Matt Cramer

Red is key-on power. The MS trigger goes to the Tach terminal on the relay board. You can run the 1K resistor between Switched 12V and the Tach terminal. And you can ground the black most anywhere - I'd ground it to a spot next to the relay board ground.

Dave, I saw a few bits of tach noise in the data log, but most of what I saw looked like it could be cured with some careful tuning of the acceleration enrichments. You've got a good clean TPS signal, so you might want to blend in some TPSDot. I saw the lean spikes, too - it's hard to tell if they are from too little acceleration enrichment, or so much that it caused a misfire.

If the problem's not happening with MAP based AE, I'd stick to that. If it is, could you please post a data log and MSQ?

This is a bug in MegaTune. A bit annoying, but of no real consequence.

Sorry if things were a bit ambiguous - our standard 280ZX installation is supposed to give it a 12 volt signal, but it also works with 5 volts. But it must get a clear signal of some sort to run.

You can use MSnS-E for fuel only useage too. But if you want to make a lot of the extra tuning options disappear and go to 8x8 tables, you can reload it with standard MS-I firmware. Here's the code file: http://www.bgsoflex.com/v2.98/megasquirt.s19 It's easiest to load with the MS-II downloader program, which works for MS-I too: http://www.not2fast.com/megasquirt/ms2dl/ms2dl104_setup.exe

If the DIS module didn't come with a 36-1 crank wheel, yes. Ford's 3.8 Super Coupe and Taurus SHO used a weird TFI / EDIS hybrid that was simply marked "Motorcraft DIS." It appears to use the same signals as a TFI system instead of an EDIS one, and IIRC it has a cam sync sensor of some sort as well as a 3 tooth crank wheel. So it's not as easy to swap on as EDIS.

"Minimum for HEI" is a setting meant for 7 or 8 pin HEI modules, not 4 pin modules.

Well, I've got a bit of bad news... if the '96 Thunderbird has its original electronics, the EDIS module will be integrated into the ECU. Boost Engineering sells used EDIS modules if you want to buy one online. They also pop up on eBay pretty regularly.

Some of those Porsches have a ludicrously high number of teeth on the crank trigger, 135 teeth IIRC. It overloads MS-I. MS-II I'm not so sure about. Bosch decided to count the number of teeth on the flywheel to get as much resolution as possible. They later dropped this in favor of a 60-2 wheel.

The easiest way to check if the box works is to use a Stimulator, if you have one. It sounds like you may have a configuration issue with MegaTune; if you configure it wrong you will not get communications. Let's see if something else will communicate with it. The MS-II code download utility is my favorite tool for this as it's pretty easy to get a response out of a working Megasquirt. First, download and install the MS-II code download utility, if you do not already have it. The link to download that is here: http://www.not2fast.com/megasquirt/ms2dl/ms2dl104_setup.exe Power up the Megasquirt and connect it to your PC. You do not need to open the case and should not put the boot jumper in place for this test. Close MegaTune if it's running, and run the downloader. Set the appropriate COM port and 115200 for the communication speed. Then go to the File menu and select Read Signature. When you do this, the downloader program will tell you what code version you have in your Megasquirt. What response do you get?

Where was the timing with it at 90? I'd try starting at 110 if it'll take that.

Remember, a trigger angle of -10 is the same as a trigger angle of +110 on this car. Might want to experiment with large number trigger angles.

The wrong edge generally causes the timing to move around with RPM, and may make for a bad trigger angle. You should be able to get the engine to run with the wrong input capture, but your timing will be off.

+1 on the Lokar. I'm running it on my Dart.

There's a couple of programs for logging with a Palm and tuning with one - you'd have to download the log to your PC and run MegaLogViewer on the PC, however.

Thanks for sharing all of this, Moby! This is the first time I've seen a detailed write-up on how to Megasquirt an LS1.

Could you post a data log of it attempting to start?

Actually, most injectors don't have any polarity at all and will work either way.

And Chrysler didn't, as near as I can tell, redesign their combustion chambers for this on most of their engines. Some of their Lean Burn engines ran 1960s vintage open wedge heads. BTW, my slant six Megasquirt project is using a hybrid of Chrysler Lean Burn and GM HEI parts.

Both the injectors and the 36-1 wheel will work. We're working on a solution that doesn't involve pullers.

There's three main boards currently on the market (not counting the eMS-Pro) and two processors. The V2.2 is sort of the base model. It's designed for fuel only control with high impedance injectors, but can be expanded to work with other things. The V3.0 adds some ignition control features, including the ability to read variable reluctor sensors and a lot more overcurrent protection. The V3.57 only comes in assembled form. It's basically a surface mount V3.0, although it has an extra connector that is handy for six coil ignition systems. The Megasquirt-I processor is an older design, with more documentation and testing for extra I/O functions. The Megasquirt-II has a faster processor, but the distributorless ignition options aren't as well tested. Right now, only the MS-I can drive six coils independantly. To meet your desire for COP ignition, a Megasquirt-I with a V3.0 board (if you're building it yourself) or V3.57 (if you're buying one ready made) would be best. You'll need some sort of trigger wheel setup, as the stock trigger wheel doesn't work for wasted spark. There's a couple options: 1. Use a crank trigger and fill in all but one hole on a ZXT optical distributor. 2. Machine a custom plate for the ZXT optical distributor that will let you use the Megasquirt's missing tooth wheel. Something like a 12-1 or 36-1 wheel will work. Any amount your injectors can work with. Almost anything with the V3.0 and higher boards, but there are a few limits. Just don't grab them off something truly weird, like a Bosch CIS K-Jetronic or a common rail diesel, and you should be all right. Megasquirt-I can do this with a suitable trigger. Megasquirt-II is limited to four coil outputs, so you would need wasted spark. Again, as long as it's not something too weird, yes. You'll need to figure out its dwell settings.

It was pretty easy to miss - the documentation is something of a work in progress at the moment.

For those who missed it on the MS2/Extra forum, the percent is actually a percentage of normal atmospheric pressure, 100 kPa. So the percent is the same as the kPa value, not a percentage of the MAP sensor's readings.

This is unique to MS2/Extra and reflects some internal changes in the way it calculates loads. I don't believe there is a way to change this.