Why a shorter rear gear will accelerate the car quicker
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You know that a shorter gear will provide more acceleration than a taller gear, but at the expense of lower top speed with the shorter gear. But how does it do it? | You know that a shorter gear will provide more acceleration than a taller gear, but at the expense of lower top speed with the shorter gear. But how does it do it? | ||
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In addition to more power pulses, the numerically lower gear will multiply the torque in a direct ratio to the the amount of gear change. Take an engine that produces 400 ft/lbs torque with no gear reduction. With a 3.00 rear gear ratio, it will out put 3 times the torque at the wheel. If the same 400 ft/lb engine has 4.00 gears behind it, the torque will increase 4 times producing 1600 ft/lbs of torque. The downside is the reduction in wheel speed, now at 75% the original speed for the same engine rpm's. EXAMPLE: A motor turning 5,000 rpm's with a 3.00 gear and 88" circumference tire has a terminal speed of 138.88 mph. A motor turning 5,000 rpm's with a 4.00 gear and 88" circumference tire has a terminal speed of 104.16 mph, a reduction in terminal speed of 25%. | In addition to more power pulses, the numerically lower gear will multiply the torque in a direct ratio to the the amount of gear change. Take an engine that produces 400 ft/lbs torque with no gear reduction. With a 3.00 rear gear ratio, it will out put 3 times the torque at the wheel. If the same 400 ft/lb engine has 4.00 gears behind it, the torque will increase 4 times producing 1600 ft/lbs of torque. The downside is the reduction in wheel speed, now at 75% the original speed for the same engine rpm's. EXAMPLE: A motor turning 5,000 rpm's with a 3.00 gear and 88" circumference tire has a terminal speed of 138.88 mph. A motor turning 5,000 rpm's with a 4.00 gear and 88" circumference tire has a terminal speed of 104.16 mph, a reduction in terminal speed of 25%. | ||
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