How to Read the Engine Tachometer?

[MarcusFitz]

Here is how to read the engine tachometer: 1. Starting: Start at 1500-2000 r/min. The starting RPM for a cold start should not be too high, as the lubricating oil cannot reach the upper part of the engine during a cold start, and excessively high RPM can cause significant wear. For a warm start, a slightly higher RPM can be used for a more powerful start. 2. Gear shifting: Applicable only to manual transmissions. Shifting around 2500 r/min is generally optimal, as gear changes are often smooth and powerful, and the engine operates more economically. For rapid acceleration, shifting above 3000 r/min is recommended, as the vehicle's power performance is superior at this point. 3. Turbocharging: Turbocharging works by using high-speed exhaust gases to spin a rotor, thereby increasing the air pressure in the intake manifold. Turbocharging typically operates efficiently around 1800 r/min, where the engine's power begins to increase significantly, while it has minimal effect at low RPMs.