LLY Ficm

kidturbo

kidturbo

Piston Tester
Jul 21, 2010
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1,377
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Somewhere On The Ohio
www.marinemods.us
Quick stat for the techie crowd. While recording the balance rate above, I was also capturing the raw injector pulse signals from the ECM on the 5v lines.

Screenshot 2024-08-30 045757.png

If you zoom into each individual pulse, and compare main pulse times [tagged on right], to the Bal Rate PID values, one can see how the ECM adjusts individual pulse times to compensate per stoke. All the pilots are pretty much identical. But at idle, the mains all vary according to crank acceleration or deceleration. And our +/- in Balance Rate values equals out to some X% of our above PW times. IE: 7 & 8

Reason we gotta be pretty spot on with our recorded pulse times, or ECM tries to correct based on what it last sent down the pipe...
 
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2004LB7

2004LB7

Well-known member
Dec 15, 2010
6,993
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Norcal
Little more cruising around the neighborhood with the FUCM board after fixing some little issues and making some minor changes to the board. Running pretty good now. Very drivable. Almost like stock. Most might not even be able to tell the difference

Source: https://youtu.be/GUskKERdNHE


And a hard acceleration to see what the smoke looks like

Source: https://youtu.be/WwuaICXQurk


Balance rates in drive look good but main rate is still about half expected and in neutral it zeros out. So there is probably too much PW being added or the injectors are not turning off as quickly as they should so slightly more fuel then needed. New board is supposed to be able to address this. So we will be starting to migrate the code to that one soon

IMG_20240907_145701-01.jpeg
 
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C

Cougar281

Well-known member
Sep 11, 2006
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St Louis, MO
2004LB7 said:
Little more cruising around the neighborhood with the FUCM board after fixing some little issues and making some minor changes to the board. Running pretty good now. Very drivable. Almost like stock. Most might not even be able to tell the difference

Source: https://youtu.be/GUskKERdNHE


And a hard acceleration to see what the smoke looks like

Source: https://youtu.be/WwuaICXQurk


Balance rates in drive look good but main rate is still about half expected and in neutral it zeros out. So there is probably too much PW being added or the injectors are not turning off as quickly as they should so slightly more fuel then needed. New board is supposed to be able to address this. So we will be starting to migrate the code to that one soon

View attachment 125758
Click to expand...
Nice! I need to make a setup like that for the T87 testing so the T87 and interface module can sit on my dash while testing lol.
 
2004LB7

2004LB7

Well-known member
Dec 15, 2010
6,993
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Norcal
Cougar281 said:
Nice! I need to make a setup like that for the T87 testing so the T87 and interface module to sit on my dash while testing lol.
Click to expand...
Definitely helpful when you need to hook the scope up and see what it's doing while the engine is running. Plus you can see all the pretty lights on it 😁
 
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D

DuramaxNWA

New member
Feb 23, 2022
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Incredible work so far, y'all! Really would love to see these be readily available. The LB7 and LLY trucks deserve to live on.
 
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