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Old 04-10-2007, 10:05 PM   #1
raven
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what is wrong here??

i installed my marine 370s now at low rpms my truck shakes.....im thinkin maybe maybe my star wheel needs adjusted ?????? shoot some stuff at me it is only when its around 1200rpm thanks
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Old 04-11-2007, 01:28 AM   #2
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Is it missing or stumbling? Is it when revving the truck or driving you notice it?
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Old 04-11-2007, 01:43 AM   #3
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is ur lift pump to weak for them big injectors
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quote: BARRY1ME: BTW I love your sig about engineers....but it should be changed to, if the engineers believe it isnt broke it doesnt have enough content removed from it. And thats the truth! (FYI I am engineer and work for Ford lol) At Ford the goal is to make the part barely good enough to passing DV (developmental validation) testing....If it passes way beyond the test then the part was overengineered, and content needs to be removed to reduce cost.

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Old 04-11-2007, 11:45 PM   #4
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It is only when i first start to accelerate around 1000-1200 rpms and when it shifts down into overdrive which is about those rpms i can drive out of it if i just press the accelerator down along with some thick black smole fro the tail pipe
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1999 2500 24v cummins..... built vp44 with fass fuel system with oversized lines, quadzilla adrenaline, built auto and convertor, 5 inch to 6 inch stacks, intake.

1994 dodge 12v cummins...(my project truck) Built auto with shift kit, afe intake, marine 370s,#0 plate, afc forward.
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Old 04-11-2007, 11:48 PM   #5
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You sure it isn't your tranny? Where did you get the injectors? Were they new or used?
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Old 04-11-2007, 11:55 PM   #6
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they were new i bought them from city diesel.net but i think that it must be that i have to much fuel goin into the system when i as more boost from my adjustable elbow it seems to go away a little

it still does it in park when im revving it......it still has a ton of power though
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1999 2500 24v cummins..... built vp44 with fass fuel system with oversized lines, quadzilla adrenaline, built auto and convertor, 5 inch to 6 inch stacks, intake.

1994 dodge 12v cummins...(my project truck) Built auto with shift kit, afe intake, marine 370s,#0 plate, afc forward.
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Old 04-12-2007, 03:43 AM   #7
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sounds like you need bigger delivery valves to compensate for those 370's.
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Old 04-12-2007, 03:59 AM   #8
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Quote:
Originally Posted by raven
It is only when i first start to accelerate around 1000-1200 rpms and when it shifts down into overdrive which is about those rpms i can drive out of it if i just press the accelerator down along with some thick black smole fro the tail pipe
ur seeing the black smoke because the TC is locked.. take it out of OD and arround 30.. when the TC is locked in 3rd gear watch it dump out..

thats ur TC shuttering.. and by turning up ur AFC star its only going to make it worse.. i posted that SAME problem heres what i figured out..

** my truck goes into OD at 40 .. (1100 rpms) if i take it out of OD and hit 45-50 and put it in OD it stops!** try that..

i also thought i was stumbling.. but then again NOT all turcks stumble after installing 370's.. it only made the problem worse ..(adding DV's) hate to tell you its the TC.. i can only imigine how bad yours is.. i have a VB and a SK in mine and its pretty bad.. try to keep the boost under 20 psi.. when acclerating.. normaly im pushing just normal driving 5-7 pounds..
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Old 04-12-2007, 04:04 AM   #9
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Quote:
Originally Posted by raven
they were new i bought them from city diesel.net but i think that it must be that i have to much fuel goin into the system when i as more boost from my adjustable elbow it seems to go away a little

it still does it in park when im revving it......it still has a ton of power though

mine doesnt do it in park.. HM.. what years ur truck.. because i know the 94-95 pumps are a little weaker then the 96-98 pumps, thats why theres alot of stumbling in the 94-95 pumps i think its because the DV's cant keep up with the fuel gonig to the injectors..
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Old 04-12-2007, 03:37 PM   #10
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everybody i know that has those 370's including myself has the same problem, even though mine is five speed.....but yeah theyll shake the **** out of ya, i beleive im gona go with stillcrazyinlaw and say that bigger DV's will be needed....because at low rpms those big injectors dont wana tame down and continue to punch out fuel
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