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NTC 400 Mo Power
- Thread starter eldgenb
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R Racing
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- St. Leonard, MD
Tide does a motor good LMBO 
eldgenb
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Yeah, mine is also painted black, it all looks the same.... and a little dirt never killed anyone 
Mine engine is also black and filthy...I wasn't insinuating anything...Yeah, mine is also painted black, it all looks the same.... and a little dirt never killed anyone
Shoprat 19th Engr
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The screw that you are adjusting is not for fuel it is the air ratio adjustment if you want to do the fuel you have to put a different size button in the pump
eldgenb
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that's interesting since air does not pass through the pump, and as far as I know it had nothing do do with the amount of air that goes into the cylinders, I always thought that was what the turbo was for.... What is also interesting is that pump mechanic at my local Cummins northwest repair center is the one who provided me with the shims and the step by step for turning up the fuel and shimming the Gov springs. Fuel button sizes down the hole on the return line to slow the flow of returning fuel which increases line pressure for the injectors. I appreciate your .02 but wrong information on an open forum can mess people and their equipment up pretty bad, I am not careless enough to make a thread like this without doing all of my research up front.
Thank you.
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Shoprat 19th Engr
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You are correct forget the style of pump that was on the old NTC super 250 . I did work on the 855 cummins , 1693 3406 3408 cats , 671 v692 v892 v1292 detroits for 17 yrs sorry for the wrong info
- 1,046
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- Syracuse, New York
I'd like to know what button #'s are being used in various engines.
ex-NHC 250 -#27
ex-NHC 250 -#27
eldgenb
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from what I have gathered 14's are the most common in the stock application, you can go down 5 from stock and be pretty safe. The fuel adjustment through the shaft is easily adjustable and free, if you turn it up too much and are getting excessive smoke just use a small screw driver and turn it down, if you change the button you are taking the entire governor assembly apart and carrying a variety of fuel buttons to accommodate your different driving habits.
flametamer
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Nevermind. I wasn't looking hard enough. The air compressor already draws air from the turbo too.
And what is the switch on the linkage for?
Dt
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- Syracuse, New York
What's rated power for "stock"? I have a NHC250 w/turbo and no intercooler. I won't able to make the boost 400 does due to high charge temp. I'm looking for 290-300hp, that's assuming the EGT is ok. I may try a #20.
I turned the throttle shaft screw 1-1/4 turns. Not much change.
eldgenb
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the jake brake
eldgenb
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The thread is relative to the NTC400 not the NHC250 so stock refers to the 400hp cummins. Fuel and boost are directly related, the more fuel you put in the more boost the truck builds until it either maxes out the turbo's flow and most likely the egt's before that. I have no idea what it will do to and NHC250, my guess is send the temps through the roof unless you turbo it like yours and with no intercooler... be careful. I took mine out 4.5 turns, perfect!!
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MidnightDuramax
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Does anyone know if the Jake is suppose to automatically dissengage after slowing to a low enough speed. I know on mine if you hold the pedal it will stall the engine out. just wasn't sure if this is how it is suppose to be or if something had been disconnected.
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This is how it works, the floor foot pedal switch on the mil. trucks is a dash switch on standard shift civi trucks
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R Racing
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Are those full turns Eldgen ? or 4 1/2 1/2 turns ?? Sorry but everyone seems to screw differently. LOL
eldgenb
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full turns
still minimal smoke, excellent increase in power.
MidnightDuramax
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mine has a switch on the dash as well. it is off, medium, or full. the pedal is what activates it. but like i said on a civy truck the jake shuts of automatic when the truck gets to a slow enough speed, but the 915 as long as ur on the pedal it is on and can stall the truck out. So i was wondering if the jake is suppose to turn itself off at low speeds on the 915.
R Racing
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No thats normal for the m915 take your foot off when you dont need or want it. no computer hooked up to it like more modern trucks.
MidnightDuramax
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Ok thats what I was wondering thanx. I knew there is no computer just wasnt sure if it was done another way. Thanks for the info