Bar values appearing turbocharger delivered to the engine

Bar values appearing turbocharger delivered to the engine is the supercharging pressure of the air in units of kg / m3, Bar, Psi. The units are not new to us, because it is also present in other areas, such as tire pressure and so on. clio dci turbo This value depends on the level of boost turbocharger specifications to the public EA113 the 1.8T engine, for example (ie, FAW - Volkswagen Bora used on the 1.8T engine), it uses a turbocharger is provided KKK the K-03 turbines, maximum boost is 0.3bar / instantaneous maximum boost is 0.5bar.

Another important parameter is the A / R value, used to express the characteristics of the turbine in the turbocharger conversion market sales volumes are often marked. A represents Aera region refers turbine exhaust side entrance to the narrowest cross-sectional area (that is, the variable area turbine technology in the "cross section"), R (Radius) is the mean radius of the representative, the inlet means is narrowest cross-sectional area of the center to the center of the body from the turbine, while the proportion of the two is a / R value. In contrast, the influence of A / R values of the inlet end of the impeller by the pressure is not large, but the A / R values of the exhaust end of the turbine but then has a very important significance.

The guide vane opening degree of the turbine guide vanes can affect the flow rate, the opening is small at low speed (on the left), to increase the air flow rate, the opening degree (right) at high speeds, reducing the exhaust vacuum. High A / R The smaller the value, the discharge flow rate of the exhaust gas turbocharger in the low speed region of the reaction faster reduce turbo lag, the turbine is able to achieve a higher rotational speed of the supercharger in the lower region. But A / R value is smaller, kubistar turbo increasing the exhaust back pressure less than the high speed gas flow so that the power output is limited in case of high revolution. In contrast, A / R value is larger, the reaction in the low speed range of the turbine worse, despite the poor effect of supercharging the engine low speed, but it can produce high engine speeds greater power, higher power high to a considerable tendency clear.

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