1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Whats Wrong With My Boost

Old Mar 31, 2010 | 10:24 PM
  #1  
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Default Whats Wrong With My Boost

alright guys im not seeing the boost i should be seeing im wonderin whats wrong. i definitely have plenty of fuel flowing i know thats not the issue. i have hx40 8 blade which is a 56mm wheel and 18cm housing. before i put my fuel pin in, it would max at 20 psi, now itll do 26 psi. ive adjust and adjust the boost elbow and i get no more boost out of it. no matter what gear im in, at WOT, i am only seeing 26 psi max. and ive checked for leaks there are none. any ideas what would cause this?
 
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Old Mar 31, 2010 | 10:34 PM
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How is the waste gate set? If its crazy loose no matter what you really do with the elbow it will open. Try clamping the line to teh wastegate head to see if your boost is better.

Also check to make sure you don't have a kink in the line to your gauge.
 
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Old Mar 31, 2010 | 10:45 PM
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ive tried the boost elbow all the way in all the out inbetween etc etc etc. ive checked the boost line its not kinked anywhere.

could my IP just not be set right now causing it to spool up? or will the IP not have anything to do with spooling
 
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Old Apr 1, 2010 | 05:18 AM
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the ip has everything to do with spooling a turbo.Are you seeing excess fuel coming out the back?
 
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Old Apr 1, 2010 | 10:01 AM
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Could be just a leaking waist gate or a cracked housing. Or your just at the limits of how your pump is set-up.
 
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Old Apr 1, 2010 | 09:22 PM
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block the waste gate off and see what it does
 
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Old Apr 1, 2010 | 11:00 PM
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ill try it soon my trucks still at the body shop but ill mess with it when it gets home. and yes it spits smoke out everywhere
 
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Old Apr 3, 2010 | 05:09 AM
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mine was the other way around with the hx 40 low boost (5psi) but no black smoke had to tune to afc better but so much nicer now
 
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Old Apr 3, 2010 | 11:53 AM
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ive messed with the afc a ton. its been moved way up and so has the smoke screw. it helped it spool a little better but it still maxes out at 26 psi
 
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Old Apr 3, 2010 | 02:15 PM
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Originally Posted by seandonato73
block the waste gate off and see what it does
Have you tried this yet?
 
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