Potentiometer mod

[John Deere Matt]

what is this mod? were is it suposed to go and what exactly does it do?

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2006 2500 Cummins quad cab long box afe stage 2 intake, quadzilla boost fooler, and smarty.looking for more
also have a 1992 w250 turned up and a tighter exaust housing on the turbo

[921stgen]

Here is some reading material for you from the sticky on the dieseltruckresource.com. The pot allows you to dial in your O/D shift points to your liking. There is 2 more threads in the sticky talking about O/D by putting a 3.0 liter V6 TPS on and using governor pressure.

Installing a Potentiometer in place of the TPS - Dodge Diesel - Diesel Truck Resource Forums and Super Cool and CHEAP TPS fix! Dial-in your OD shift point! - Dodge Diesel - Diesel Truck Resource Forums

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91.5 W250 rusty p.o.s., pods, no afc, pull cable, AM electric FP gauge, Isspro boost, pyro, 366, 91 W350 parts truck, (SOLD) 92 W250,
OHIO Coal Rollers

[matj1990]

my tranny shifts from 1st to second fine 3rd kicks in around 30 realy light foot around 20 and then od kicks in bout 1 second after 3rd no matter what speed you guys think this mod will fix that? i have a 0to60 time of 12 seconds pretty much skippin 3rd hoping to see a big diff with this mod

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92 d250,5" turn out stack,smoke screw 4 turns,full power screw 3/4 turn,bhaf,boost gauge.....other stack coming soon

[matj1990]

well i did the mod and its not affecting anything ive turned the pot both ways and it didnt seem to make a difference

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92 d250,5" turn out stack,smoke screw 4 turns,full power screw 3/4 turn,bhaf,boost gauge.....other stack coming soon

[matj1990]

Originally Posted by matj1990

well i did the mod and its not affecting anything ive turned the pot both ways and it didnt seem to make a difference

but it has to be making a connection because if it wasnt wouldnt it not run or work at all

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92 d250,5" turn out stack,smoke screw 4 turns,full power screw 3/4 turn,bhaf,boost gauge.....other stack coming soon

[matj1990]

anybody??????

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92 d250,5" turn out stack,smoke screw 4 turns,full power screw 3/4 turn,bhaf,boost gauge.....other stack coming soon

[unixcowboy]

How far did you turn the pot ???

I adjusted mine with it hanging under the dash at first so I'd have easy access. When I found out I was close, I drilled a hole in the dash and mounted it with the working setting at 12 o'clock. Then I fine tuned it. Now 11:30 it shifts at 35, 10:45-10:55 it shifts at 45, 10:00 it shifts at 55, 9:00 it doesn't shift - at least not up to 70.

I found that a little makes almost no change - if you watch close maybe 1 - 2 mph...
Then you turn it and turn it and turn it - a little each time and all of a sudden it makes a big difference...
From working good to not working is like from 10 o'clock to 2 o'clock...but from 2 o'clock to 12 o'clock is very little change.

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'93 D250 CC auto, 18.5cm w/30 psi, 366 spring w/1 turn clipped, power screw bottomed-backed off 1 turn, modified Ol Smokey's power pin, smoke screw fully out, hat modified to get pin higher - still smokes, '94 trans w/clutches and some hard parts, 4510 w/4 1/2" intake and heat shield, grid htrs mia, 4" dp into 5" pipe to single 5" stack, 285's rear 265's front

[matj1990]

well i can have it all the way one way and it makes no difference when i turn it all the way the other way?

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92 d250,5" turn out stack,smoke screw 4 turns,full power screw 3/4 turn,bhaf,boost gauge.....other stack coming soon

[unixcowboy]

You're driving the PCM nuts giving it the extremes.
Try finding the center - roughly.
See how it drives.
Move it SLIGHTLY one direction then drive it again.
You should notice something by the time you move it 1/8 turn, if not try the other way - SLOWLY....

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'93 D250 CC auto, 18.5cm w/30 psi, 366 spring w/1 turn clipped, power screw bottomed-backed off 1 turn, modified Ol Smokey's power pin, smoke screw fully out, hat modified to get pin higher - still smokes, '94 trans w/clutches and some hard parts, 4510 w/4 1/2" intake and heat shield, grid htrs mia, 4" dp into 5" pipe to single 5" stack, 285's rear 265's front

[matj1990]

Originally Posted by unixcowboy

You're driving the PCM nuts giving it the extremes.
Try finding the center - roughly.
See how it drives.
Move it SLIGHTLY one direction then drive it again.
You should notice something by the time you move it 1/8 turn, if not try the other way - SLOWLY....

ok will try that i feel like a dumm workin right now so wont be able to try it for a while

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92 d250,5" turn out stack,smoke screw 4 turns,full power screw 3/4 turn,bhaf,boost gauge.....other stack coming soon

[matj1990]

when i try it do i stop completly leave it running adjust it try it again ? or do i shut it off start it and do it that way ???

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92 d250,5" turn out stack,smoke screw 4 turns,full power screw 3/4 turn,bhaf,boost gauge.....other stack coming soon

[Begle1]

If it's giving you that many problems, you can always put it on a toggle switch.

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1990 D-250 Regular Cab: Full power screw; stout TC and A518 w/ manual valve body; ratchet shifter; piston LP; Ramcharger tank; manual off; computer-programmable 40 GPH water/meth fumigation; gauges