[eschaider]

MegaSquirt runs off electricity and so does MicroTech. I think you mean to say Microtech uses a Speed Density fueling model. Megasquirt uses Speed Density, Alpha-N and Mass Air Flow. Of the three Mass Air Flow is the most capable, followed by the Speed Density model. In terms of popularity the Speed Density is the most popular aftermarket fueling model.

Megasquirt can use all Ford sensors, GM sensors or just about any sensor that has calibration data available for it. The MicroTech ECU uses a variety of differently sourced sensors frequently w/o any published calibration data aong with a MicroTech proprietary wiring harness connector that will not match up to an OEM Ford ECU.

The MS3Pro PnP ECU uses the OEM Ford wiring harness connector. That allows it to literally "plug" right in to the OEM Ford Wiring harness. There area number of benefits for you to this approach. OEM harnesses are extremely well built and will last 20, 30 or more years. They are very tough, well constructed and where necessary shielded from electrical noise. Best of all they use standard Ford over the counter (at your local parts store) Ford sensors so you don't get sucked into having to buy overpriced (2x multiplier or higher sometimes) EFI manufacturer branded sensors.

They are also available for pennies on the dollar from salvage yards.

The use of the OEM wiring harness is about durability, connectability and fairly priced over the counter (at your local parts store) OEM Ford sensors. It is also about not having to build your own custom harness — which is a PITA.


Ed