I took a course in college that dealt with the Motorola 68HC11, which was developed primarily for fuel injection usages. Edelbrock uses it in some of their applications. I've been toying with the idea of building a small fuel injection system for a 2 stroke motor just to get exprienced with the whole process. Before I go off into never-never land, I was just wondering if anybody has done this and could point me in the right direction in terms of what sort of stuff I need to include in the software.

 

GM does. :P

You might want to have a look at the DIY EFI mailing list archives. I was thinking of doing something like this for my 4th year engineering project, and there is lots of good info in there.

Maybe use something like the handy board from MIT:

http://el.www.media.mit.edu/groups/e...s/handy-board/

 

I played around with a HC11 for a V8 on a boat. I used the microcontroller with 512 bytes of EPROM. That is not very much room when trying to control an engine.

I used a MAF sensor solely, no RPM, no TPS. After I linearized the MAF sensor's output, the boat ran ok, but tuning at best was crude.

At least for me, I believe that it would be easier and cheaper to pickup and learn an existing system. You can spend A LOT of time just playing with your software, let alone the tune of the engine.

If you do give it a shot, get the HC11 that has 4k (or 8k, I forget) of EPROM. To get an engine to run good with DIY-EFI, you need TPS, ATS, CTS, RPM, and MAF or MAP.

 

For the C3 and P4 GM ecms that what they're using (thou it's a GM spec chip).

Get a goo complete Hac of any GM ecm and read thru it.

Might visit DIY-EFI and look around the 332 area, and run a search on Megasquirt.