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TruckersReport.com Trucking Forum | #1 CDL Truck Driver Message Board
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Downshifting, how can I learn how to do it?
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<p>[QUOTE="Dino soar, post: 11712461, member: 208212"]I would suggest it's easiest if you can find a flat road and practice your shifting a bit there.</p><p><br /></p><p> I would also suggest watching your RPM gauge and really listening to the sound of the engine. On the flat road let's say that you shift at 1600 and the engine drops down to 1200. Now right away from there if you shift back into the gear you just came out of again watch your tach and listen to the sound of the engine. It should go back into the lower gear at about 1600. They are the exact same process only reversed.</p><p><br /></p><p>The flat route is good to practice on but it becomes a little more tricky when you are loaded and if you are going up hill or downhill.</p><p><br /></p><p> If you are loaded going up hill and the engine RPMs are coming down you have to shift at a little bit higher RPM. So in the example above you down shifted at 1200 rpms. I don't know what truck you're in or how the RPMs work on that but for the sake of the example let's say that if you down shift at 1200 rpm's that puts you at about 16 and that's where the power of the truck is. So 1200 would be the time to downshift- on a flat road.</p><p><br /></p><p> Now as you climb the hill the speed of the truck is slowing down. That's different than it was on the flat road. So if you're loaded heavily and the truck is beginning to slow down you have to down shift at a higher rpm. Because the object is to match the engine speed with the correct gear for the road speed because the truck is slowing down you need to start earlier at a higher rpm.</p><p><br /></p><p> So in this case let's say that you begin to downshift at 1400. This gives you more time to get the truck into gear.. If you are late when you try to downshift you'll never catch the next year you'll actually have to skip down to a lower gear and you really have to know where you are to find the right gear at that point. The faster the truck is slowing down the earlier you need to shift.</p><p><br /></p><p>So if you're climbing a hill and the truck is slowing down, downshift at a higher RPM.</p><p><br /></p><p>Now going downhill is the opposite. If you're going to slow down and down shift you should try to slow down to an even lower RPM because the truck is going to pick up speed. So if 1200 RPMs is where you normally downshift on flat road, going down the hill you should begin your downshift let's say at 1000 RPM.</p><p><br /></p><p> You have to know what your RPMs are and where the power is for your truck so the actual RPMs will vary according to what engine you have, but that's the idea.[/QUOTE]</p><p><br /></p>
[QUOTE="Dino soar, post: 11712461, member: 208212"]I would suggest it's easiest if you can find a flat road and practice your shifting a bit there. I would also suggest watching your RPM gauge and really listening to the sound of the engine. On the flat road let's say that you shift at 1600 and the engine drops down to 1200. Now right away from there if you shift back into the gear you just came out of again watch your tach and listen to the sound of the engine. It should go back into the lower gear at about 1600. They are the exact same process only reversed. The flat route is good to practice on but it becomes a little more tricky when you are loaded and if you are going up hill or downhill. If you are loaded going up hill and the engine RPMs are coming down you have to shift at a little bit higher RPM. So in the example above you down shifted at 1200 rpms. I don't know what truck you're in or how the RPMs work on that but for the sake of the example let's say that if you down shift at 1200 rpm's that puts you at about 16 and that's where the power of the truck is. So 1200 would be the time to downshift- on a flat road. Now as you climb the hill the speed of the truck is slowing down. That's different than it was on the flat road. So if you're loaded heavily and the truck is beginning to slow down you have to down shift at a higher rpm. Because the object is to match the engine speed with the correct gear for the road speed because the truck is slowing down you need to start earlier at a higher rpm. So in this case let's say that you begin to downshift at 1400. This gives you more time to get the truck into gear.. If you are late when you try to downshift you'll never catch the next year you'll actually have to skip down to a lower gear and you really have to know where you are to find the right gear at that point. The faster the truck is slowing down the earlier you need to shift. So if you're climbing a hill and the truck is slowing down, downshift at a higher RPM. Now going downhill is the opposite. If you're going to slow down and down shift you should try to slow down to an even lower RPM because the truck is going to pick up speed. So if 1200 RPMs is where you normally downshift on flat road, going down the hill you should begin your downshift let's say at 1000 RPM. You have to know what your RPMs are and where the power is for your truck so the actual RPMs will vary according to what engine you have, but that's the idea.[/QUOTE]
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TruckersReport.com Trucking Forum | #1 CDL Truck Driver Message Board
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Downshifting, how can I learn how to do it?
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