless you specifically want the look. Plus from what I've read/heard, the 5" may cause you to lose a little bit on the low end.
Has this ever been "proven" or is it just here-say? Sorta like the thought that a bed cover will not improve mpg. Both were recently tested in a diesel magazine and the results do not support the myth.

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Old 08-08-2007, 07:24 PM
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I always heard a bed cover helps MPG??? I know when I was dumping my factory exhaust at the downpipe - my truck was gutless..until I installed the whole exhaust. But, that is why I said that is what I've read and heard...
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Old 08-08-2007, 07:28 PM
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I vote for a 4 inch turbo back system with a nice crome 5 inch tip. I to have heard that you dont need a 5 inch until you get to around 600 hp, but I dont have anything that can prove that. With a 4 inch system your temps should drop a couple hundred degrees, correct my if im wrong not to sure. I wanted to get a EGT prob and then my exhaust to see how big a difference it made but I just couldnt handle myself and bought the exhaust first, just had to hear that turbo.
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Old 08-08-2007, 07:32 PM
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Quote:
Originally Posted by Blue01F250 View Post
I always heard a bed cover helps MPG??? I know when I was dumping my factory exhaust at the downpipe - my truck was gutless..until I installed the whole exhaust. But, that is why I said that is what I've read and heard...

There might be something to say for exhaust "length" then to improve/keep velocity up. I imagine it's a fine line with too much, not enough length in piping, much like a equal length primaries on headers. I know when i run open headers on my car, it doesn't lose any tq(actually it increases), but it moves the torque band higher, thereby making it "feel" slower in city driving situations....


As for the bed cover, yea i agree. In my infinite waste of time reading of the board this afternoon, i saw where someone posted that having an open bed helped "push" the truck

I think they got that off of mythbusters. But the fact is "mythbusters" was working the myth of the tailgate down vs. up to improve fuel effeciency.


These two have always been interesting issues for me....


Anyways, sorry to jack up a thread!!!
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Old 08-08-2007, 07:43 PM
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Quote:
Originally Posted by Tim99ws6 View Post
Has this ever been "proven" or is it just here-say? Sorta like the thought that a bed cover will not improve mpg. Both were recently tested in a diesel magazine and the results do not support the myth.

Yes this has been proven for years...Its called tuning your exhaust....Try changing the exhaust on something more noticible like a small engine or a motorcycle...See what happens...Same with a big ol turbo diesel....You just dont notice it as much....Unless your making an insane amount of power a five inch turbo back would probably hurt more than help....
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