LLY Ficm

[kidturbo]

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.



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...

 

[Cougar281]

If anyone has a set of LLY connector pigtails laying around that need the dust cleaned off, please get in touch. Seems our Duramax scraps pile is light on LLY harness hardware.

Inbound

 

[kidturbo]

SWEET !!

Ya score that ECM with those connectors?

If so, would call that a stellar day at the old bone yard..

 

[Cougar281]

SWEET !!

Ya score that ECM with those connectors?

If so, would call that a stellar day at the old bone yard..

Lol nope. The ECM is my EFI licensed ECM that I took with me to make sure the connectors worked. Could have grabbed a few P12's or a 05/06 Northstar ECM though lol.

 

[kidturbo]

Here is another video of the FUCM running a few days back. What it looks like logging the pw values, and how I caught that difference in bank balance. Trying to learn this Resolve video software, like learning to tune.. But I have one more of exhaust shot I can share.

Source: https://youtube.com/shorts/CEaKPIwzUmw?

 

[kidturbo]

Sounds pretty good out the pipe. But to the keen ear, one can tell a difference, as you can from the front.

Source: https://youtube.com/shorts/yFzsTK0HesM

 

[2004LB7]

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

 

[Cougar281]

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

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]

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.

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

 

[Cougar281]

No pretty lights on the T87 stuff, but hooking up a scope, yep, that makes it easier.

 

[kidturbo]

That's looking better in the mirror.

Sent from my SM-S901U using Tapatalk

 

[kidturbo]

We cooking with gas now...

 

[1FastBrick]

careful with that gas... your in a drought area and Diesel trucks don't like gas...

 

[DuramaxNWA]

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