Diesel engine AUDI 80/90 with a power of 59 kW (80 HP) equipped with a turbocharger. On the turbocharger shaft there are two turbine wheels, gas and air, located in two separate housings. The turbine wheels are driven by exhaust gases from the engine. At the same time, the turbocharger shaft rotates at a speed of 12,000 rpm, forcing air into the cylinders, which creates a good filling of the cylinders.
Thanks to this filling, engine power increases up to 100%. The degree of increase in engine power depends on the discharge pressure, which is 0.4-0.8 bar (tire pressure is 1.8 bar). If the discharge pressure exceeds the factory setting, the valve opens and the pressure may decrease.
In addition to the increase in power, the turbocharger provides an increase in torque, which primarily contributes to smoother engine operation. As a general rule, the engine must be revving around 3000 rpm for boost pressure to be noticeable.
In contrast to the petrol engine, the diesel engine has a high compression ratio, which contributes to the complete combustion of the fuel even in the low speed range.
The turbocharger is a very precise design. Therefore, it is recommended that it be repaired only in a specialized workshop. As a rule, if there is a malfunction, the turbocharger is replaced as a set.
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