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Old 04-07-2007, 09:43 PM   #1
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Default MSII V3 question

All the notes i've been taking have been for the MSI so now i'm
looking for other users on here running the Daughterboard instead of
the black processor.

I'm not quite finished building mine because i got stuck on some questions, I'll revice what steps I've skipped and post. I get communication, the gauges on the laptop react to the stimulator so i'm on the right way, i just don't know if this one Mods like the MS1 and if the harness for this one is different. I need pics if anyone has some...
Thanks in advance...
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Old 04-07-2007, 10:02 PM   #2
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What year car is this going on?
Arga is your man when it comes to MSII.
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Old 04-08-2007, 01:15 AM   #3
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oh i forgot i changed my sig...
updated sig...


OK, i want to control fuel and ignition, I'm not sure
but i want to get rid of the AFM if possible and i don't
want to use the MSD timing retard unless i have to.

First Questions,
1) Do i want to use PWM idle valve?
2) Do I populate the high-current ignition driver circuit?
3)"However, you can only trigger off the coil's negative terminal if you are NOT trying to control ignition timing" does this mean that in my case i would trigger from the positive terminal?

Last edited by Mouglie; 04-08-2007 at 01:36 AM.
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Old 04-08-2007, 03:10 AM   #4
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If you are controlling timing then you can't trigger from the coils or it would be a chicken and egg problem.
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Old 04-08-2007, 03:27 AM   #5
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1) Yes, use PWM with the bigger TIP122 transistor. (full disclosure: I'm still letting the stock ECU control idle air)
2) No, don't build the high current circuit as described in the Mega manual.
3) You cannot control 4cyl wasted spark ignition with the instructions in the Mega manual. The sentence you quoted is assuming a distributor and a single coil. What it really wants is a pulse for every ignition event. The cam/crank angle sensor can provide this. Verify this with another 93 owner but set your board up as Hall sensor in step 50.

You have several interesting options to you for controlling spark w/ MSII, but all of them involve unknown territory.
MSII Extra should be out in a month or two.
The current beta code (2.86) can do 4 cyl wasted spark but the instructions are indecipherable. http://www.microsquirt.info/dualspark.htm
(Just checked; it looks like they were updated a few days ago but I haven't read them yet.)
I used a simple circuit with a D flip/flop and an NAND gate to split the spark to the two coils. If you're interested I can explain further.

Removing the AFM won't be a problem with any version of Megasquirt.

As of right now, MS 1 is the better option. Better code base and a lot more support both on this form and elsewhere. There is a lot of cool stuff in the pipeline for MS2, though.
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Old 04-08-2007, 03:55 AM   #6
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Just read the new "dual spark" instructions for the MSII beta. It still isn't exactly paint by numbers but it looks like you would want option 2a. This is the line that bothers me:

"The additional ignition input is taken from the Injector 1 PWM processor pin and the second ignition output comes from the Injector 2 PWM pin."

Don't we only need one new input for the cam signal? Are they talking about pins 21 and 22 on the daughter board? Don't I (we) need those for fuel? It makes no sense. It is near midnight, though. I could just have the dumb.
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Old 04-09-2007, 12:12 PM   #7
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MS2/Extra actually came out just this weekend. The documentation is a bit sketchy right now, but here it is:

http://www.msextra.com/ms2extra/

The spark output with the MS2/Extra should be the same, but the input mods are a bit different.
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Old 04-09-2007, 05:09 PM   #8
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Great news. Thank you.
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Old 04-14-2007, 04:15 PM   #9
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had to take my laptop to the engineer that sold it to me cause the monitor isn't turning on. More delays for my project!!!
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Old 04-14-2007, 07:24 PM   #10
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Looks like MS2/Extra is going to be the way to go. Things just got a whole lot easier for MS2 users. There is even a spot for 99/00 Miatas http://www.msextra.com/ms2extra/ms2ignition.html#miata

SH!
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Old 04-14-2007, 07:41 PM   #11
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Nice, sweet stuff. Might end up being a few more MSII miata's running around.
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Old 04-14-2007, 11:02 PM   #12
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Looks like Reverant (CrystalBlue) has been the one feeding them info. Thanks Reverant!
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Old 04-19-2007, 08:25 PM   #13
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Pls Hlp!!!
I'm getting closer to the date of installing my turbo and my MSII isn't ready... (i'm freaking out, hahaha) anyway for the wiring harness what should i do? I'm thinking about buying the harness they have here http://www.diyautotune.com/catalog/m...eady-p-43.html
is this the correct one?

from there i think it should be self explanatory to wire it in
to the car...
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Old 04-20-2007, 02:10 AM   #14
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Don't underestimate the wiring harness!

It's sounding like you will be the first to tackle MS2/extra. You might not want a pre-built harness unless you're sure of the pin-outs. DIY sells wiring bundles in 12' lengths. Essentially the same parts but if a change is needed you can make it easily.

You might also consider a 93 Miata specific patch harness if you're wiring MS in parallel w/ the ECU. Boomslang makes one. There's another company, too, but I can't remember the name. (Autosport?). The DIY harness gets wired into the patch harness and you plug the patch harness between the stock harness and the ECU.
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Old 04-20-2007, 02:17 AM   #15
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a bit late, now i just hope i got the right one...
i got the $48 one from DIY. I'll make some changes to it
if i need to but i really want to have this finished already, lol..
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Old 04-20-2007, 03:24 PM   #16
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wow, not much support for the MS2 V3 on soon to be FI NA miater!!!
Hahhaaa!!! i feel like i'm burning up my brain here, hopefully i'll lead the
way to many miaters!!!
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Old 05-04-2007, 05:29 PM   #17
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please help!!! gah gah!!!

I feel stupid but i gotta ask...
VR-Variable Reluctor, it says to populate the area and make the selection via jumpers. (step#50) well i've done the Hall jumpers but i'm wondering should i solder the resistors in the VR steps?

and the "IAC stepper Motor"
I'm still trying to see if this applies to our cars in any way.

I'll start wiring this Monday if weather permits, lol...
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Old 05-04-2007, 05:42 PM   #18
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The VR circuit details should be left out. We don't have an IAC stepper motor, we have an IAC solenoid valve.

Jim
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Old 05-05-2007, 12:26 AM   #19
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Thank you my friend, you have released me from this confusion hold,
let the madness begin!!!

"On my command, Unleash Hell!!!"
-Gladiator
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