Really? So there is nothing that meters airflow, like a mass air sensor, or a "barn door" or anything like that?
As an aside, the BMW car people refer to this configuration as "alpha-N," don't know how widespread the term is. All I know is, it's my very favorite way to meter air and fuel. Of all the FI vehicles I've ever driven, the two best-behaved ones (no funny glitchy behavior) were my old BMW 2002tii (mechanical alpha-N system) and my M750.
Speeddog, how sure of that are you? The story I always heard was that using the throttle-position technique ("alpha-N," whatever) was great for driveability and power, but not so fantastic for emissions, since that setup didn't let you run quite as lean as with a MAF. However, I've been out of the loop (Loop! Oxygen sensor! Ha! I kill me) for quite a while on the new stuff; they may have gotten it figured out.AFAIK, most new cars are like our Ducs, throttle position and RPM are the main signals. Much cheaper per car (or bike) to not have a Mass Air Flow sensor.