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post #1 of 10 Old 07-02-2009, 03:49 PM Thread Starter
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learning something new

an Old time diesel grease monkey and I were sharing thoughts and he told me that diesel do need some "slight" back pressure.

Ever since I heard that they do need some pressure a while ago on this forum iv been searching like crazy on this forum to read up on more.

He said that only down pipe is too Little and with the cat its too much(perf wise). 3.5 dp to 4 is good and 4 tb is good.

it was all about 6.0 and diesel in general. and he loves AMSOIL


Im not trying to get a huge confliction here but just throwing out my info. but please go ahead and comment
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post #2 of 10 Old 07-02-2009, 03:52 PM
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i've heard that like a 5 inch straight pipe on a stock truck hurts performance a little bit, (read that in DP mag, so who knows....) but i would think a turbo charger would be enough BP on a diesel..............

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post #3 of 10 Old 07-02-2009, 03:56 PM Thread Starter
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i've heard that like a 5 inch straight pipe on a stock truck hurts performance a little bit, (read that in DP mag, so who knows....) but i would think a turbo charger would be enough BP on a diesel..............
o yes I meant with a turbo. with out of course the eng would need bp

Thanks for the comment
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post #4 of 10 Old 07-02-2009, 03:56 PM
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I dont know one way or another but I would like too!

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post #5 of 10 Old 07-02-2009, 04:02 PM
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o yes I meant with a turbo. with out of course the eng would need bp

Thanks for the comment
i kinda messed up my post, i guess i could sum it up by saying that if a big turbocharged diesel needed backpressure, then the guys who run high HP sled pullers wouldn't run stacks out of their hood directly off the turbo.......at least that's how my thought process works anyway.

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post #6 of 10 Old 07-02-2009, 04:05 PM
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most 6.0's use the EBP sensor in running the engine, not just to monitor for faults. The PCM attempts to achieve a certain BP level under load. So a larger exhaust on an otherwise stock truck would be a mild improvement in power. it may also cause fault codes when the expected BP level can't be attained.
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post #7 of 10 Old 07-02-2009, 07:37 PM Thread Starter
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i kinda messed up my post, i guess i could sum it up by saying that if a big turbocharged diesel needed backpressure, then the guys who run high HP sled pullers wouldn't run stacks out of their hood directly off the turbo.......at least that's how my thought process works anyway.
its the Day by day driving that bp is needed. gunning the living snot out of it is when it doesn't need any bp.
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post #8 of 10 Old 07-03-2009, 01:32 PM
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DP really isn't that bad most important is losing the kitty.
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post #9 of 10 Old 07-03-2009, 01:39 PM
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Turbo creates all the backpressure you need

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post #10 of 10 Old 07-03-2009, 02:10 PM
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all i have is pretty much 2 ft of pipe after the dp. seems like it likes it lol. the turbo is very loud too

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