How to Double Clutch on Your Car?

If you are a fan of the fantastic series Fast & Furious, you must have wondered what double clutching miracle is all about like many other people. This article will show everything that you need to know about double clutching from its definition, how it works and some useful tips to do it.

What is Double Clutching?

Double clutching, also known as double de-clutching in British English, is generally a technique in downshifting that is often used for commercial trucks as well as race cars. In addition, it is also applied in vehicles that do not have a synchronized manual transmission. Thus, if you are owning a modern model, then you might not necessarily have to double clutch.

Here is the reason why double clutching might be not necessary when you are driving the current vehicle. While you are shifting, units called synchronizers would aid the shifting procedure by combining the speeds of rotation between transmission components. In general, the speeds between the fitting elements need to be the same mainly because if all of the transmission components are not rotating at the same velocity, there would not be an even transition.

In other words, double clutching is really important for smoother transition, which would reduce wear and tear in the gearbox.​

Why You Have to Double Clutch?

The first reason, as a car lover, it is one of the most fantastic racing skills to learn and master. And as we mentioned above, it is imperative for non-synchronized transmission, and in addition to being cool, it is also essential in racing. The other reason why you have to double clutch is that it is still the most effective technique to operate the clutch. For instance, in extremely freezing condition, you might need to count on this method for a while.

Here is a specific example of why double clutch is important:​

  • To have a clearer visual, you can image the transmission in 2 parts. The first one is connected to the engine and the other one to axle and wheels. The gearbox lies in the middle, and the gearing is basically 1:1 throughout.
  • You are in the fifth gear driving down the road when you are spotting a vehicle ahead and want to overtake it. In this case, the engine and other transmission components are traveling at 3000 rpm. You would like to downshift to provide the engine more power so that you would overtake. In general, you would step on a clutch, then change to gear 4, and release that clutch.
  • Here is what occurs; when the ratio of gear 5 is haft that of gear 4, the half of the transmission that is connected to the engine will rotate at 6000 rpm, while the other one connected to the axle and wheel still revolves at 3000 rpm. As a result, you would gain more power to overtake when still driving at the same velocity.
  • When it comes to the disadvantage, shifting without fitting rev would lead to wear and tear in the transmission. In some situations, you could even notice the vehicle thrust since the engine is changed to a higher level of rev. If you need to have a smoother transition, then double clutching could be applied.

How to Double Clutch?

But before learning how to double clutch, you should know when to do it first. As we are no longer living in the early 20th century when the only method to downshift a car is double clutching, the following are some cases you might need to to apply this technique:

  • If you need to turn your car, but do not want to press the brake, you could smoothly downshift from gear 4 to gear 2 by double shifting.
  • If you need to extend the synchronizers’ life when downshifting.
  • If you want to drive your vehicle more than 200000 miles.
  • If your the clutch linkage of your car fails.

Here are some simple tips to double clutch:

  • Find a private and quite place such as a parking lot to avoid any serious accidents with other pedestrians or motorists when you are double clutching.
  • For a beginner, start with low gear. You could speed up, and when you reach the 3rd gear, step on the clutch as you often do.
  • As you are stepping on a clutch, change to neutral mode and then release the clutch completely.
  • While still in the neutral mode, press the accelerator to increase the rpm. Your goal is to make sure that the rpm of the engine is a little higher than that when you downshift. By doing this, you would help to match the speed of the transmission with the speed of the engine.
  • Release the accelerator and double clutch.
  • Now you can downshift to the gear of choice.
  • Finally, you need to step off the clutch more quickly than you could normally.

Now that you understand the technique involved in the process of double clutching, make sure to continue practicing it in slow speed until you master it completely. You also need to know that this technique would be applied similarly even in truck driving mainly because truck drivers might depend on engine brakes in some situations to match the transmission speed with the engine speed. This case mostly happens if the loaded trucks have no half gears from gear 1 to 4. It might prove challenging or even impossible to change from the gear 1 to gear 2 or gear 2 to gear 3 when driving a truck on a hill. In stead, they will use a a technique known as Jake shifting in such situations.

John Henry
 

I am John Henry and I have begun to work in automotive industry since the 90s, specializing in car rebuilding and repair. After nearly two decades of working in this complex section, with extensive experience in repairing, troubleshooting and maintaining thousands of cars, I started to work as an auto blogger to share my practical knowledge as well as skills with car owners all around the world through a wide range of articles in online magazine.

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