Megasquirt owners thread

[NicTheMx5]

turbo.
I think I might just make the trip back to TAS performance. Worth having the same guy tune it again I think

[Cus]

So had a whole post typed up complaining about that previous picture, due to it being "wrong" it's not, it's just really ... not the best datasheet I've seen.

Well, that, and I'm an idiot.

Anyway, making this:



Single-sided PCB (for home-etching) to put an MS3Pro module into an NA6 case with the OEM connector.
Plan is to use a spartan2 WBo2, GM MAP sensor (so I don't have to run a vacuum line), VTPS, COPS, flex sensor. Has a BT dongle (no idea how well that's going to work inside a metal box) and on-board baro correction.

[Red_Bullet]

Replaced Fuel pump and fuel filter, which involved removing both seats and roll bar .....one screw was under the harness mount strap, thrown that screw away now....went for an autotune with the megasquirt, looking good, hitting afr targets now.

[datfreak]

Hi guys,
im considering buying a MS2357-C - http://www.diyautotune.com/catalog/megasquirtii-ems-system-smd-pcb357-assembled-ecu-p-171.html over the pnp model due to costs.

this is for a na6 that could later have a 1.8.

I'm ok with the ms2 brain being a little simple, as long as it keeps the AF good and is reliable.

As for wiring I was thinking of 3 options:

1/ running a totally new loom to the engine.

2/ buying a borked na6 ecu and desoldering its plug and using this to connect the ms2

3/ Identify the wires at the std ecu and cut them off and resolder them to the db37 ms plug. If I later decide to mod the wiring for COPS, ill run extra cable.

Im favoring option 3 as Im a bridge burning kind of person. What do people here think?

Anything special to setup the ms2 3.57?

http://www.diyautotune.com/tech_articles/how_to_megasquirt_your_mazda_miata.htm lists some some extra things to do to get the CAS working, but lists the MegaSquirt-I PCB3.57 ECU...I think it means ms2 3.57 but... ?

[gslender]

All depends on how much you know about electronics and if you have the patience. It is fairly complex and not easy at all. Option 2 is worth considering as you can then plug the stock Ecu back in when you get frustrated and check that the engine still starts etc


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[bartmanftw]

Option 2 is what I'd do as you can still plug the OEM ECU back in if you need to. Or you could get this adapter board to make your life easier. http://www.diyautotune.com/catalog/diyb ... p-411.html

[datfreak]

ok thanks guys, Ill have a lookout for a dead na6 unit or another standard ecu with the same plugs, mazda 323 maybe?

ive got a ms2 3.57 in the post coming so.. ill start reading up on it.

I did alot of aftermarket tuning with microtech ecus in the 1990's(and cooked 2 x mazda b6t engines with leanouts and killed another with bent b6 rods) , then did weber dcoe tuning on datsun 6 cyls. Its been a long while but it will be interesting playing with a programmable ecu again. saying that, the ms seems on paper to be 1000% better then the old microtech

It doesn't have a harness with it so is it ok to buy a db37 connector from jaycar and solder the needed pins? I was concerned if the cas or the ignition wires need to be shielded?
I'm hoping the pnp maps will work on the ms2 3.57, as they seem to be a decent baseline to work with

The to do/ to buy list:
1/ get db37 connector and shell from jaycar with cable.
2/ get wideband o2 sensor and controller, maybe gauge. Prob a bosch unit as they seem less expensive
3/ get knock sensor
4/ get dead na6 ecu or equiv for plugs
5/ get vtps

On the unit itself:
1/ mod ms for na6 cas - resistors and such
2/ firmware update?
3/ load pnp maps
4/ some work around for pump relay control as the AFM does this at the moment.
5/ lots of db37 to na6 ecu patch cables
6/ 50+ more things

[Cus]

The male plug to fit the NA6 and NA8 factory ecu wiring harness is:

64 Pin Male connector (174518-7)
.040" Contacts (175061-1) (female)
.070" Contacts (173631-6) (female)

Mouser electronics have these.

Happy days

Happy days indeed!

I need pictures of the backs of people's (stock) NB ECUs pretty please.

At the moment all of the factory connectors I've worked out are:

The NA6 connector is part number: 174917-1 (Two sockets: 26 pins + 22 pins)
The NA8 connector is part number: 174518-7 (Three sockets: 26 pins + 16 pins + 22 pins)
The NB8A connector I think is the same, but I need photos to confirm.
The NB8B connector I believe uses three of the four sockets of part number: 174915-6 (Four sockets: 26 pins + 16 pins +12 pins + 22 pins) But I need pictures of it so I can find the exact part.

SO. If you have an NA6 and get the NA6 connector, you'll have about 12-ish empty holes in the OEM harness. That's where the .040 and .070 contacts come into it - extra wires out of the MS just by populating empty holes!

The NA8/NB8A connector has an extra plug, so if you were to use that in an NA6, along with part number 917981-2 and 16 of the .040" connectors, you can have a whole extra 16 wires on one plug to the MS, plus the 12ish from filing in the factory loom.

The part number I've got next to the NB8B connector also takes plug part number 175442-1 (I think, datasheet looks good) for an additional 12 Wires on an NA8/NB8A, or (maybe) 22 on an NB8B (this plug is used instead of one of the end ones)

I'm not sure how many spare spaces there are on later model ECU plugs, photos of the insides of the plugs would be great too

Oh, and the part numbers all come from here: http://au.mouser.com/TE-Connectivity/Au ... b5Z1yq277o

It is only the connectors that are in the same series as the ones the ECUs use, so most of those aren't the right ones, but if you have something to compare it to and you're prepared to sift through data sheets, enlightenment is possible.... ...or insanity...

[bartmanftw]

Happy days indeed!

I need pictures of the backs of people's (stock) NB ECUs pretty please.

The larger NB8A plug is the same as the larger NA6 plug if that helps. The other one has 16 pins and is the same as the circled one in the pic. I'm pretty sure the same plug for NA8 can be used for NB8A.
NB8A harness into NA6 plug

Connecter on the DIYPNP board

Hope that helps.

[Cus]

Are you saying there's an NB loom that's two plugs of 26 + 16?

I managed to dig these up from mt.net. which lead me to belive that the NBs were three plugs (26 + 16 + 22)








Imgur Album: http://imgur.com/a/yykoo

The "2002" (SE?) ECU pinout/connector looks to be wildly different, no idea what plug we'd need for that: http://www.bellengineering.net/template ... iagram.pdf

Otherwise, I think this basically covers all of the bases as far as ECUs in NA/NBs go? There's no '98, is that even a thing?

I also suspect the 96-97 pinout may be incorrect (power moves to a new pin, then back again on the '99) can anyone confirm or deny this?

[bartmanftw]

According to the DIYPNP guides the '94-'95 and '96-97' na8 harness does have a different pin layout and I'm pretty sure those diagrams are correct.
Not 100% sure about the 1999 harness but the JDM engine harness I got with my engine only had two plugs for the ECU however I could just be missing the third one.

[smy0003]

I remember reading that the US never got a '98' since it was slightly delayed and they weirdly like to name their model years one year in advance.
So their 98 was a 99.

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[gslender]

DIYAutoTune have advised they are going to have a 10% off sale on Friday November 27th and run through Tuesday @ MIDNIGHT PST (3AM EST).

Might help a little with softening that USA to AUD conversion!

G

[datfreak]

Hi, need some megasquirt advice.
I've bought a mspnp ms1 (3.57 board with ms1 cpu) from these forums sales and the car starts up ok but breaks down under load.

Ive noticed that the map sensor (in tuning studio) reads 61 kpa - even with the motor off.

Is there anyway of calibrating the map? -
I live up the range but expected 95-100
thanks for your thoughts

[gslender]

Hi, need some megasquirt advice.
I've bought a mspnp ms1 (3.57 board with ms1 cpu) from these forums sales and the car starts up ok but breaks down under load.

Ive noticed that the map sensor (in tuning studio) reads 61 kpa - even with the motor off.

Is there anyway of calibrating the map? -
I live up the range but expected 95-100
thanks for your thoughts

Unless your above 4,000m above sea level, I'd say that MAP sensor is broken or not calibrated in the ECU.

I'd also be unsure what to say about using an MS1 other than "good luck" !!

G