how to read a tachometer

• 2022-04-08

The normal driving range is within 2000 rpm, which protects the engine and saves fuel, but the acceleration is not very fast. It is also the third gear. The speed increase from 1500 to 2000 is certainly not as fast as that of 2000-2500. Therefore, if you want to increase the speed quickly without fear of fuel consumption and wear, you can appropriately increase the shift speed, such as 2500 shift (almost catching up with 1.8 displacement), 3000 shift (almost catching up with 2.0 displacement), 4000 shift (I barely catch up with BMW with 4000 shift), depending on the situation. It's also easy to explain the downshift acceleration when overtaking. It's just to downshift and increase the speed to 2500-4000 rpm, which makes the force stronger and the speed faster. Otherwise, the speed range is too low, and the acceleration is too meat to achieve the effect of fast overtaking.

Of course, the speed has a weakness. It can only be referred to the value in the gear, which only reflects the value from idle speed to 6000, and neutral gear and semi linkage do not count. Therefore, skip shift should be based on experience. For example, step on the accelerator in the third gear to quickly accelerate overtaking. After the overtaking action is completed, the speed is 4000 and the speed is 80. At this time, don't change to the fourth gear step by step, and directly step up to the fifth gear. It doesn't hurt to try. When you go up to fourth gear, you will find that the speed only drops to 2500 rpm. At this time, you have to go up to fifth gear. Similarly, in the case of high speed, if you encounter a situation in front, you can brake down with one foot and the speed drops rapidly. However, due to the lower limit of the tachometer, you can't judge the gear to be reduced. At this time, you need to rely on the speed to make up for it, but you can know it by practicing more times. For example, when the speed of gear 4 is 60, the speed of one foot brake is only 35. At this time, the speed should be below 1000. It can only be judged by the speed that the gear should be downshifted to gear 3. If the speed drops to 20, it can be directly downshifted to gear 2. If you downshift the wrong gear, if you downshift too much, you will find that the speed will rise rapidly and exceed 2000 rpm (at the same time, the engine sound is also hard to hear, and you will rub the car), which proves that you can downshift to the previous gear. Downshifting is less. I found that the speed is still very low, so I knew I had to continue downshifting. Try a few more times and you will know how to skip the grade.

The above is the detailed introduction of how to look at the speed. The tachometer is necessary for novices. It can let you judge the timing of gear shift. However, for experienced hands, the tachometer is dispensable. It can be seen that the impact of speed on safety is limited.