I am going to break down and learn the fuel injection systems so I can install one on the race car.



The Megasquirt kit looks to be the cheapest. The Kinsler mechanical constant flow looks to be the easy one to learn. No electricity. Works like the Continental airplane dribble injection.



Has anyone built and run the Megasquirt kit. Any comments on programming or performance?



It would be mostly WOT between 8,000 and 9,800 RPM. Idle and RPM below 8,000 wouldn't matter much.



Any suggestions for a cheap system?



Thank you.



Lynn E. Hanover

 

I started one, but have not finished it yet. You NEED

 

err... supid enter key.... Here's what I ment to say



I started one, but have not finished it yet. You NEED to have a very good sodering pencil, and be careful. I blew my LM2937ET (it's a voltage regulator) when I started using a crappy radioshack sodering pencil. I went on ebay and got a pace sodering pencil. It works great.



You are gonna wanna start with the simulator, it's the hardest to mess up.



There are lots of people (like 10) currently using them in 1st gen's, I have an 86 that I am going to try it with. I got the hud too, I put it together, and it works so far, and looks cool too. I also opted for the extra box under the hood, so my re-wiring is easier.

 

Lynn,



I drop by these forums now and again, and noticed your post. I find your posts a 'must-read', and really appreciate you taking the time to share your experiences.



I've been running MS on my 13B for a couple years now, and am pleased with the system. I can see no issues with the specs you've provided, although the rpm range is above what I've explored. Some guys with bike engines are running the MS up over 12k, so your rpm range should be no problem. There is some info on a rotary-specific page here:



http://www.megasquirt.info/manual/rotary.htm



The rest of that site is great as well. I doubt you'd find better documentation anywhere. If you proceed with the project, drop by msefi.com, which is the main support forum. The signal-to-noise ratio is pretty high there, with lots of neat new developments in the works.



Cheers,

Roger.

 

Well, thank you for that.



I just read that and it is not all that hard to understand.



Now if I can just movethis whole mess to a new house 30 miles away, sell this one, get the car patched up from last year, and get ready for 05, I can build me a Megasquirt and give it a try. TWM has some killer looking short horns in carbon fibre that I would love to try.





Lynn E. Hanover

 

Lynn, Adam (mazdaspeed7) runs one.

 

ColinRX7 built one too.

 

Ive been very happy with mine. There is one drivability glitch Ive noticed in day to day driving that I cant get around, other than adjusting my driving style. There is a light bucking below 2500 rpm on decel. In the higher rpm ranges, I had the decel range tuned much leaner than the rest of the map to keep it smooth on decel. But as the engine gets closer to idle, the map values go up to the idle values, at which point my car had to be tuned rich to run smoothly. So the transition from lean decel to rich idle caused a light bucking.



Other than that, Ive had perfect reliability, and its very easy to tune. I had a base map from Roger Enns up and running on my ported engine in 30 minutes, and tuned to a drivable state in another 30. That was with no prior experience tuning. I spent a lot of time tuning for drivability, and especially the warm-up enrichment.



My car saw 9500-9700 rpm on a regular basis with the MS installed, and never once had a problem.



My current project is 2 MS boards run in parallel. Sequential injection on the primaries on the first board, and secondaries and mapped water injection on the second board(using dual table code), and each controlling a ford EDIS box for full ignition control. And a wideband O2 thrown in for fun.

 

that light bucking is hard to tune out without a decel fuel cut, even with the "real" ems systems

 

I know. I think its almost something that needs to be designed into the EMS to deal with it.



Even the decel fuel cut wasnt helping on the MS, b/c its time based. And on top of that, any tuning that would make the car smoother in that low rpm range would cause a big stumble on WOT shifts.