Quote:
Originally Posted by kawasaki00
If the engine is turning it has combustion, some racing engines will kill all fuel on decel but the s65 does not do this. I have never heard of a production engine that does it. It makes transient throttle response abrupt and it is hard to tune out.
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When Bosch introduced Motronic in the early 1980s, full fuel cutoff on a closed throttle was introduced. To the best of my knowledge, all BMWs since that time have had zero fuel flow under closed throttle until around 1200-1400rpms (depends on the engine, but it resumes to prevent stalling). Similarly other makes behave in the same fashion. It's relatively easy to observe in action. I'm not aware of BMW changing things with the S65 in this regard...don't think it flows any fuel on a closed throttle as long as revs are above ~1200ish.