I have not done that yet. I also have to go thru the harness. Regardless of the issue I am still very interested in this FUCM development.
LLY Ficm
- Thread starter mplecha
- Start date
If this 90° delay is indeed true then I only see three practical ways to deal it it on our own FUCM.
Add the necessary timing to the tune to account for the lack of the same delay in our own circuit. This is the route I'd take for my own truck
Reclock the reluctor wheel
Or add a programmable chip, such as the Arduino to the board to intercept the control signals and match them up with the crank signal before outputing it to the driver circuit
Option one is easy but doesn't help those who can't or don't want to run altered tuning.
Option two is impractical for the vast majority
Three is probably what we would have to do. Maybe incorporate a Nano on the board.
Add the necessary timing to the tune to account for the lack of the same delay in our own circuit. This is the route I'd take for my own truck
Reclock the reluctor wheel
Or add a programmable chip, such as the Arduino to the board to intercept the control signals and match them up with the crank signal before outputing it to the driver circuit
Option one is easy but doesn't help those who can't or don't want to run altered tuning.
Option two is impractical for the vast majority
Three is probably what we would have to do. Maybe incorporate a Nano on the board.
I captured this during a drive yesterday. I believe it was about 1500 rpms. looks to be about 9mS between the control and the main injection. I'm not 100% on the accuracy if it though as my scope wasn't reliably capturing the intermittent signal. feel free to calculate the crank angles for that duration. my brain's math processor doesn't seem to be working at peak efficiency today.
For the masses I think option 3 is the most ideal. It allows a plug-and-play unit that would need to be configured as either an LLY or LB7 before shipment (maybe internal jumper that is locked in position with the case? IE it cannot fully be removed unless the case is separated).
This thread has become very important, so I sticky'd it so we never lose the info.
If it truly is purposely delayed 90° then yeah an onboard IC to do the math is the way to go. Just one extra point of failure I was hoping to avoid. It's also not a direct swap of parts but would also require programming. Which we can do are best to make available and have backups but the Internet does change and things get lost. We can't always guarantee that 10 or more years later someone still driving their LB7/LLY will be able.to find the program. But we know replacement components will likely still be available.
We need to verify that it's actually delayed or not. And if so is it 90° or something else.
Another question that is likely relevant is, how is the reluctor positioned with respect to cylinder TDC? Is the missing tooth at that position or somewhere else? That would be helpful to know when making the programming or even verifying the injection pulse compared to the crank signal
When this thread gets far enough along or comes to it's conclusion, would it be possible to distille the important data to another sticky or at the top of the thread? It's already beginning to become a long read with many more pages of data likely to be added. One or more of us will have to run back through from the beginning and note the post # and we can copy those over.
Ok, my math says 81 degrees
360 degrees x (1500 RPM/60) x 0.009 seconds
So depending on the exact RPM I was at it very well could be 90° delay
Math says it would be at about 1670 rpms to have a 90° delay. Seems reasonable
Someone ping @MarkBroviak to share some Picio tool logs on this. Bet he can spit that tooth to TDC number out in his sleep...
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Yes. You'll have to help me with it, though.
I sent a PM to Mark with the thread link, asking him to stop in and help out.
Some goodies showed up at my door today 
This one is from Alibaba. Tested the connector with my trucks harness and it mates perfect. So I can confirm that the connector 368255-2 is the correct one. The photos on the site made me believe the case was a full size one. But it was infact a half size. I'm betting we can still fit a custom FUCM board in it
This one also showed up. Sadly it doesn't mate up and it doesn't look like a simple tab is in the way. I'll see if I can modify it for my use. It's also not fully populated with all the large pins so it might just go in the parts bin. I'll open up the ECM though and see what goodies are inside. If nothing else it looks like a good case to transplant the FICM board into for relocation.
This one is from Alibaba. Tested the connector with my trucks harness and it mates perfect. So I can confirm that the connector 368255-2 is the correct one. The photos on the site made me believe the case was a full size one. But it was infact a half size. I'm betting we can still fit a custom FUCM board in it
This one also showed up. Sadly it doesn't mate up and it doesn't look like a simple tab is in the way. I'll see if I can modify it for my use. It's also not fully populated with all the large pins so it might just go in the parts bin. I'll open up the ECM though and see what goodies are inside. If nothing else it looks like a good case to transplant the FICM board into for relocation.
Did you recall if they list any dimensions for the cases on alibaba???
Good find on the connector side.
Good find on the connector side.
I looked back at the item and sure enough it does show dimensions. But the photos look larger and that's what tricked me
Sorry, been bending Mark's ear for past hour.. Said he took one look, saw 25 pages of posts, and said WTF these guys trying to accomplish.
He dug thru some old data, then reminded me that we probably posted pics of the Pico tool logs over in the Twins thread, when we were investigating that misfire issue. His files are all on a dead PC. But I might saved on my old pc.
Either way, setting in other room I have a lmm with heads off. So can pull the sensor and count from scratch if need be. But we both recall there is an offset of xx teeth toTDC#1. Also he confirmed there is no timing offset change from lb7 to lly. That happens in lbz..
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He dug thru some old data, then reminded me that we probably posted pics of the Pico tool logs over in the Twins thread, when we were investigating that misfire issue. His files are all on a dead PC. But I might saved on my old pc.
Either way, setting in other room I have a lmm with heads off. So can pull the sensor and count from scratch if need be. But we both recall there is an offset of xx teeth toTDC#1. Also he confirmed there is no timing offset change from lb7 to lly. That happens in lbz..
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Cause my phones auto correct prefers lmm over lly when i misspelled it...
Updated it. Change occurred with lbz release. Stands to reason, ditched the ficm, lost the lag..
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So the new connectors are good, case is bad fit. Easy enough for starters.. Got us on the right track, and found a deal on the connectors at least. Nice work.Some goodies showed up at my door today
This one is from Alibaba. Tested the connector with my trucks harness and it mates perfect. So I can confirm that the connector 368255-2 is the correct one. The photos on the site made me believe the case was a full size one. But it was infact a half size. I'm betting we can still fit a custom FUCM board in it
View attachment 117868
This one also showed up. Sadly it doesn't mate up and it doesn't look like a simple tab is in the way. I'll see if I can modify it for my use. It's also not fully populated with all the large pins so it might just go in the parts bin. I'll open up the ECM though and see what goodies are inside. If nothing else it looks like a good case to transplant the FICM board into for relocation.
View attachment 117869
I'll post up a RFQ over there using your connectors and our ficm dimensions. Should get a few options, all from exact same town I'm sure..
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