How to shift gears down. Proper downshifting

The ability to reduce transmission – is no less important than their proper shift up. Are you sure that you correctly switch down?

2015-11-15 08:58:31 58

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The ability to reduce transmission – is no less important than the correct shift up. Are you sure that you correctly switch down?

the details of the process

The downshifting is an indispensable element for the correct execution of the maneuver of overtaking, but most often it is used when you want to slow down the speed of movement of the vehicle. Consider what happens to a vehicle when switching into low gear. Moving at high speed, the driver throttle, squeeze grip, includes the lower gear and releases the clutch. Car wheels rotate at a certain more or less constant speed, a comparable speed rotates the output shaft of the gearbox. At the moment of transition into low gear and driven shafts of the box included in the connection using the other gear of the driven shaft having the greater number of teeth than previously used. Due to changes in gear ratios gear transmission, the rotation speed of the gearbox shaft is substantially increased, while the speed of rotation of the crankshaft of the engine remains about the same. When you release the clutch there is a connection of the crankshaft with a leading shaft of a transmission. The drive shaft of the box, which has a higher speed of rotation, will attempt to spin the crankshaft to the speed of rotation of the motor to a higher rpm. Due to the fact that the rotating parts of the motor have considerable weight and therefore have a decent inertia, the instantaneous acceleration will not happen – the car "bite his nose". Is it possible to achieve smooth, without jerks, the movement of the machine during a downshift? Two methods: smooth (with a delay of several seconds) release the clutch pedal and peregazovkoy.

a Gradual release of the clutch pedal

If the clutch pedal after switching to a lower gear to let go immediately, but to hold her in one position for 2-3 seconds (no longer needed) to the point of "gripping" of the clutch, the engine will Rev up smoothly. The same will be smooth and the movement of the car the whole time. The method is simple, but very harmful to the clutch, since the adjustment of the engine speed and gearbox shaft occurs due to the mutual sliding of the discs of the clutch mechanism. Thus there is intense wear, which in the case of frequent and inept repetition of such operation, the clutch can simply "burn". Smooth releasing of the clutch for the novice, still learning his driving, experienced drivers switch to low gear using peregazovki.


Method peregazovki came to us from the middle of the last century, when gearbox trucks (more trucks) were not equipped with synchronizers, which include low transmission without further manipulation was simply impossible. The essence of the method is to increase revolutions of the engine before inclusion of low transmission, thereby ensuring the alignment of the rotational speeds of the crankshaft and driven shaft of the gearbox. The technique peregazovki is as follows: simultaneously with the release of the throttle pedal is pressing the clutch pedal, the gear lever is translated to the neutral position after the clutch pedal is released. By doing a short push on the accelerator, causing the engine gain more revs, you press the brake pedal, turn the lower gear and release the clutch pedal (with no delay). Double declutching can do and can – not, however, be aware that in carrying out a double extraction when neutral gear to spin will be not only the engine but also the drive shaft of the gearbox. This way you significantly "simplify the life" of synchronizers, extending their service life. The further course of action depends on your intentions. If you lowered the gear in order to accelerate before performing overtaking, feel free to step on the accelerator and proceed to its implementation. In the case when the gear is down due to the need to slow down using engine braking, the pedal should be released. Good luck to you! No nail, no wand!

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