JoeNova

Micro is basically the entry-level version of Megasquirt. Its based on the MS2 and is basically the bare minimum needed for a stand-alone. It uses the same software as all of the others, including MS3-Pro.

It uses batch firing and has far fewer input/outputs and is lackluster on additional features. It can still do quite a bit.

Here is a basic run-down. There isn't a lot of detail, but its a high-level overview.
https://www.diyautotune.com/support/...tems-compared/

TipsyMcStagger

iTrader: (1)

Can MegaSquirt handle things like cruise control and air conditioning?

Tipsy

JoeNova

Those are typically handled outside of the PCM in swaps.

TipsyMcStagger

iTrader: (1)

I had my E40 flashed from the GTO OS to the SSR OS, so it can utilize cruise.

Tipsy

JoeNova

You should be able to use one of the older cruise control boxes on a cable driven TB and it work fine.

You only need 2 signals from the ECU, and depending on which cruise box you use, one of them is irrelevant. The other is VSS signal. If you can send the same signal that goes to your speedo to the cruise control box, you should be able to use megasquirt and cruise control no problem at all.

JoeNova

I forgot to mention, if you find a cruise box that doesn't have a wire in the connector going to the H terminal, then it will work fine with microsquirt. The only signal it will need from there is the speedo signal.

JoeNova

And as far as A/C goes, you can use A/C no problem without the stock ECU. It is done in swaps all of the time.

TipsyMcStagger

iTrader: (1)

Good info. In my case, I'm using a DBW TB. I was under the impression that DBW TB's need native (PCM) control for cruise.

Insofar as A/C, I know it can be run independent of the ECU/PCM...but it's nice to have all of the features afforded by PCM control (WOT cutout, fan control, idle bump, etc). I know there are work-arounds, such as RPM window switches, etc. Just trying to get educated.

Thanks again for the good info.

Tipsy

gjestico

iTrader: (5)

Megasquirt no-can-do DBW. And it doesnt even dream of doing so. You will be needing to get a cable throttle body even without plans for cruise.

BLKMGK

Only standalone I've seen with cruise and DBW has been Proefi, any others aside from OEM doing it? Wish the 'squirt guys would do DBW at least as I've got an Sti swapped Subbie that needs it!

TipsyMcStagger

iTrader: (1)

That's more than I knew five minutes ago. Thanks for the continued education.

Tipsy

gjestico

iTrader: (5)

Holley Dominator does GM DBW, as well as elec trans control.

BLKMGK

No cruise though right? I think the Poefi is the only one that does it aftermarket, I know AEM doesn't. Motec might but $$

If cruise is really important as well as DBW the OEM becomes attractive honestly. Standalone allow for realtime programming too which I don't think any OEM will allow?

JoeNova

DBC Cruise control from a standard GM cruise control module works fine with microsquirt. No need to complicate it and try to get an aftermarket stand-alone to do it for you.

gjestico

iTrader: (5)

^^^As long as you remove the DBW throttle body and replace it with a cable unit.

Also, Be vewy vewy careful about attaching an actuator device to the throttle body.....Especially a non stock controlled device.....Think about what might happen if it yanked to WOT at an unexpected time......Make sure the brake interlock device is connected !

pantera_efi

iTrader: (1)

I was one of the inventors of the 60-2 (GM-58x) in 1984 used on the later GM LS engines AFTER the patent expired.
Thus I also have experience with the GM-24ex Crankshaft Indexing.
MY customers race in the BAJA, Dunes, and the Donut Shops.

What I have found whether my ECU, DIY ECU, or other EMS is fitted, you will need to "trim" the Spark Instant for "0" TDC.
This can be problem unless a TDC "0" mark is installed on the engine at time of assembly.
The average " trim" is +11 to +13 degrees, a large amount with a 24ex TW.

The chance to fit a 58x (60-2) TW is also possible when the engine is apart, a VERY good choice.

Lance

stevieturbo

Syvecs will do cruise control too, DBW, and pretty much anything you'd ever want. Obviously the more features you get, the more you'll pay though.

although if retaining DBW and an aftermarket ecu, it might be as handy to just install a retrofit cruise system. Would save using up any I/O's on the ecu as you'd need 2-3 to do cruise safely ( ie clutch switch, brake pedal switch and maybe some others so cruise would de-activate if either are touched. )