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Turbo Backpressure

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Old May 26, 2010 | 08:59 PM
  #1  
Canadian_Cowboy's Avatar
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Turbo Backpressure

hey guys
so i browsed through a whole bunch of posts but couldnt really find a straight answer.
i want to know how much backpressure (if any) our turbos need to function "properly"
if i run a straight pipe will that be to much flow? should i go with cat only? or muffler only?
thanks guys!
 
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Old May 26, 2010 | 09:02 PM
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It is only a myth, these diesels do not need any backpressure whatsoever! I am running a full 4" straight pipe and runs like a champ ... sounds great too
 
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Old May 26, 2010 | 09:26 PM
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any more then 4" you start to lose the bottom end power and suffer from lag.
 
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Old May 28, 2010 | 12:25 AM
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the reason i ask is because my best friend and i both have 07 6.0 but his is a four door whereas mine is an ext cab. we run the same programmer on the same settings and no mods expect i have a stock pipe straight pipe. where he has 4 inch with cat still in. when we go out he hauls a 4x4 quad in the box yet still goes about 250-350 kms more ona tank of diesel than i do. any thoughts?
 
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Old May 28, 2010 | 12:36 AM
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Is his a long bed and yours a short bed? If so his tank is bigger. But since you said the same, probably not.

Maybe he drives smoother or doesn't accelerate as hard as you do? Does he do more highway driving than you do?

Mark
 
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Old May 28, 2010 | 12:56 AM
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no we did a side by side test after a few times of him heckling me about my fuel economy. same 100 liters in the tank then a drive. and my shame
 
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Old May 28, 2010 | 01:18 AM
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Strange.

....
 
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Old May 28, 2010 | 06:55 AM
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Originally Posted by Canadian_Cowboy
the reason i ask is because my best friend and i both have 07 6.0 but his is a four door whereas mine is an ext cab. we run the same programmer on the same settings and no mods expect i have a stock pipe straight pipe. where he has 4 inch with cat still in. when we go out he hauls a 4x4 quad in the box yet still goes about 250-350 kms more ona tank of diesel than i do. any thoughts?
First thing, a turbo needs "0" back pressure to operate. On the 6.0 any exhaust back pressure inhibits turbo performance. After I took the cat out and put the MBRP cat delete pipe in the remaining stock exhaust system, the first improvement I noticed was improved low end throttle response, i.e., reduced turbo lag. After I replaced the stock exhaust with a 4" MBRP exhaust, I eliminated all turbo lag.

With the straight pipe, your turbo is reacting quicker then your friends. Under the same load conditions, your initial RPM will be higher then your friends. Higher RPM = more fuel.

I would venture a guess that if you drove his truck, his throttle response would be less then yours.

DSMMH
 
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Old May 28, 2010 | 08:50 AM
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How many km's to a tank does he get? How many km's to a tank do you get? He must be messing with you...
 
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Old May 28, 2010 | 07:16 PM
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nah man hes not messing with me. ive see it in a side by side drive. i get about 650-750kms to a tank and he gets almost 900-1000
 
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