12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

weak 12 valve

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  #1  
Old 10-15-2010, 02:31 PM
bean farms's Avatar
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Default weak 12 valve

alright boys i have 98 12 valve 4k gsk twin turbos top turbo is 12/62/68 bottom is a ht3b with a 26cm ex. housing. 100 plate full foward tuned afc.timming at 14.5* head studs and i just put in a set of 5x.014 injectors from sdx this truck is still weak and cant figure this one out need help
 

Last edited by bean farms; 10-15-2010 at 04:01 PM.
  #2  
Old 10-15-2010, 03:02 PM
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I've never had a truck quite this built but my guess would be lift pump? is it still stock? and it could just be the way your pump is tuned. thats just my best guess
 
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Old 10-15-2010, 03:36 PM
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I'd check to see if the timing has slipped.
 
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Old 10-15-2010, 03:50 PM
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intercooler leaks possibly or check the fuel pressure would be my first two thoughts
 
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Old 10-15-2010, 04:02 PM
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whats a good way to check for boost leaks
 
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Old 10-15-2010, 04:16 PM
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Look hard at the transmission too. You can have all the power in the world, but if you cant put it to the ground its useless.



Boost leak tester:

https://www.dieselbombers.com/5-9l-2...ak-tester.html

https://www.dieselbombers.com/24-val...ke-system.html

https://www.dieselbombers.com/dodge-...tructions.html
 

Last edited by Dr. Evil; 10-15-2010 at 04:20 PM.
  #7  
Old 10-15-2010, 09:32 PM
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ur exhaust housing is to big im thinkin
 
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Old 10-15-2010, 09:43 PM
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his exhaust housings are fine, there is always the chance your cam is retarded a few degrees which will ruin performance. i have seen this happen to stock trucks built from the factory its the main reason why some trucks just seem to run better than others. good luck figuring it out
 
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Old 10-15-2010, 11:44 PM
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i dont guess there is an eazy way of checking to see if the cam is set up right is there
 
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Old 10-16-2010, 03:30 AM
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no clue but when you find out let me know
 


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