do 6.0's need back pressure? - Ford Powerstroke Diesel Forum

View Poll Results: do 6.0's need back pressure or not?
yes 11 35.48%
no 20 64.52%
Voters: 31. You may not vote on this poll

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post #1 of 27 Old 03-14-2007, 04:11 PM Thread Starter
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do 6.0's need back pressure?

do they or dont they?

2004 Excursion
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post #2 of 27 Old 03-14-2007, 04:15 PM
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You forgot the "Heck, I don't know" button, Stumps

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post #3 of 27 Old 03-14-2007, 04:39 PM
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im running mbrp downpipe only for like 2 months now..its fun


2003 psd 6.0
red crewcab
16" suspension lift, 48" michelin xml's on 20x10 black rockstars, 6000k hid's, crossover steering, zoodad mod, ccv mod, modified up pipe to delete egr cooler,high idle mod, mbrp 3.5 downpipe, train horns(also on remote), diamond plate tool box, recon smoked cablights, Code670 alarm/remote start,100w reverse lights, oil-based underbody paint
**soon to purchase SCT rockwell 2.5 ton frt/rear
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post #4 of 27 Old 03-14-2007, 04:54 PM
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It's my thought that the issue is exhaust velocity/volume...
-pipes too small=increased velocity/decreased volume-engine can't breath(like breathing out through a straw)
-pipes too large=decreased velocity/increased volume-exiting exhaust gasses can't help pull exhaust from the combustion chamber
-pipes just right=greatest volume and velocity ratio-engine likes!

...just my

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post #5 of 27 Old 03-14-2007, 05:52 PM Thread Starter
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Quote:
Originally Posted by navydiver View Post
It's my thought that the issue is exhaust velocity/volume...
-pipes too small=increased velocity/decreased volume-engine can't breath(like breathing out through a straw)
-pipes too large=decreased velocity/increased volume-exiting exhaust gasses can't help pull exhaust from the combustion chamber
-pipes just right=greatest volume and velocity ratio-engine likes!

...just my

what are you considering just right, i think im about to dump my exahaust at the down pipe

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post #6 of 27 Old 03-14-2007, 06:05 PM
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???? Dunno, I would think yes but very very little....

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post #7 of 27 Old 03-14-2007, 06:34 PM
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i would think there is plenty in the turbo...you gotta figure...those exhaust gases are what is creating that 25+ psi of boost so that 25+ psi of boost is pushing back on the turbine wheel a bit. thats just my reckoning though.
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post #8 of 27 Old 03-14-2007, 06:43 PM Thread Starter
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i only hit 21 max

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post #9 of 27 Old 03-14-2007, 06:46 PM
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Dang, I launch at 22 PSI.

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post #10 of 27 Old 03-14-2007, 06:53 PM
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thats they way i see it too turbodude...the exhaust up pipe is what turns the turbine wheel and as long as it has any sort of free flowing exhaust exiting the turbo it shouldnt matter..maybe if the uppipes were to big it would effect the turbo lag but then again ive heard theories on either way so i think we need some1 to dyno a 6.0 with large diam straight pipe and smaller diam pipe ...maybe even with a muffler to see what the gains are...for the sound of the 03 6.0 i dont think it would be worth it to put a muffler on it and lose the whistle IMO

ive hit 27psi with mbrp dp only going up a hill..but normally stay 24ish


2003 psd 6.0
red crewcab
16" suspension lift, 48" michelin xml's on 20x10 black rockstars, 6000k hid's, crossover steering, zoodad mod, ccv mod, modified up pipe to delete egr cooler,high idle mod, mbrp 3.5 downpipe, train horns(also on remote), diamond plate tool box, recon smoked cablights, Code670 alarm/remote start,100w reverse lights, oil-based underbody paint
**soon to purchase SCT rockwell 2.5 ton frt/rear
-8,520lbs with me in it
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