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Old 11-22-2010, 09:11 AM   #49
Dog Rancher
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Joined: Feb 2003
Location: Atlanta, GA
Oddometer: 4,567
Originally Posted by Poolside

You bet. Not so pie-in-the-sky as you might think. You can get virtually the whole way there with external mods.

That 16 year old Motronic was born in the 80's. The version in the 1100/1150 is called a Mono Motronic It was designed for throttle body (single injection point) fuel injection systems. It was re-labeled simply Motronic as the OE product for the BMW boxer motor.

Because of the 180 opposed cylinder arrangement on the boxer motor, the Mono Motronic ECU can be operated as if it's controlling a single cylinder motor running at twice the RPM.

The primary problem with the Mono Jetronic is that BMW used it to control 2 injectors with a single injector signal. The method is commonly referred to as batch injection. It is sort of like wasted spark ignition, only for fuel.

That's ok for spark control, but it leaves a lot to be desired from a fuel control point of view.

Poolside so this explains what is wrong with the present system. Can you explain what a perfect or ideal system would do.

Say you had no limitations what would you build to make a perfect control unit? Would you have more sensors to make more accurate calculations and more accurate fuel delivery in conjunction with timing changes?

Would it disregard pollution standards and go for performance only?

Does another mfgr do it better already?

Does the boxer do the wasted spark method on the ignition? I had a Pontiac V6 that did the wasted spark. I think they said it sparked the coil of the charged (firing) cylinder and the opposing cylinder at the same time and more spark went to the charged cylinder because it had less resistance.

This is interesting!
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