How Does Automatic Transmission Change Gears

As drivers, we know how the transmission works: we push the clutch in, change the gear and then continue driving normally. Manual transmission also teaches us how to perform clutch control without stalling or rolling on an incline. So how does an automatic car change gears?

There are more parts in this system that makes it a more complicated system. An automatic car has something called a torque converter. For the car to move forward, whether manual or automatic, torque is needed for the initial momentum.

The torque converter is a fluid link where its job is to connect the engine to the transmission and the transmission to the driven wheels (Front Wheel Drive or Rear Wheel Drive).

The engine is connected to the transmission in a bell housing. This is where the torque converter is. The transmission also contains something called planetary gear sets which provide different gear ratios.

The engine’s flex plate is also connected to this torque converter. So the torque converter basically takes the place of a clutch in an automatic car. When the crankshaft rotates it also rotates the converter. This is how the torque converter will disconnect and connect the engine’s power to the load being driven.

The torque converter has main components that make automatic transmission successful. These include:

  • The impeller – connected to the engine which is responsible for driving the turbine using viscous forces on the transmission fluid.
  • The turbine – connected to the transmission input shaft that sends the torque force to the transmission.
  • The stator – which sits between the impeller and the turbine. It lessens churning losses.
    The lock up clutch.

During the compression of the fluid it returns from the turbine that works against the impeller and its rotating movement that also acts on the engine.

The stator redirects the fluid so that the majority of the velocity gets driven towards the impeller which then adds to the torque produced by the motor. It can only rotate in one direction if the impeller and turbine are moving at the same speed. Stators do not apply torque when on a highway, only when coming to a stop or accelerating.

A planetary gear set consists of a sun gear and planet gears which rotate around the central sun gear, like our solar system. A planet carrier gear connects the planet gears with a ring gear that meshes them. The planetary gear set prevents certain components from moving when using clutches and brakes. This alters the input and the output of the system that changes the overall gear ratio.

Depending on which component is fixed it will determine the final gear ratio. If a ring gear is stationery or fixed, the ratio will be shorter than if the sun gear is fixed or stationery.

Brakes Noises Solutions

There will come a time whilst you are driving that you will have problems with your brakes. You might not notice it immediately but once you start to hear the noises, know that there is something wrong.

First thing’s first. Slowly pull over to the side of the road as soon as you start to hear these noises. Make sure that you keep a good distance from the road in case you have a flat tyre instead and need to change it.

These are the different noises your brakes make that you should be fully aware of:

Grinding – grinding is usually the sound of two metal pieces rubbing together. So know that this means that you have a severely damaged brake pad. Without a brake pad, there is nothing that is stopping you safely. It is recommended that you do not continue to drive as it could prevent you from stopping at a traffic light.

Knocking from the rear – this constant annoying sound you hear when applying brakes indicates that there is a problem with the rear drums. There could be a possibility that the brake or rear drum has been resurfaced which is causing that knocking sound. Fixing this problem can be done by yourself but it would be wise to get a technician to fix it.

Squeaking – this is a sign that wear has been done to the brakes. If not fixed it could be dangerous to you. The squeaking sound is usually caused by a wear indicator. This lets the driver know that wear is being detected. Make sure that you get the brakes replaced immediately. You can still drive a good distance before being in danger but make sure that they get replaced soon.

If you are aware of the problem whilst you are driving and know that the problem is dangerous to you and other drivers make sure that you switch your hazard lights on and drive slowly and calmly. If your brakes don’t work at all, release the accelerator and slowly move into the side lane. With the car losing momentum you will eventually come to a stop. Engine braking will also assist the car to slow down. Engine braking is achieved by gearing down.

When you are close to coming to a stop, pull up the hand brake slowly so that your wheels don’t lock up thus making you swerve around dangerously.

The Mercedes Tuning – What Are The Reasons To Tune Your Vehicle?

We are very well aware of the shooting fuel prices in the market. Hence, it is crucial to tune your Mercedes, so that it delivers great mpg. There are many reasons of the Mercedes tuning like better acceleration, enhanced torque, great economy, more power, healthier engine etc.

We have seen rapid growth in the technology in the field of automobiles. The super chip tuning technology is developed especially for the premium cars like Mercedes. The tuning is efficient for both the petrol and diesel version of car. It will ensure that your car gives best performance without any hassle.

Importance of tuning

Once the vehicle is tuned, it will reduce the emission and improve the performance by 15%. It is quite obvious that tuning will help your vehicle in multiple ways. However, you must tune the vehicle timely to avoid any inconvenience. The experts recommend visiting to the mechanic once in three months. The professionals will make sure that none of the part needs repairing.

As the fuel prices have increased, so does the dependency on vehicles. It is crucial to keep your car in good shape. If you maintain the car properly, then the car will run efficiently for long years without any hassle. Else, it would require regular repairing that will ultimately lead to lower mpg and reduce the performance.

What to consider while tuning the exhaust system?

The exhaust system of the Mercedes includes a front pipe, exhaust manifold, catalyst converter, silencer, exhaust tip and tail pipe. While tuning the system, muffler is the easiest to deal. The professionals will replace the stock muffler with high performance muffler.

As a result, you will get a free flow exhaust system. You must keep in mind that the inlet and outlet pipe of the muffler is of the same size as front and tail pipe. Check out the diameter of tail and front pipe. They must have same dimensions for better performance. Other terms of the exhaust system is a little complicated to understand. You must have knowledge of the engine’s power band, exhaust back pressure and usable RPM.

If excessive pressure is produced by the system, then it will have a negative impact on the performance of the engine. This will restrict the flow of exhaust gases. As a result, the engine will be inefficient to expel exhaust gases. Ultimately, it would lead to much reduced engine power.

Dos and the don’ts

Make sure that you never attach pea-shooter instead of the exhaust system to the engine. You must also not install a 10 inch wastewater pipe. In case the exhaust pipe is big enough, then it will lead to much reduced flow velocity of the gases. You have to keep in mind to get the exhaust back pressure perfect.

While tuning the exhaust system, the professionals aim to increase the power of the engine by the right exhaust tuning.