5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

Anything as far as aftermarket air horns?

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Old Mar 10, 2010 | 11:15 AM
  #11  
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Hmmm.. 50* and -4psi? Screw that . Thanks for the input man
 
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Old Mar 10, 2010 | 11:30 AM
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Originally Posted by 85_305
Hmmm.. 50* and -4psi? Screw that . Thanks for the input man
no prob, that was with my stock wh1c turbo boost went from 36 to 32 with no leaks. not saying the boost drop was a bad thing tho
 
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Old Mar 10, 2010 | 12:55 PM
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that boost drop would be good then..... i didnt lose boost with mine and i noticed a 50-75 drop.... i have the twin ram too....
 
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Old Mar 10, 2010 | 01:03 PM
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Originally Posted by Hightech_Redneck
that boost drop would be good then..... i didnt lose boost with mine and i noticed a 50-75 drop.... i have the twin ram too....
It was and is a good thing, I do like my twin ram but that would be on of the last upgrades to do IMO
 
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Old Mar 10, 2010 | 01:38 PM
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Would you guys care to elaborate why the boost drop was a good thing?
 
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Old Mar 10, 2010 | 02:28 PM
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boost is a restriction, and the more air you can flow the more hp you can make. Just like adding an aftermarket cam or a ported head the air flow has increased causing the boost to fall. also the wh1c is off the compressor map at 36 psi but is back on at 32psi.
 
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Old Mar 10, 2010 | 02:33 PM
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Oh I see. Damn you guys are smart around here. I need to get some diesel bombers paraphenalia hehe
 
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Old Mar 10, 2010 | 02:50 PM
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Boost is resistance to flow. The engine will cycle the same volume of air/fuel through the cylinders and out the turbine at any given rpm, all other things being equal (cam, valves, timing, etc.) Higher boost levels will contain more O2, per cycle of the piston, hence more power.

Intake mods like bigger horns, intercoolers and associated tubing present the same compressor (turbo) with a larger volume to fill/pressurize. So when the system gets going, the engine moves the same amount of air, but at a lower pressure because now the turbo has to work harder to build pressure (boost), so less power.

So more can equal more and less at the same time!
 
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Old Mar 10, 2010 | 02:55 PM
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Holy Alice-In-Wonderland analogy batman! . So what u are saying is, by increasing flow, boost decreases due to flowing more air more efficiently. So what if after u upgrade the system and flow more air, you turn up boost with an elbow or whatever else? Then u have more flow AND more boost. Win-win?
 
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Old Mar 10, 2010 | 03:03 PM
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Basically, yes - as long as it's cool boost. That's what Dave was talking about with the MAP numbers.

But there's a catch-22. The best way to "turn up the boost" as you put it is to add fuel. And without cool boost that means high EGT.

You really have to think about the thing as whole system if you want go any further than token mods.
 
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