Ms3 MS3x on a MSM
 

Anyone got a basemap for a msm? Car is basically stock with a set of supra 305s, and ebay downpipe. I've about got the ms3 ready, hoping to get everything tested and maybe a rough tune tomorrow.

I keep forgetting to order parts for the alternator control circuit... so we're going to be a bit limited, hoping to get it roughly ready off the battery, then build the alt circuit this week and give the ECU back to them in time for the Autocross next weekend.... Probably a bit ambitious, but if everything goes well why not try?

I've roughly followed Frank Devocht's guide, which is obviously setup for a VVT NB, and I'm wondering what people do for EBC control. We've got a GM EBC, was hoping to splice into the factory EBC wires but it looks like the ECU switches 12v instead of ground. bastards. Does everyone just run new wires for it?

Also VTCS... Does it default to open or closed? I.e. do I need to worry about controling it for now?

not sure on the ebc, if its really switching 12v (that doesn't make sense to me)

VTCS would be simple using a spare INJ output on the expander.

The ECU diagram from your site says that its switched 12v... Does seem a bit silly though.

Fun note: 04s (at least) aren't wired for power like the 01s are... Frank's instructions don't mention at all that you have to turn the Main Relay on for these later cars... 4s is key switch on power, 4AF is in fact a red/white that doesn't have power till you ground 3h to turn the main relay on.
Wish I had had the factory ecu diagram when I built the harness, as is I looked like a fool until I traced where the black/white (key-on 12v) source actually made it to the ecu.

So... whats the preferred way to flip the main relay on? I'm thinking i'll just use a spare pin on the ms3x to say if coolant > -120 or something and just have it always on... I would try the Fuel pump driver, but don't want to burn it out... Actually, you'd never get crank/cam signal to bring up the rpm to trigger the FP relay if the cam and crank signals don't have their 12v turned on....

the ECU grounds the relay through pin 3H. So ground 3H and that should do it.

You'll have power through 4AF.

The problem with that is the other side of that relay is always hot... So if you just run that pin to a ground the main relay will never turn off.

let me look at diagram again, but im positive that's all Reverant does for his MSM units.

EDIT: I dont think the diagram is correct by showing A and C on the main relay connecting.

However, you are wrong. :brain:

I'm not looking at the diagram, but you wouldn't want the relay coil to be live the whole time. It would add to the dark current that discharges the battery when the car is off.

well fess up jabrony. I remember that being something we had to do for Stephanie's MSM unit. I guess it worked, but led to a dark current with key off?

Using an INJ output on the ms3x then would be an easy fix.

Stephanie's MSM was a race car, so that solution was OK for them. I have a different solution for the daily driver MSM.

I bet Ian would like to know...lolzlsalfdkslkjfgawgsadskates.

There's no fun in getting spoonfed.

tell that to Ian. lolz.

but if it were me, I'd just use a spare INJ output to turn on the relay...

Sounds like this is still the best/easy idea... Just need something that says 'if ecu is on ground this pin'... Plenty of spare outputs to play with on ms3x.

you can just default the output to being on normally. don teven think you need any conditioners.

so active, the like 1 | 0 for the settings.

most would be 0 | 1 and then a condition to turn on.

Ah... easy cheesy, haven't looked at that dialog box in a while. Now if I could just sweet talk reverant into sending me a basemap :)

does Reverant even have an MS3 MSM basemap? he would for his enhanced MS2 junk...

but anyways, load beta21.

I'll add this information to my how to.
So, if I understand correctly, 4S is the 12V ign source for the MS and a spare output is used to ground 3H once the ignition is turned on?
4AF is not used by the MS then?

4S looks to go directly to the battery, 4AF is behind the main relay.

I have no '04 wiring diagram, so can't check, but from this I understood that 4S is power when ign is turned on?

If 4S is battery and 4AF only turns on when 3H has been grounded by the MS, how do you turn on the MS?

here.

https://www.miataturbo.net/attachmen...1&d=1336055278

thx, all clear now.
4S is indeed 12V ign and 3H needs to be ground to turn on the main relay (which feeds the fuel pump relay, injectors, valves and sensors).
I'll add this information to my how-to.
Is this for all 01-05's ?

4t is vref from the alt, if i'd realized that I would have use it for the alt circuit.

On another note, on the MSMs there is a 2nd IAT which is on pin 4R, (I'm going to tap into those wires and run a GM open IAT).

Btw, got the car running pretty well, used the diyautotune 99 map. Stock msm ecu is so crappy, once I get the ebc wired up this car will be completely transformed, and even more awesome in bsp :-)

I would also like to add that setting the zero crossing pots is a bit of a pita. The suggested adjustment didn't work, got the old dmm out and set them and sync is great now.

Fun anecdote... Apparently ms3 has a VSS based AC disable. I apparently managed to set that set to 40mph without realzing it, lol. So until I can get to the car again his ac only works below 32mph or so as I neglected to set the tire diameter right. lololol.

yeah VVS or TPS. I turn mine off above 80% tps or something.

Which reminds me...why on earth did they put a TPS % to stop the cooling fan???

legitmate use of: because racecar.

IIRC some drag racers wanted the function.

User request from bracket racers IIRC.

So.... as it turns out, e85 with rx8 yellows on a mazdaspeed are definitely on the edge if you want to max out the turbo. I was seeing around 100% duty at 11.8:1 AFR (gas scale) at 6k rpm at 170kpa with 85 degree mat temps. GM Mat installed in begi intake elbow (right before TB basically).... So for blytheville it'll be ok cause its gonna be 900 thousand degress out there, but if he wants to drive it hard at night AFR safety system might rain on the fun.... Until they put some bigger injectors in it anyway.

Not 3M?

By any chance does one of you have a base map for the msm I could use? I'm about to install a msm motor once I finish my ms3x.

I seriously just laughed so hard I semi choked and started coughing.
Aside from that, all this MS3 talk is making me want to ditch my ms2.