Hello everyone, and welcome! Today I am gonna tell you about five thing you should never do in an automatic transmission vehicle. As many peaples aren't aware of these or carry on their habits of driving manual transmission. But it will eventually hurt your ride and put a huge hole into your pocket.
1. So the first thing is that you should never put your vehicle in neutral when you're coasting down a hill. And so the logic behind this may be that, you know, you can save fuel economy by putting it in neutral and coasting down a hill. And let's say you're on a tall hill, and about to go on a shorter hill, If you put it in neutral, you can gain a lot of speed and gain enough speed to go over that smaller hill without, you know, getting on the gas and so you can save some fuel by doing that. But the other thing is, when you do have it in gear and you're coasting down a hill modern transmissions and modern vechicles, what they'll do is that they'll cut fuel to the engine. So you'll just use the wheels, which are connected to the transmission, and thus the engine. Because it's in gear, to shut off the fuel injectors so that the wheels will be powering the engine. And so in that case you won't be using any fuel. So as you're going down that hill you won't be using any fuel. And you can see this on fuel economy indicators If you put it on neutral, it'll read something a little bit lower and then if you put it in drive, then you can notice the instantanious fuel economy will go up to the highest number that it can read. Because it has shut off fuel from going in to the engine. Now the other reason you don't want to do this, and there is really three reasons. Is that it kind of takes a bit of control out of your vehicle. So when you're in neutral, you only have the ability to slow your vehicle down. You no longer have the ability to speed up, because you're not in gear. So you're taking out part of your control from it. And the third reason, if those aren't good enough for you to not put it in neutral when you're coasting down hill. 'Do not put it in neutral', because you are taking yourself out of control of the vehicle.
2.Moving on to number two, whenever you're changing directions in an automatic transmission vehicle, you wanna make sure to come to a stop before switching from drive to reverse, or from reverse to drive. So backing up, come to a stop, then put it in drive, and then move along. And so the reason why you want to do this is because, you're using your brakes to stop the vehicle rather than your transmission. Your transmission is designed to shift gears, your brakes on the other hand are designed to stop the vehicle. So this is an automatic transmission band, and what this does is is it clamps down around the housing of a planetary gear set. And when you do that, you alter the gearing of the planetary gear. So when you're in reverse or drive this might be open, and then when you put it another one it'll clamp down on a drum. So this works a lot like a the reverse of a drum brake. So instead of pressing out like a drum brake, this squeezes down on a drum. And so, what you're doing when you change that direction is you'll be using these bands, as well as clutches. Automatic transmissions also have multi-plate clutches within them And so when you switch gears, these bands will clamp down to change the gearing And when it does that, you're using this material here on this automatic transmission band to stop your car, rather than the brakes, which are easy to service and cheap to replace.So come to a stop, then put it in what gear you in to go in.
3.Number three we're going to talk about launching your car. Now obviously, if you want your car to last as long as possible, and you want the maximum longevity out of your transmission, then you should never launch the vehicle. It is going to put a lot of strain and stress on it. But there's different methods I've seen people use, and some of them are kind of, you know are kind of dangerous and you should never do them. So one of the methods I've seen that people have done is they'll rev it up in neutral and then they'll drop it into drive and then let that carry their car forward. And so that's kind of a dangerous way of launching your vehicle.... and we're going to get into why using some parts. So this will be splined with the transmission as the impeller rotates, it will force this turbine to rotate, and as the turbine rotates, it will rotate the transmission, and thus the wheels. So your engine can be rotating and your transmission can stay stationary. When you launch and you rev it up in neutral, and then you put it into drive what you're doing is you're going to be having friction between this, this band... and the drum which it's resting around, as that tries to clamp down to send power through it. And so, you're going to have clutches and bands within your automatic transmission that are going to try to be absorbing that power, but you're going to have slip, because you're sending so much power through it, and these are designed to shift gears, not to handle a launch.
4.Moving on to number four... there's no reason to put your car in neutral when you're sitting at a stop light. It's fine to leave it in drive, and that's something some people will commonly do is to take it out of drive. For several reasons they may think, okay, it's putting a lot of stress on your transmission. But, let's think about that for a moment. If you're sitting there with it in drive, so your engine is spinning, and my hand, which is touching the turbine, obviously isn't moving. So your engine is spinning, [the turbine] isn't, so you're putting some stress on the transmission. And yes, that's absolutely true, you are doing that, but let's think about it. Once you let off the brake and you start accelerating, you're putting a far greater force into that turbine to move your vehicle forward than if you're just sitting there with your engine idling and it's trying to put some of that energy into the turbine. So really, you're not putting any additional stress on it, it's far less than you are when you're actually accelerating, so it's kind of crazy to think, "Oh, I shouldn't do that." The second thing some people will say, it can save fuel economy. And when you are in drive, obviously you're going to be putting some of that energy into trying to rotate this, and you're rotating against an object which is stationary, whereas if you put it in neutral, it can spin much easier because you're disconnecting from the transmission. Well, the thing is there, you will tend to idle higher in neutral verses being in drive, but regardless it's not going to be a big fuel economy difference. Just leave it in drive while you're sitting there at the stop light, and you're not putting any additional wear, and you're not really going to be saving any fuel.
5.Moving on to number five, you should never put your vehicle into park until you've come to a complete stop. So, you should never put it into park while the vehicle is moving. Now, here's the thing. Most automatic transmissions, especially modern ones, will not allow you to do this, but it's cool to understand why. When you put your vehicle in park, you're applying a pawl, essentially a locking pin, into a gear which is connected to your transmission's output shaft. Your driven wheels are connected to the transmission output shaft, so when this is locked, your wheels cannot move. Now, if you were to engage the parking pin while the vehicle is moving, and there weren't systems to prevent this from happening, you could very easily shear the locking pin and break it, as it attempts to completely lock up a transmission in motion. Either way, you'd be putting a huge amount of stress into your drivetrain and transmission. The first thing you should do is firmly press your brakes. Your brakes are always going to be able to out-power your engine. Now, you may use up that vacuum assist, and so because of that you may need to press really hard in order to get the brakes to successfully work, because once you run out of brake assist from the vacuum pump and you've got full throttle, you're going to lose that assist. And so, you want to make sure you press that firmly. It may not seem like it's working because you don't have brake assist. You've got to push really firm. The other thing you can do is downshift. So, as you downshift, you'll start to slow the vehicle down, and so that's another method of bringing your vehicle to a stop. So, thank you guys for watching.
If you have any questions or comments, feel free to leave those below.
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