Published at Tuesday, 14 April 2020. manual car. By Suzette Dubois.
So why would we include a Jeep among st all this high-performance metal? Well first because the Wrangler is all new for 2018. And second because a manual transmission adds an extra dimension of fun to 4X4s. Creeping up and over boulders with a manual transmission is challenging and requires just the right shift timing, throttle, and clutch work. An automatic lets the vehicle slowly crawl over the worst trail obstacles. All the driver has to do is steer and gently apply the throttle.
Ideally, the transmission would be so flexible in its ratios that the engine could always run at its single, best-performance rpm value. That is the idea behind the continuously variable transmission (CVT).
Cars need transmissions because of the physics of the gasoline engine. First, any engine has a redline — a maximum rpm value above which the engine cannot go without exploding. Second, if you have read How Horsepower Works, then you know that engines have narrow rpm ranges where horsepower and torque are at their maximum. For example, an engine might produce its maximum horsepower at 5,500 rpm. The transmission allows the gear ratio between the engine and the drive wheels to change as the car speeds up and slows down. You shift gears so the engine can stay below the redline and near the rpm band of its best performance.
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