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

Tuning!

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Old Oct 25, 2009 | 05:29 PM
  #1  
covey88's Avatar
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From: Rittman oh
Default Tuning!

ok since i live in ohio and the weather is getting worse the tuning of my truck needs fixed!!!! my truck has a very bad lag and i need to fix it before the snow falls! i was driving this weekend and went to get on the highway on raining roads and punched it to get in front of traffic and the trucked lag for a second then hit hard and almost put the truck sideways! kinda freaked the girl i was out with out a bit and made me remember that i need to fix it before the snow falls!! my sig has all my mods!!!
 
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Old Oct 25, 2009 | 06:53 PM
  #2  
rkadcock's Avatar
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From: Corrales New Mexico
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I'd start by adjusting the star wheel on top of the afc. It sounds like you need to tighten the spring inside to lower the amount of pre boost fueling you have. If I'm reading your post right, when you floor it, it just sits their and smokes and once the turbo lights it hauls...

I tuned mine last weekend, jus did the star wheel, didn't touch arm or slide the housing anywhere. and now its very very little smoke and the truck has no lag what so ever.

Some others with more knowledge will chime in soon but the starwheel is where I would start
 
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Old Oct 25, 2009 | 07:32 PM
  #3  
covey88's Avatar
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From: Rittman oh
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ya for the most part that is right, it still moves it is just like i am flooding the turbo and once it can light it will haul!!!!

ok how tight? it is like half way now? i did go full forward on afc and 100 plate just so you know.
 
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Old Oct 25, 2009 | 09:47 PM
  #4  
rkadcock's Avatar
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From: Corrales New Mexico
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I would start by tightening the star wheel, right now I have mine fairly tight with a 0 plate full forward and it gets it and minimal smoke... If you still cant get a good tune that you like I'd back the afc off and maybe slide your plate back a little.
 
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Old Oct 26, 2009 | 12:21 PM
  #5  
12.valve.hauler's Avatar
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From: frankfort, KY
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im running no plate and mine is back a lil past stock and it runs great. no lag and the power comes on kinda smooth.
 
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Old Oct 26, 2009 | 03:42 PM
  #6  
covey88's Avatar
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From: Rittman oh
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thanks guys! i will go out and try this after i get over this stupid flu!!
 
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