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5.9L Rotary Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps Related To Performance And Longevity

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So i just put 75 hp DDP injectors in my 89. And now if i let off the throttle it hits idle and starts to lope... I asked my bud in town what it was doing and he said that when the fuel entering the ... JOIN NOW TO REMOVE TRACER

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Old 09-14-2011, 01:21 PM
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Elliot Robles Dirtydodge91
   
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Default First gen lope?

So i just put 75 hp DDP injectors in my 89. And now if i let off the throttle it hits idle and starts to lope... I asked my bud in town what it was doing and he said that when the fuel entering the cylinder exceeds 16psi it starts to lope. Is this true and is it a bad thing or a bad a** thing? There are no leaks in or on the injectors or the injector lines so its not air in the fuel. I will try and get a video of it this afternoon.

1989w250's Sig:91 cummins 6 inch lift on 35s, 4 inch turbo back to 6 inch stack, Denny t stage 2 and ddp rebuilt the ve pump and dyno tuned er
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Old 09-14-2011, 02:05 PM
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Everardo Aguilar
   
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It sounds like he knows what he's talkin about but I can't say for sure cuz I'm not really familiar with the first gens. With new injectors and stock lift pump you could be pushing it to the limit with bigger injectors so it's probably having a tough time keepin them fueled. I'm guessin so don't take my word for it.

aguilar_15's Sig:2001 Dodge 2500, ext cab, 6spd. long bed, silencer ring-MIA, 4" turbo back-5" MBRP tip, NAPA BHAF. AD 150, BD exhaust manifold, RV275's Scheid Diesel Lightning VP44-to be installed

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Old 09-14-2011, 02:34 PM
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Elliot Robles Dirtydodge91
   
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So if i got a bigger lift pump it would help me to get the full power of the injectors?
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Old 09-14-2011, 06:36 PM
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Everardo Aguilar
   
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Not necessarily "bigger", but a better lift pump. Such as an AirDog or FASS system that can move fuel from your tank to your injection pump more effectively. Now, I don't know if FASS makes a compatible system for the first gens but I do know that an ADII can be used for them. I believe using onr for a 2nd gen 12valve will work just some grinding/modifying is needed so it can fit the VE. I know there are some lift pumps that you can mount to the engine and run off the belt but I'm not educated enough on them to tell you much more.

As for getting full power, I'm pretty sure you're injectors are doing their job perfectly. Just know that if you're constantly hot-rodding around your lift pump will fail and in time so will your injection pump. I would higly recomend getting a fuel pressure gauge to see what you're running at idle and WOT to be safe, then take it from there. Good luck man

O do post the vid, I'm a huge fan of the first gens
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Old 09-14-2011, 07:21 PM
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whats your idle at? did your tamper with injection pump at all?

BIGREDGOAT's Sig:1992 Dodge Ram 350 dually 5" exhaust with dual 5" turn outs and bhaf with a Bully Dog Fuel Pin, SDX 5x14's with a 3/16" timing bump and fully tweaked ve pump with a holley black pushin the fuel and isspro fuel pressure, 4k tach, boost and pyrometer and a HE351CW
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Old 09-14-2011, 07:37 PM
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Elliot Robles Dirtydodge91
   
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I got a Denny T stage 2 pin and turned the star wheel 2 turns but no smoke screw and no idle

Ill try and do a vid in a bit
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Old 12-02-2011, 11:43 AM
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my truck has been doing the same thing but mine i was told by the local diesel shop is caused because with new injectors you usually have to adjust the idle a bit. and he also told me to bump the timing 1/8 of an inch and that will help too

t-bone117yamaha's Sig:91 cummins 5.9l,190,000, 5 inch stacks,370 sticks, h1c 16cm housing, bd fuel pin, guages:pyro, tranny temp, and air pressure, remote start, minor pump mods, train horn, on board air, cb with 100 watt linear, dual firesticks, renegade 1000 watt amp pushing two monster 12" alpine type "s" subs, infinity 6x9's in the doors and sony 3x8 behind your head, and four 4" sony explodes in the head liner,
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Old 12-02-2011, 12:16 PM
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We at FASS have systems for the First Gen's up to 150 GPH.
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Old 12-02-2011, 02:12 PM
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Gov spring, put a 3200 rpm in it and it'll probably stop. Mine would hit idle hard, can't recall it loping but it was all after I turned the pump up.


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tower_ofpower's Sig:89' W250, full fuel 1 1/2 turns, M&H M3 fuel pin and timing spacer, 366 spring, air dog 150, 6" lift, shocks and dual stabilizer, custom track bar. Soon to be and ordered:transmission "shift reprogram" kit, Mag Hytec double deep trans pan, PDR super S300, HX 40 DP, ATS 3 piece exhaust manifold, DDP stg1 injectors, Fluidamper, oil filter relocation kit, autometer tach, boost, pyro, trans temp gauges.
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Old 12-02-2011, 05:26 PM
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Originally Posted by 1989w250 View Post
I asked my bud in town what it was doing and he said that when the fuel entering the cylinder exceeds 16psi it starts to lope.
Cow pies.

BC847's Sig:David

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