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

boost seems low???

Old Feb 28, 2012 | 01:16 PM
  #1  
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Default boost seems low???

32-36 PSI MAX depending where i have the boost elbow set
i could spin the stocker up to 50lbs if i wanted to
i can burry the EGT's pretty quick if i want
played with a few fuel plates with the same results

i very much feel like i should be able to produce much higher #'s

any thoughts? i still am running the stock LP and have no gauge. the truck is gutless from 70mph on up but quite responsive down low, plenty of smoke if i want it could this be a low fuel pressure situation?

this turbo is much quieter than the wh1c if that matters, it isnt laggy and i have no boost leaks......
 
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Old Feb 28, 2012 | 02:06 PM
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what turbo is it? if its a bigger turbo thats somwhat normal more flow and less psi than stockers
 
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Old Feb 28, 2012 | 02:18 PM
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its the super B in my SIG. so it is still a very small turbo. 57mm wheel vrs the stock 56mm very very close. i dont feel like that is the problem? i dont think the gate is doing anything funny. im holding low boost #'s fine. very perplexing?
 
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Old Feb 29, 2012 | 01:49 PM
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well my super 64 was doing the same thing new injectors, tuned afc and new boost guage and im back in buisness start off small look for leaks, fuel psi cheap obvious stuff first
 
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Old Feb 29, 2012 | 03:16 PM
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im leaning towards fuel pressure? but its odd to me that i can burry the pyro?
 
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Old Feb 29, 2012 | 06:04 PM
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here the weird thing even with low fuel pressure it still creates high heat if the afc isn't registering the boost so if low boost the rack travel is limited causing it to be low fuel and high egts
 
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Old Mar 1, 2012 | 08:11 AM
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regardless if thats the problem or not that is very interesting...
 
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Old Mar 1, 2012 | 11:16 AM
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ya thats what i found out threw my experiece working on my truck
 
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