Types of VAZ gearboxes Gearbox is a device that transmits and converts torque, with one or more mechanical gears. Gearboxes have many characteristics such as efficiency, gear ratio, power transmitted, maximum shaft angular speeds, number of driven and driven shafts, type and number of gears and stages. The VAZ automobile gearbox has a mechanical transmission, a transmission and two driven shafts. First of all, when choosing a gearbox, you need to pay attention to the gear ratio. VAZs were constantly equipped with gearboxes with a gear ratio of 3.9 4.1 4.3 4.44. These numbers indicate that for the wheel to complete one revolution, the driveshaft must make 3.9, 4.1, 4.3 and 4.44 revolutions respectively. The graph shows the dependence of vehicle speed on engine speed at different main torques in the gearbox (at constant gear ratios)
As you can see from the graph, the higher the main torque ratio in the gearbox, the faster the car picks up speed, but at the same time the maximum speed is lost. Therefore, when choosing the main torque, it is necessary to take into account the degree of preparation of the engine and the type of behavior of the machine. Each gear change takes time, both for the gear shift process and for the clutch slip time. With short base torque, we have a very good level of acceleration, but it's very short and you have to take more breaks in acceleration to change gears, which negates any benefits of short base torque. On the other hand, in rallying, short HPs are a well-deserved success, as are the closest rows of gear shifts, so that they have the highest possible speed at any point in any corner, so rally drivers sacrifice both speeds of straight line acceleration in order to always have the right gear at turns. But in the case of the brake, everything is different, and those with a relatively weak engine are saved by a short transmission and end up cutting out in 5-6 gears. In addition to gearboxes with standard gear ratios, there are “sports” gearboxes with gear ratios of 4.78 5.13 5.38.
It would seem that nothing can be improved on the classics. However, there are 3 gearbox options and 4 rear axle shifts. There are boxes 2101, 2105, 2106. The gears (1st, 2nd, 3rd) of 2101 are shorter than those of 2105, and longer of 2106. Gearboxes are available with gear ratios of 3.9, 4.1, 4.3, 4.44. How to find out the gear ratio of a gearbox? Raise the rear wheel, put it in neutral, make 10 rotations of the wheel and count the revolutions of the cardan.
Cardan speed 19.5 | 20.5 | 21.5 | 22.5 Gear ratio 3.9 | 4.1 | 4.3 | 4.44
What does the transfer report provide? The larger it is, the lower the speed in all gears at the same number of revolutions. For standard gears with a 1500 engine, a 2105 gearbox and a 4.1 axle are installed at the factory. If the engine is 1600, the gearbox is original (2106), the axle is 3.9 or 4.1. Let's say all cars have 175/65R13 tires. Now let's look at the graph (photo 1) of the dependence of car speed on engine speed (the standard 1500 with a 2105 gearbox and a 4.1 axle will be marked in green on the graphs. Why - because there are more of them than all the others).
With the 2106 gearbox and a standard 4.1 axle (raspberry) with a standard engine, we get an increase in dynamics only due to the long 1st gear, the 2.3 steel is longer, which is not good (with a standard engine). If the engine is boosted, long gears are what you want - maximum power will be delivered over a wider speed range without sacrificing dynamics. For example, let's take gearbox 2106 and gearbox 3.9 (crimson)
All the programs here are longer (especially the first one). For example, in our version in first gear the speed range of 3500-6500 drops to a speed of 28-53 km/h, and in the standard 25-45 km/h. Feel the difference! By the way, in this configuration, the first, second and third gears completely coincide with the 11th row on the chisels (with a jumper of 3.7), the fourth is shorter, and if the fifth is not much longer than the fourth chisel chisel. Indeed, everything new is well forgotten old :). It's a different matter if you install a 4.44 bridge (raspberry)
Compare: 1 is longer
