Fuel Plate Profiles - NC - Page 3 - Dodge Cummins Diesel Forum
94-98 Performance Tech articles dealing with gaining power from the 2nd gen 12V engine

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post #25 of 40 (permalink) Old 01-01-2007, 11:19 AM
 
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put simply, the AFC (aneroid fuel control) is there to handle fueling levels under no boost conditions. The pump has no sensory circuits to know emmisions and/or engine operating parameters. All it kows, is how to set the fuel rack for a given throttle demand, and to limit the top-end rpm of the engine. That's it. So the Aneroid takes this a step farther by sensing manifold pressure to cut back on fuel until MAP is present, at which time it pulls off and allows normal pump operation.

The governor arm contacts the "torque plate" only in high engine load, high demand situations. Most of the time the arm will not swing out and ride the plate....it is only there to limit rack travel in high power request conditions. Again, the pump is stupid, it will supply X amount of fuel for X amount of throttle angle. Without the torque plate there to tailor that fuel delivery, less than optimum fuel delivery is a result. Just like adjusting the ECM fueling maps in a gas engine, except this pump does it mechanically, with a profile and a follower, and the only adjustment you have is to curve your own plate, other than the cursory forward/backward movement. Now you know whay they call it a stupid pump. Doesn't even dynamicly time the engine either, which leaves a lot of decisions whether to static time it for power or streetability...cuz it's constant throughout the rpm range.

Chris

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post #26 of 40 (permalink) Old 01-02-2007, 02:11 PM
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well thanks for that run down chris... i kinda picked up on the AFC being the off-boost fuel control... i think ive got a good idea how the AFC housing and governor operates and limits total fuel availability when out of boost and part throttle.

i guess, now, i just need to decide which plate would best suit my ultimate mod level. all i want is a 600-700 lb/ft setup.
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post #27 of 40 (permalink) Old 01-02-2007, 07:01 PM
 
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all i want is a 600-700 lb/ft setup.
Boy have I heard that before!! You don't need to buy any parts to do that number!! Be careful...it's a very sticky road once you add that first horsepower.

Seriously...have fun, you'll never be the same. I've been building rods for 20 years and have never been seduced in the way this Cummins mill does it. Anyone else have this problem!!?!?!?

Chris
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post #28 of 40 (permalink) Old 01-02-2007, 09:31 PM Thread Starter
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Anyone else have this problem!!?!?!?

Chris
Oh, OF COURSE NOT Chris!!!!!

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post #29 of 40 (permalink) Old 01-04-2007, 02:33 PM
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lol... beleive me, i know about the slippery slope.

i dont know if you guys are familiar w/ Toyota supras... but it starts w/ an exhaust and a boost controller. it evolves into HUGE turbos, 96lb/hr injectors, multiple fuel pumps, stand-alone engine managment systems and so on. you start out w/ 300rwhp. before you know it, youre putting down 800rwhp!

i just dont want to take my motor up to a level where i could damage it by lifting the head or melting a piston or burning up the rings.

if my 10year old truck can hang with the NEW 5.9's, ill be satisfied for a while. i think thats a pretty good accomplishment to stand by for a little time...
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post #30 of 40 (permalink) Old 01-04-2007, 09:13 PM
 
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yeah but with nothin but bolt-ons and some head studs for good measure, 450-500 is pretty easy to get!! Just keep the EGT's in check and screw the head down a little better then she'll live pretty stress free without worry of giving birth to parts LOL
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post #31 of 40 (permalink) Old 01-04-2007, 10:57 PM
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I have heard, allthough it may not be true, that you can take a piece of flat iron say 3/8" or 1/2" and make your own fuel plate... Anybody know if thats true?
it can be done. But its good work!! a shop made a dozen for me a time ago! They looked almost like piers' and tst's etc
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post #32 of 40 (permalink) Old 01-05-2007, 08:32 AM
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I have a 97 25000 4x4 Dodge, At trans, if I move the stock torque plate all the way forward, will it put too much stress on my trans, or will it just add smoke with very little stress on drive train? I dont pull anything heavy, just my commercial mowers. Thanks
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post #33 of 40 (permalink) Old 01-05-2007, 09:10 AM
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the afc is not just for off boost, it is for no boost till you get to full boost, the plate is the full load rack stop. your afc is a great tuning tool. normal driving you will never even touch your plate, you will be on the afc arm.

97 dually 500 plus, 98 quad 12v wifes, and the toy a 98 reg cab short bed with a hx40 and ht3be
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post #34 of 40 (permalink) Old 01-05-2007, 01:59 PM
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id like to gut the AFC housing cuz im willing to bet that the arm is probably set a little on the conservative side and sacrificing power as a compromise to find a suitable solution for the masses. i wouldnt mind manually controlling my boost-comp fuel delivery and having smoke on demand... i dont think ive ever just floored it. i usually eek it out of the hole and roll on the throttle after im over 30-40mph. i wouldnt be surprised if i saw no difference w/ the arm removed and the same driving style.
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post #35 of 40 (permalink) Old 03-12-2007, 12:47 PM
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normal driving you will never even touch your plate, you will be on the afc arm.
what do you mean by normal driving? anything short of pulling a trailer or load?

1998 2500 cc/sb 12v auto(daily)
1990 D250 rc/lb NV4500 (under construction toy)
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post #36 of 40 (permalink) Old 03-12-2007, 07:17 PM
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keeping boost under about 6-10psi. at those boost levels the afc is keeping you off the plate. as boost goes up it pushes on the diaphram in the afc housing. the diaphram pushes the afc foot out of the way than you are on the fuel plate. the link below shows how the afc works.


CumminsDatabase.com :: P Pump Cutaway

Modified 97 3500
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