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engine braking . . . how bad is it?
I was reading this article about a BMW N20 engine when this popped up:
BMW's N20 engine--four cylinders, more power - AutoWeek Magazine
Quote:
. . . although like most modern direct-injection units, there's a distinct lack of engine braking on a trailing throttle. The engine's powerful electronics package ensures maximum coasting potential is achieved by allowing the revs to fall away gradually.
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A car descending a known grade at a constant speed checked by engine braking will dissipate energy per the change of kinetic energy. Having done this experiment in past in a manual transmission Camry, not instrumented but ordinary driving, I have memories of this technique being quite effective. But this also gives a clue about throttle plate losses or as a brake, effectiveness.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
Last edited by bwilson4web; 02-20-2011 at 09:26 AM..
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