V3 board mods?

All questions about MS2/Microsquirt/Microsquirt module. See also MS2/Extra manuals

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Modly
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V3 board mods?

Post by Modly »

I'm most of the way through my assembly, and left a few things out here and there that I'm unsure about.

Should I assemble the board as if it was a normal MS-II, or should I do what is described for MS-IExtra? I'll do the modification listed on the MS-II daughterboard, but that's the only thing I really found in the manual so far.

I don't intend to run the Extra code on my MS-II just yet (I want to get it running first and test out all my fuel system first), but within a couple weeks of having it fully operational, I'd like to impliment spark (Which I know MS-II can do by itself) and add Extra firmware, but I want to make sure I've got all my eggs in the right basket to do everything I want. Pardon the easter pun...

With all that said, I'm really excited right now about getting this thing done, and if the weather gets nice and quits snowing, I think I'll have my car ripped apart this next weekend to get rid of that carburetor.
jsmcortina
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Post by jsmcortina »

It depends on what ignition you are going to be running.

For single coil applications the wiring is likely to be identical.

For wasted spark the wiring is different because MS2 doesn't do wasted spark.

So I'd say go ahead and install as per the MS2 documentation.

James
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racingmini_mtl
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Re: V3 board mods?

Post by racingmini_mtl »

Modly wrote:I'll do the modification listed on the MS-II daughterboard, but that's the only thing I really found in the manual so far.
Do NOT do the dual spark MS2 daughterboard modifications which require you to lift pins from the MM74HC00 NAND. These are for running the microsquirt code which is not compatible with the MS2/extra code.

The MS2/extra code does not require any modifications to the daughterboard (at least not yet) for any combination of ignition outputs or tach inputs. The only modifications necessary are for additional GPIOs.

Jean
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Modly
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Post by Modly »

I was planning on doing wasted spark with it.

I guess I won't modify the daughterboard then. I thought it was something to do with the extra code, but I might have read that wrong.
jsmcortina
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Post by jsmcortina »

For wasted spark you will be taking the two spark outputs "from the LEDs" as per the MS1/Extra manuals.

Do I take it you are starting off fuel only?
Either ignore spark outputs completely for now, or wire the in and don't connect to any coils.

The board work you do need to do is:
-Choose a tach input either hall or VR and apply the appropriate jumpers.
-Run some jumpers if you are going to use four wire stepper idle.

You don't need to cut tracks or remove chips on the MS2 card itself.

Feel free to ask more here.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
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Modly
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Post by Modly »

Do I wire all 4 coil packs (8 cylinder) through the LEDs, or are there other outputs for the other two?

I'll get cracking into the MS-IExtra manual tonight and see if I can get the brief out of it, and hope I can get by without asking too many dumb questions.

Ok, I think I found my answer to that. I wire them to R1, 26, 27, and 29.

So I remove the resistor in R1 completely... and solder the others onto the resistors?

Do I have to remove the LEDs? I was thinking I could fit a DB15 under the board and have that connector below, or I could install the LEDs upside down, and make new holes underneath to keep them functional.
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Post by jsmcortina »

It works fine with the LEDs still in the normal place.

The output for Spark D is in a different place on MS2/Extra and you've exposed our weak documentation.
In the release code this is coming from "JS10" although for technical reasons more distant releases will move that pin.

So the present MS2/Extra V8 wasted spark wiring is:
Spark A take wire from top of "R26" to 330ohm resistor to VB921
Spark B take wire from top of "R29" to 330ohm resistor to VB921
Spark C take wire from top of "R27" to 330ohm resistor to VB921
Spark D take wire from JS10 to 330ohm resistor to VB921

Once installed you can you the "output test mode" to confirm that your coils are working correctly before first trying to start the engine.

As you are a new starter I would suggest you put this spark stuff on hold for a few weeks at least, get your Megasquirt built and running fuel only and then come back to spark once it is well bedded in and you have a good grasp of it all. There is a lot to learn in a fuel install and even more for spark.

Doing fuel and spark at the same time can easily become a very frustrating experience if (and when) it doesn't fire up first time.
Heh... even I started fuel only ... and I wrote most of the spark code.

It is best to mount the Megasquirt in the passenger compartment though (hidden up under the dash for example) as otherwise you could be exposing it to high temperatures, water and dirt which it isn't really designed for.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
muythaibxr
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Post by muythaibxr »

I actually started with fuel and spark, because the rx7 I started with had a bad ECU... And it was more expensive to get a new stock ECU than it was to get a MS. I would've started fuel-only if I could've.

It took us a month to get it running (working on it once per week), and all the problems were spark-related.

That said, now that I've done it several times, it's a lot easier.

Ken
Modly
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Post by Modly »

Ok, fuel only to start it is. I'll just modify the board later.

But the more I read in the MS-1Extra documentation, the more I like...
RickRST
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Post by RickRST »

i started spark only :)
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