Control & Operation第 64 / 120 题
How do you know when to shift using engine speed?
a.Shift whenever the vehicle feels slow
b.Shift at the same road speed in every gear
c.Shift only when the engine stalls
d.Learn the operating rpm range for your engine and shift up when the tachometer reaches the top of that range
解析
Each engine has a recommended rpm operating range, and the tachometer tells you when the engine has reached the point to shift. Guessing by feel, using a fixed road speed for all gears, or waiting for a stall wastes fuel and can over-rev or lug the engine.
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