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Back pressure?

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Old Feb 3, 2010 | 11:17 AM
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1997fordlariat's Avatar
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Back pressure?

I have a 97' with the 5.4 that I cut the exhaust off right before the muffler, just curious if there is enought back pressure for the motor, runs fine except the typical rough idle. I plan on adding more strait pipe with a 45' and exciting out before the pass. side rear tire with a 2.5 to 4 tip. Will it hurt to run it this way for a while?
 
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Old Feb 3, 2010 | 12:57 PM
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Back pressure is a bad thing. Velocity is what you want. Yes, it will be fine.
 
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Old Feb 3, 2010 | 01:43 PM
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You'll be fine.
 
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Old Feb 3, 2010 | 03:37 PM
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Cool

HI!... Read.... learn..........

http://www.cobbtuning.com/info/?ID=3222
 
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Old Feb 3, 2010 | 08:02 PM
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Where does everyone get this "back pressure" idea from?
 
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Old Feb 3, 2010 | 10:51 PM
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Originally Posted by avfrog
Where does everyone get this "back pressure" idea from?
The master scientist exhaust shop employee's with degree's in physics, they graduated from jcwhitney magazine
 
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Old Feb 4, 2010 | 09:00 AM
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Originally Posted by avfrog
Where does everyone get this "back pressure" idea from?
I think wikipedia explained it best. (I'm pretty sure it was wiki)

Someone replaces their exhaust from 2.5 inches to 3 inches (ricer for example), and notices a large performance hit. The person comes to the conclusion that the system is too free flowing and more back pressure is needed for the engine to work properly.

That's what the uneducated come to believe.
 
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Old Feb 4, 2010 | 09:11 AM
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Originally Posted by avfrog
Where does everyone get this "back pressure" idea from?
Hey! We are making progress here

Years ago, before yer time, the folks here were sayin':

Originally Posted by youngin' hillybilly crappachino-sippin' rednecks
Where does everyone get this "exhaust gas velocity" idea from?
Backpressure? I got yer backpressure right here...



MGD
 

Last edited by MGDfan; Feb 4, 2010 at 09:14 AM.
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Old Feb 4, 2010 | 11:25 AM
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Old Feb 4, 2010 | 06:55 PM
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I always get a kick out of that. "Your not going to have enough back pressure"!!

LOL
 
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