What is a Shift Light?

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Shift Light:

The shift light is a warning lamp fitted to vehicles to point to the motive force that maximum RPM has almost been reached. Ideally, a shift lamp will illuminate at the engine speed beyond that which delivers the utmost BHP specified the BHP before and after shifting is that the same. Accelerating the engine beyond this time isn’t conducive to rapid acceleration. In use a shift light allows the motive force to evaluate the precise point that a gear change should be allotted without having to glance down at the tachometer. This also increases safety for the driving force by keeping his concentrate on track the least times.

Beginning within the early 1980s, many market vehicles equipped with a manual transmission began to own shift lights as standard equipment; these would usually signal for an upshift at an engine speed that provided maximum fuel efficiency, below the best engine speed for optimum BHP. the explanation for this was, for a time EPA fuel economy testing rules stipulated that shift lights would be followed on vehicles so equipped- thus, they were calibrated for optimum fuel mileage on the EPA test cycle. Some within the 1980s even had buzzers to alert the motive force it had been at a particular rpm.

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