My FIPL mod for the E40d

So apparently my tps or fipl was out of range measuring at .8v at idle. I thought I was just too dam light on my peddle. I have been getting wierd shifts and replaced all the corresponding components. Vss, tach sensor on the IP gear cover. cleaned out all the connections and added silicone grease. when I changed my fipl, it measured at .8v at idle.
This is a van chassis mind you. not a lot of space for my milkshakes. if I have to adjust the fipl manually, Id have to take off the fuel filter and squeeze a flex wrench in there with that torx screw.
I had a bright idea of just bypassing the fipl and adding my own potentiometer. I did some poking around and nobody in this forum have done it. I did find something in the cummins forum. apparently their tps cost $300+ and they already have this mod called tps delete. they paired it up with the TC unlock mod for passing gear.
My mod ( that im planning to do this weekend) is to pair the fipl with another 10k potentiometer. so basically im running the fipl and potentiometer in parallel except the last leg on the potentiometer and the ground of the fipl. My goal is to have an adjustable fipl from my dash with a volt meter. I did some maths and 10k potentiometer will be my best bet to have "mountain shifts" or "la traffic shifts". also fine tune it to 1.5v at idle and 4.5 at max throttle. its cheaper than a e40d trans controller (20 bucks) and i dont have to squeeze in the tight space under the hood. i save that for my girlfriend.

any thoughts? I want to get yall's opinion on this. anything I should consider? I have pigtailed a 2 pin watersealed connector to it and just have to plug in the potentiometer and a volt meter.

Hoping there will be lots of pics and explanation for this...

.8v is very low can it not be adjusted into spec? I’ve found that some fipl that won’t adjust into spec need the throttle shaft adapter reset with the fipl off.

I like your idea/concept

, I swapped mine for the updated fipl since I’m a 91 idit with e40d and haven’t had issues since

Slicknik said:

I swapped mine for the updated fipl since I’m a 91 idit with e40d and haven’t had issues since

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That picture as a manual selector switch. neutral switch

Im trying to upload a video on youtube. it will be up in a bit.

This is what the mod requires

Thewespaul said:

.8v is very low can it not be adjusted into spec? I’ve found that some fipl that won’t adjust into spec need the throttle shaft adapter reset with the fipl off.

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I havent tried adjusting it. It was raining last weekend and the truck needs to run for a living. Ive been downshifting manually for now but Ive been getting terrible mileage for a while now.

Christian9112 said:

This is what the mod requires

You must be registered for see images attach

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Where is the flux capacitor?

Christian9112 said:

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I thought the original fipl/tps increases with throttle to supply proper voltage to each of the shift solenoids. How will you change to proper voltage for each solenoid ? What is the advantage of this set up/mod over the stock tps? It would be nice to have a volt meter of stock set up to monitor while driving.

Now if you can make a kit. Plug and play. I'll buy it

eacars said:

I thought the original fipl/tps increases with throttle to supply proper voltage to each of the shift solenoids. How will you change to proper voltage for each solenoid ? What is the advantage of this set up/mod over the stock tps? It would be nice to have a volt meter of stock set up to monitor while driving.

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The TPS sends a reference signal ( increased voltage) to the TCM. The TCM uses this signal to increase or decrease the voltage EPS solenoid. This is the only variable force solenoid in the pack.
SS1, SS2, CCC, and CCS solenoids are on off. Changing the voltage to them will do nothing.

trackspeeder said:

The TPS sends a reference signal ( increased voltage) to the TCM. The TCM uses this signal to increase or decrease the voltage EPS solenoid. This is the only variable force solenoid in the pack.
SS1, SS2, CCC, and CCS solenoids are on off. Changing the voltage to them will do nothing.

Click to expand...

Wow! I wasn't even in the ball park. I should of stayed out of this one. Thx.

Update video.
I added a new center console.