Which of these 2 exhaust setups will give me lower EGT's? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 08-18-2008, 02:05 PM Thread Starter
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Which of these 2 exhaust setups will give me lower EGT's?

I have already done a search on the forum and could not find a clear answer. Some say "the longer the pipe, the lower the EGT's," and some say "the shorter the pipe, the lower the EGT's."

My tuck is mechanically bone stock except for an airaid filter, zoodad, CCV mod, and straight piped-stock exhaust with a 5" tip.

After straight piping the truck I noticed quicker spool-up and the sound was amazing. I am very satisfied with it. But, I just recently received a chrome 5" stack for free. I was thinking about possibly getting rid of the rear half of my exhaust and running the stack "dumped" after the cab. The stack has a 45degree angle on top so that would be my turn-down. Basically, I would be increasing the pipe diameter to 5" after the downpipe and shortening the length of pipe.

Do I have anything to gain from this other than possibly sound? Lower EGT's? MPG difference?
Would it affect the 6.0 exhaust back pressure sensor?

'94 F-350 CC DRW 2WD Turbo IDI 7.3
Rebuilt E4OD w/"updates" & billet Precision "RV" TC
Custom welding Bed/Lincoln Classic II
Helper Bags
3" straight pipe w/one-off 6" SS tip
K&N Air Filter
Pioneer HU/Alpine components
7 235/85-16's (spare tire holder is modded for a bigger than stock spare)
FL-1995 & new ZD9's
Next: whenever the OEM injectors go out they will get replaced with BB codes

Last edited by Texas6.0; 08-18-2008 at 02:13 PM.
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post #2 of 14 Old 08-18-2008, 02:11 PM
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I can't see any gains in lowering EGTs by swapping the pipe. If that was true we all would have short pipes under our trucks. Doesn't seem reasonable for a stock truck.

Now if you had a 700HP sled puller I would believe there would be something to gain.


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post #3 of 14 Old 08-18-2008, 02:15 PM
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I don't see anything being gained, but I have always had a short exhaust on my truck. I even have part of a free 5" stack under there too.

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post #4 of 14 Old 08-18-2008, 02:18 PM
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Where did you get the 3.5 to 5 inch tip from

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post #5 of 14 Old 08-18-2008, 02:21 PM Thread Starter
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Free is always good, LOL. I guess I'll keep my current exhaust setup since I like how my tip looks and the fact that it allows me to blow smoke into other cars' windows. Unless someone says there will be some difference and has some sort of proof or data. Thanks for the quick responses guys.

'94 F-350 CC DRW 2WD Turbo IDI 7.3
Rebuilt E4OD w/"updates" & billet Precision "RV" TC
Custom welding Bed/Lincoln Classic II
Helper Bags
3" straight pipe w/one-off 6" SS tip
K&N Air Filter
Pioneer HU/Alpine components
7 235/85-16's (spare tire holder is modded for a bigger than stock spare)
FL-1995 & new ZD9's
Next: whenever the OEM injectors go out they will get replaced with BB codes
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post #6 of 14 Old 08-18-2008, 02:23 PM Thread Starter
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Quote:
Originally Posted by Dave View Post
Where did you get the 3.5 to 5 inch tip from
It's a 4" to 5" tip and the extra .5" was filled in at the muffler shop.

'94 F-350 CC DRW 2WD Turbo IDI 7.3
Rebuilt E4OD w/"updates" & billet Precision "RV" TC
Custom welding Bed/Lincoln Classic II
Helper Bags
3" straight pipe w/one-off 6" SS tip
K&N Air Filter
Pioneer HU/Alpine components
7 235/85-16's (spare tire holder is modded for a bigger than stock spare)
FL-1995 & new ZD9's
Next: whenever the OEM injectors go out they will get replaced with BB codes
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post #7 of 14 Old 08-18-2008, 02:42 PM
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Quote:
Originally Posted by pipelayerjdh View Post
I don't see anything being gained, but I have always had a short exhaust on my truck. I even have part of a free 5" stack under there too.

I agree other than sound

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post #8 of 14 Old 08-19-2008, 06:28 AM Thread Starter
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So I have nothing to gain except maybe sound, but do I have anything to lose?

Loss of low end power? Negative effects on the exhaust back pressure sensor?

'94 F-350 CC DRW 2WD Turbo IDI 7.3
Rebuilt E4OD w/"updates" & billet Precision "RV" TC
Custom welding Bed/Lincoln Classic II
Helper Bags
3" straight pipe w/one-off 6" SS tip
K&N Air Filter
Pioneer HU/Alpine components
7 235/85-16's (spare tire holder is modded for a bigger than stock spare)
FL-1995 & new ZD9's
Next: whenever the OEM injectors go out they will get replaced with BB codes
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post #9 of 14 Old 08-19-2008, 06:39 AM
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There isnt a back pressure sensor on these trucks that I know of

2010 F-250, Black
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post #10 of 14 Old 08-19-2008, 06:43 AM
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Quote:
Originally Posted by Texas6.0 View Post
So I have nothing to gain except maybe sound, but do I have anything to lose?
Yes, relative quiet in the cab..........I made the mistake fo doing that on one of my trucks and the droan at HWY speeds sucked.........

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