MicroSquirt.com read only forum (Jan.15,2018)

Has anyone been Beta testing Microsquirt on a british car, i.e. mini, MGB, Morris, etc.?

Most of the effort with the A series and B series motors is being done on MS2 at the moment, with some code that will allow staged injection to overcome the worst of the problems inherent with a siamesed port engine. For single point injection (which doesn't suffer these problems) you could use uS out the box. Once the siamesed code is stable I have no doubt it will be ported to the uS.

Actually Bill, I have serious doubts the code will be ported to the uS. Since the siamese code is based on the MS2/extra code and the uS has significant differences in the way the ignition and tach triggers work, this would not be a trivial task. Moreover, I don't have a uS and I doubt anyone else would do the porting if I can rely on my past experience.

Jean

p.s. I'm using this username because I can no longer use my usual username on this forum and the admin doesn't answer my emails.

I am waiting with baited breath (as many others are) for the uS to be readily available. I have modified my twin SU carbs to accept a TBI type of injection system.

I also want to make sure that I have Spark control. MSII should work for what I want, but the small package of the uS is ideal for packaging inside my Mini.

I came to know of MS reading Grassroots MS. I was ready to do the MSII, until I found out about uS.

When you talked about the staged injection, was that comment based on a multipoint injections system?

Jean,

The uS is not *that* different, I don't think it would be overly difficult to use MS2/Extra code on one. The low-z injector capability is gone (unless series resistors are used), and the second tach input may be different, but the LED outputs for ignition are available at the connector. I've had MS2/Extra (not the very latest version) running on what is effectively a uS, on the bench, no issues. Maybe some simple mods for I/O would be required at most (much the same scenario as if you use MS2/Extra on any PCB with the MS2 daughterboard).

Ian.

Back to my old self (using my original username)

Ian,

The difference are not that big but involve playing around with inputs and outputs on different pins and using the timers differently. If you chose carefully the options you use you may be able to get away using MS2/extra on the uS but you are limited. Also, as code evolves the differences are getting more important.

I'm not saying it's impossible but I doubt you'll be able to take the code and have it work without modifications. And if I look at the people who have helped me with the bench testing (up to now no one on the new code), I don't see anyone making the modifications necessary to make the code work on uS. And I'm not the one who's going to be supporting this because it's going to be enough to do it on MS2 (and as i said I don't have, nor will have, a uS). And as the code evolves there are going to be more limitations due to the uS hardware which can't be modified (at least not easily). I don't want to bash uS. It's great for what it does but the expandability is not the same as MS2.

Jean

Well one day I will get my bench up and running. At least I have the bench in place now...

Yes, I agree Jean, I was just making the point that the uS will run MS/Extra code without having fits. But in the true spirit of DIY MS, I'm sure many will be modified. The only uS I've seen has already been modified to accept an EGT input, so I guess that's a sign of what's coming up. The only major change I can think of with the uS is that PWM has been disabled which frees up 2 I/O ports, which I doubt straight MS2 or MS2/Extra will ever use. So the rest of it is basically the same.

Ian.