Back on moparchem.com geoff allan attempted to make an adapter to go between the logic module red and blue connectors to a SMEC logic board. he didnt finish it and id like to. I have quite a few SMEC boards but i dont want to rewire my k car and i have a LM in it.
Rob, you can post that moparchem stuff here.
Brian
That would be cool, I like it in my glovebox.
later Dick Westerhof
This will be a cool project, I'll be keeping on eye on this thread to see how things come along.
Someone here has done it already i just cant remember the name.
Hey Brian, is this an adapter the goes between the harness and the SMEC itself?
Bryan
86 GLHS #161, 2016 Impala
SDAC National Member, SDAC Buckeye Chapter Member
A man has got to know his limitations.....
Ah found the link
http://www.turbo-mopar.com/forums/sh...hlight=smec+lm
I'll just grab a harness out of a turbo mini the next time I find one. Easier and the pm stays by the battery anyways. I was hoping to move it to make room for a cold air intake.
later Dick Westerhof
yep, thats it.Originally Posted by bakes
Bryan
86 GLHS #161, 2016 Impala
SDAC National Member, SDAC Buckeye Chapter Member
A man has got to know his limitations.....
Here's what I managed to save from CHeM. It's not much, unfortunately. As I recall, Geoff never got it to work right.
I was going to work on one of these, and I have a way of doing it without hacking up a a LM to pull the plugs off. I have a test LM-> megasquirt plug-n-play adapter at home, but haven't had a chance to test it out.
I have the LM male plug side figured out, I can post a pic of it later. It uses all new parts and plugs right into the LM connectors. I also believe I have a source for the new smec 60 way connector, but I haven't picked one up yet.
However there's at least 2 items that I discovered during the making of the smecstim:
It appears that the injector signals from the LM are ground switched while they appear to be power switched from the smec. I'm not sure if I'm just not doing something right but this is how it appears at the moment.
It seems that the CEL is also reversed, the smec supplies power while it seems that the LM switches it to ground.
Also, the coil signal from the LM is much weaker than the SMEC, but this may not matter if still using the LM power module.
I haven't looked at the voltage regulation signal, but I doubt that's changed.
I was going to put some transistors on my converter to convert these signals so all you had to do would be plug the 2 LM connectors into the board and have the Smec plug into the other end. Is there a lot of demand for this sort of thing? I can put the coil on plug setup on the back-burner if there's a lot of interest.
Excuse my ignorance......but whats the point? What is the advantage of running an SMEC over a LM?
The 89 T1 code (used in Turbonator SMEC) is much more advanced than the LM code. I believe the MCU is also a generation newer and faster in the SMEC.
Then there's always the 'just cause I/we can' argument...
Division! That's the big reason. The 6803 used in the LM does not have any built-in divide instructions. That makes it difficult to do a lot of calculations. It's also the main reason our tables are stored in the point-slope format. If they had a 6811 available in '84, they probably would have used a more traditional interpolation routine. But, without an efficient means to calculate the divisor, interpolation becomes cumbersome.
I've looked at finding or developing a drop in processor replacement for the LM that would use a 6811-based core. At least then, some of the code could be 100% compatible.
Are you speaking Greek?
I see now.The 89 T1 code (used in Turbonator SMEC) is much more advanced than the LM code. I believe the MCU is also a generation newer and faster in the SMEC.
Then there's always the 'just cause I/we can' argument...Gotcha.
im interested.
AJ's adaptation looks a little easier though. i may do that instead. lemme get more info from him to see which is the way to go.
Brian
Ok. Well, I'm still going to get to it eventually, but if you want to see it sooner rather than later LMK.im interested.
AJ's adaptation looks a little easier though. i may do that instead. lemme get more info from him to see which is the way to go.
Brian
Just to clarify, this mod would put a SMEC's logic board inside the car? or just the "logic" board part? With the point being to improve the electronics... If I'm clear on this part, having never dissected a SMEC, would the logic board fit into the LM case?
Mike
"The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government - lest it come to dominate our lives and interests." - Patrick Henry
Bad laws are the worst sort of tyranny.
- Edmund Burke
Yes, it would allow you to run the logic part of the SMEC instead of a LM. It won't directly fit in the LM case. I can post a picture later if you want of the 2 side-by-side, I have a few laying on my desk at home. If you wanted to hide it behind a kick panel, you might be able to do that, but the connector + the SMEC logic board is probably 3-4 inches high.
Id be very interested
Ok, well what I'll say is this: I think I've got the final redesign of the COP setup (which will now handle t3 style coilpacks too
Later in the week, I'm going to start with the LM -> megasquirt adapter I have in-hand. Once I get that working (give me 2 months, min) the smec adapter should be easy to knock out. I'll have already figured out all the signaling needed for the LM's PM and it should be easy to translate the SMEC version.
So, reasonably, I think I'll have *something* by mid-late June.
Posting Permissions
Reply With Quote