Megasquirt EFI and Ignition Project

[Shappers]

I thought that Stan used MS&E because the MS1 didn't support ignition without MS&E

You're right

I forgot that the original MS1 doesn't have the ignition code. I went with it originally to get the 12x12 tables and only later decided to add ignition to my MS1 v2.2 board. Stan used the MS1 v3.0 board which already had the ignition hardware, then used MS&E to get the ignition code (and 12x12)!

Just read that your MS2 board has all that goodness built in and ready to go

Just wanted to clear it up for people following along later.

[81xsproject]

Mounting the VR sensor was one of the LONGEST ordeals. I spent ton of time looking for the 90 deg VR sensor. A 36 tooth wheel is going to be interesting. I wonder how many teeth one of the camshaft gears has...? I have seen on the MS forum where folks have used chain sprockets for their ford EDIS wheels. I thought that Stan used MS&E because the MS1 didn't support ignition without MS&E, but that Microsquirt was based on the MS2 chip which does.

[Shappers]

It's true that the MSnS-Extra software has lots of extra bells and whistles that we would never use, but the main reason that people use it (me and Stan included), is that it gives you those nice 12 x 12 fuel tables.

I've been scratching my head wondering how to mount my Ford VR sensor to the engine (I'm using a 36-1 toothed wheel). Your solution is perfect, I never thought of using the old vacuum pipe hole as a place I could put a bolt through! Good work.

[81xsproject]

Shapp's, I thought MicroSquirt was MSII...? I am running the standard B&G soft/firmware. The only incentive, that I know of, for me to run the MS&E, is that if provides an option for Launch Control. All it is, is a clutch switch actuated lower rpm limiter. I don't know if I will ever actually go to the drag strip, but after having it on the MSD I was running for a while, I wouldn't mind having it again. Once things are all worked out, maybe I will give it a try.

Korr, thanks man. It has been such a cool project. Waiting on the damn throttle cable is killing me. At least the weather here sucks right now.

[Korr]

That is amazing work! I think my brain just turned to mush...oozing out of my nose.....

[Shappers]

Great work

Are you running with the MegasquirtnSpark-extra software? It would be good if you were as then we could compare fuel tables.

I'm not convinced that I want to drill my nice new chrome headers for a lambda bung so I may try and tune mine without an O2 sensor!

Can't wait to see yours running!

[81xsproject]

My wheel was a half inch smaller than this one, but I used the same notch dimensions.

[xschop]

Do you have the reluctor diagram/dimensions?
I am machining a VSS wheel for my other project and have the equipment setup to make degreed notches. I may do FI to the big bore later on......
That sensor looks like the stock GM VSS sensor that I have too.

[81xsproject]

I called up Motion Pro today to order my $30 custom throttle cable. I ended up ordering a GSXR cable extended 23". Because the cable comes up to the throttle bodies from underneath, I had a 90 deg elbow put on the end. It will run from the outside of the #4 throttle body and up between 2 and 3. Problem is that because it's spring, the cable guys are backed up and have a 12-15 day turn around.

[81xsproject]

webbcraft2150

Hey, your missing the side cover grommet on the left side.

Oh, but you are wrong, sir. The grommet is IN the cover.

[webbcraft2150]

Hey, your missing the side cover grommet on the left side.

[petejw]

Thats just awesome. :-)
looking forward to seeing how it all turns out.

[81xsproject]

HEREis a link to the MegaManual section on the GM DIS. Probably a better explanation than I can regurge.

[Ivan]

Hmm, most low resolution EI setups I have seen (all factory from cars) have the same number of pulses as the number of cylinders. High res ones use more like 50 pulses to sense fluctuations in crank speed and that is how OBDII senses misfires and which cylinder it is.

I think your FI setup is really tricked out. I am looking forward to seeing how it goes for you. Ultimate tinkering entertainment!

[81xsproject]

Because the ICM reads the notches to get RPM/crank speed. The double notch is the 'sync pulse.' So, the ICM uses the crank speed and different methods (selectable by the user) to 'calculate' when it fires.