The simplest manner to consider overdrive is to affiliate the phrase “overdrive” with the phrase “actual massive gear.”
As soon as you identify that psychological image, any confusion goes away. Overdrive means you might be utilizing the most important gear in your transmission to show the wheels, at excessive pace. As a result of a giant gear has extra steel enamel on it than a smaller gear, the massive gear has to show much less (fewer RPM’s) to keep up the identical pace as a smaller gear.
So, while you’re driving at the next pace, it will stand to purpose that you’re going to get higher gasoline financial system since you are being powered by an even bigger gear that’s spinning much less. Overdrive lowers the engine’s RPM’s, and that saves fuel and put on on the engine. Overdrive is finest for lengthy, flat stretches of freeway. I at all times kick into overdrive after I know the highway forward just isn’t hilly and I can drive uninterrupted at excessive freeway pace, and I am not towing or carrying an additional heavy load.
You can too merely depart the overdrive swap “on” and this may occur robotically. I like to recommend overdrive for speeds of 60 MPH or greater. When do you have to NOT use it? By no means use overdrive if you end up driving in hilly areas, towing one thing, or travelling very sluggish. You would really injury your transmission if you happen to do. Bear in mind, a giant gear has to show much less to keep up the identical pace as a smaller gear. So, at greater speeds the massive gear is doing its job, pushing you effortlessly alongside an extended flat freeway at a gentle excessive price of pace, and saving you fuel whereas doing it.
However while you’re travelling at slower speeds or stopping and beginning or going up and down hills or towing a automobile, it is much less about point-and-shoot excessive pace journey and it is extra about having fast energy to speed up, or having the ability to navigate by means of hills or mountains, or having the ability to safely tow a heavy load. At a decrease pace, the massive gear would flip much less and fewer and lose its effectivity over the smaller gear.
You’ll then must shift right into a decrease gear to generate sufficient RPM’s to offer energy to the wheels. In the event you did not shift right into a decrease gear, you’d shortly really feel the larger gear struggling to energy the wheels and the RV would vibrate and lurch. It is best to by no means use overdrive if you end up driving beneath these extra nerve-racking circumstances. I depart overdrive off and manually flip the swap to “on” after I journey on lengthy stretches of flat freeway.
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