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

boost question

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Old 04-27-2010, 07:47 PM
lodal cummins's Avatar
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just wondering what kinda numbers others are running. when i stab it pretty good i'am only around 15 or 18. i put in a bhaf filter aweek ago and went up a little. i know boost does not exactly mean more power but i think i should be around 20 or 25. i got a boost elbow and can not see a crimped line or see any boot leaks. truck runs great and just puts out a haze of smoke when getting on it. just thought it should be a little higher than that.
 
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Old 04-27-2010, 08:03 PM
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Thats all they run stock. And the boost elbow you have is probably set to 20psi. Buy an adjustable boost elbow and set it to 35psi and call it a day.
 
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Old 04-27-2010, 08:05 PM
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im runnin 35 with mine when i punch it
 
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Old 04-27-2010, 08:45 PM
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so i took the stock elbow off when i got my fuel plate and put the one on that came with the fuel plate. is this not a adjustable elbow? where do you get the adjustable elbow?
 
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Old 04-27-2010, 08:48 PM
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Nope the one that comes with the fuel plate isn't adjustable (ask me how I know..). Go to ebay and type in boost elbow. Look for the one that is adjustable


Here you go. 16$ shipped

Adjustable Boost Elbow ---Dodge Cummins Turbo hx35 hx40 : eBay Motors (item 300394038373 end time May-06-10 11:23:13 PDT)
 
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Old 04-27-2010, 09:07 PM
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my boost gauge stops at 60 so I'll have to say 60+
 
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Old 04-27-2010, 09:10 PM
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thanks man i will pick me up one i would pop a top for sure at 60!!!! 94 12 valve has GOOD head bolts!!!!!!
 
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Old 04-27-2010, 09:12 PM
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Originally Posted by lodal cummins
thanks man i will pick me up one i would pop a top for sure at 60!!!! 94 12 valve has GOOD head bolts!!!!!!
12mm studs and o rings ... also DO NOT run that much boost with a hx35 keep the boost arround 32psi.
 
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Old 04-27-2010, 09:27 PM
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yeah i was really wanting about 25 28ish just to be safe with the stock head set up. does upgrading injectors create much more cylinder pressure? just want to go with 75hp. my 92 5 speed is going to be my real hp project down the road as mods are spendy and money on trees in my yard are not blomming yet!!!!
 
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Old 04-27-2010, 09:29 PM
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stops at 50 stock head and bolts for now no problems so far
 


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