So my UK spec NA EGI is slowly coming back together, and I'm starting to think about what sort of Engine Management to go with, the standard EU cars came with fuel iniection, but still used a distributor for the ignition timing. They also had the thermal reactor and different vacuum plumbing to your USA cars.

To cut a long story short, I want to go full standalone, it should run a whole lot better and the the old engine loom is literally falling to pices anyway.
For timing I've got an FFE magnetic pick up trigger wheel.
Intake will be remaining the same, I'll add a MAP sensor and dispense of the old MAF arrangement.
Exhaust will be racing beat system with a wideband.

I'll need an output to run the solenoid that activates the 6 port system, on UK cars we have a different system, the aux ports are held open with a spring but closed by manifold vacuum at low engine speeds, controlled with a solenoid.
I'll be using high impedance injectors so no issues there.

Can anyone think of any reason why it wouldn't be suitable? Everyone seems to go for the fully loaded MS3 pro, but it seems kind of excessive, for what I need at least.

 

 

I would do ms2. More cost effective, enough IO for cars. Microsquirt has very limited IO options. As mentioned already look at th capability of each.

 

Thanks for the replies.
When you say Megasquirt 2 seems a bit of an ambiguous term, I thought it was the one that came after MS1, but it seems that we have a few versions of MS1 and then MS V3. (Which I thought was just MS3)

https://www.diyautotune.com/support/...tems-compared/

Looking at the list however it seems that Microsquirt would do anything I need, its actually cheaper here in the UK than the MS2 V3.0. And I'm not fussed about massive IO as this is a fairly limited application, I really just wanted to make sure I wasn't forgetting some crucial required feature.

 

Micro is simple and just as good. Running fuel only, it's plenty. Good luck.

 

Well I plan to use it for ignition as well, but it does appear to support it.

 

I would personally do an MS3X. I had an MS2V3.0 and an MS3X and you couldn't have paid me to go back to the MS2. Granted, this was on a turbo car, but the extra I/O is much appreciated, the firmware is loaded with many more features, and it's still actively being developed. I also had way less sync issues with the MS3X but that shouldn't be an issue with either with the FFE. With the MS3X, I was able to datalog oil pressure, exhaust temps, oil temp and actually do stuff with that info. This may not be of value to you, but for me it was at the very least peace of mind.

Oh, and the biggest advantage no one ever bothers to mention - the MS3 doesn't momentarily stumble when you burn a change to the ECU. Once you DON'T have the stumble, it's hard to go back!

 

Microsquirt should work if you don't need the extra inputs amd outputs.

 

I ran microsquirt modules on multiple RX7's and other cars aswell, works fine.
I usually just buy the v2.2 module (MicroSquirt® Module by Bowling & Grippo ©2009) and fit that into a box myself:




If you add a few transistors you get 4 ignition channels and 4 injection channels, so perfect for a 2 rotor.
Stock crank angle sensor can be used, as it's got 2 VR inputs, which work well and don't use the annoying adjusting pots.
There is just one extra freely programmable output though (PA0), I usually use that for the cooling fans, but if you use a thermo-switch for the fans you can use this output for the 6-port valve solenoid.
Or you can ditch the idle valve and use that output.

If you want more I/O then I would go with an MS3 with an MS3X board, which is what I'm currently using on my own car.
An alternative to this is to use an external input/output board and connect it via can, like this one: https://www.turbocorse.at/can-bus/i-o-board/
That will add 8 EGT inputs, 4 analog inputs, 4 free outputs, and a few frequency inputs so should be plenty. Can be used with an MS3 aswell.

 

Good to see ur still around

Why the MS3X though, seeing as how the MS3Pro series with their EVO/Ultimate versions have grown into pretty much their own product. Cost-efficiency?

 

I just started up on Microsquirt for the first time yesterday on my Tii. It's 100% capable of running the stock FC coils with sequential trailing spark and a split table.I am also doing boost control, PWM IAC, and using a digital output to actuate the twin scroll valve. Since you're NA, you will have 2 of those outputs freed up, and you can certainly use on to actuate your 6p solenoid.

So far the only major hangup I'm having is CAS signal troubles, but that's par for the course, and you've already solved that problem with the FFE.

I'm not sure why some are saying the MS2 is more economical, the uS is substantially less money. It is definitely limited on IO, but it's totally capable of running the 13b with a few extra digitals and analogs to spare.