Megasquirt MS3Pro Mini ECU

[Hugues]

I finally decided to buy an ECU for my Pinz, first to monitor its advance and exhaust gas,
then when everything is stable i will drive the advance with it instead of my distributor,
maybe one day upgrade to EFI but that's not sure yet,
I bought this gear from
https://www.diyautotune.com/product/ms3 ... w-harness/
MS3Pro Mini Standalone Engine Management System w/ Harness
Crankshaft / Camshaft Position Sensor - Hall Effect tab mount
Innovate LC-2 Digital Wideband Controller with Sensor - 38770
GM IAT Sensor with open element & pigtail
GM Closed Element CLT/Oil Temperature Sensor with Pigtail
I still need to order the smart coil module:
https://www.diyautotune.com/product/ign ... coil-pack/

I installed it today and connected it to my laptop,
the only data i have for now is Manifold Air Pressure, as can be seen in below video,
I will install a trigger wheel on the crankshaft pulley, wideband O2 sensor and temp sensor.
I intended to buy the Speeduino initially but it was either out of stock or the shop did not reply to my mails,
Carl at diyautotune was pretty good to reply to my questions,
https://youtu.be/x-Jh8YTtFbI?si=HIgRGugz6zM47hMs

ms3pro mini ecu.jpg (312.96 KiB) Viewed 4511 times

[Hugues]

Installed the O2 sensor and the 36/1 toothed wheel this long week-end

With the O2 sensor, already saw that my idle fuel mixture was too rich, so adjusted the carbs live with the O2 sensor, no more guessing for me.

short video here:
https://www.youtube.com/watch?v=sEBzG3iG8Yo

IMG_20240511_144557.jpg (609.4 KiB) Viewed 4360 times

[rmel]

Curious.... Where did you install the O2 sensor?

[Hugues]

Curious.... Where did you install the O2 sensor?

Yes good question,
On the green circle below.
Right on top of that pipe, 12 o'clock,
Had to be at least 60cm away from engine exit.
And this way I measure the combustion of both carbs.
Had to remove the exhaust between the engine and the heat exchanger to weld the bung, a bit of a pain.

o2 sensor.jpg (269.89 KiB) Viewed 4308 times

[Hugues]

Received my new coil today, to use with my ECU to control advance.

Little connector problem. I have the civil ignition spark plug cables, on the distributor side, it's a male connector, see 1st picture below.

But on my new coil there is a different connector. The rubber cap fits onto it, but inside it's not a female connector but a male connector.
Technically the tip of my current male connector would touch that male connector pin on the coil, but that does not sound like a good idea.
Anyone knows what kind of connector is this on the coil side ? I could buy or build an adapter, but not sure what to order.

This is the coil I bought: https://en.ridex.eu/product/8055482


male connector on the spark plug cable

male connector spark plug cable.jpg (604.84 KiB) Viewed 4153 times

coil side, male connector

male connector coil side.jpg (545.64 KiB) Viewed 4153 times

[VinceAtReal4x4s]

M4 connector?

[Tjerk]

https://simonbbc.com/cap-ht-lead-terminal-straight/

[Hugues]

Tested the timing advance from my Megasquirt ECU for the first time today,
No major issue, advance is ok at idle and around 2'000 rpm,
I'm using the Pinz manual advance curve for now,
once i've got everything under control, i'll explore a bit the other advance functions, taking into account engine load for example.

a bit more info here:
https://youtu.be/ubd-Mtm6sg4?t=101

[Hugues]

So my idle advance was stable so I decided to give it a try.
I first built the advance table based on the Pinzgauer manual, so purely based on rpm, not taking into account engine load, red corridor on bar chart below.
It ran ok but when starting to go uphill at mid rpm i had a bit of backfiring through the air intake, so probably firing too late.
So i then adapted my advance table to take into account load, but always stay with the Pinz manual red corridor.
Backfiring is now gone. Only impression is that power could be improved under load going uphill.
Should I push my advance beyond 28 degrees in these conditions (under load going uphill) ? 32 degrees maybe at first to see if it makes any difference ?
Running unleaded 95, at around 600m altiitude / ~2'000 ft
I show the advance chart shared by @rmel in this thread:
viewtopic.php?p=93655#p93655

edit: after a bit of reading, i might have modified my advance table in the wrong way, looks like for a specific rpm, say 2000, as engine load increases (less vacuum), advance should decrease. My table below would be wrong then...

My current advance table:

advance map.jpg (296.36 KiB) Viewed 3752 times

advance chart used by rmel , under load

advance rmel.png (296.04 KiB) Viewed 3752 times

[Hugues]

Just to update this thread if ever someone goes the same way,
This is the ignition table i've been running with these past 2-3 weeks, looks good, could be tuned better, but good enough for now

ignition table.jpg (315.11 KiB) Viewed 2929 times