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by vish4
2735 days ago
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This is not limited to Porsche. Most cars with 6+ gears hit top speed in 6th, as this gear applies enough force at wheels to reach top speed. Some cars do it in 5th or 4th as well. This happens because force needed to reach high speeds is follows the square power law. Higher gears simply can't provide the force needed to counter air resistance. The higher gears, like 7th or 8th, are designed for fuel efficiency. They are known as cruising or overdrive gears, because in those gears, the output shaft is rotating faster than the engine. Good info on this: https://en.wikipedia.org/wiki/Overdrive_(mechanics) |
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