Re: Intercooler, sim ou não?
Tirado dum artigo técnico da AUDI acerca do audi 100 2.5tdi :
Kuhnle Koop and Kausch (KKK) K-16
The turbine housing material has been optimized for the high exhaust temperatures encountered. In the case of excessive boost pressure, the wastegate opens and the turbine receives only a portion of the hot exhaust gases while the remainder flow directly into the exhaust pipe. As a result, turbine and impeller speed are reduced and the designed boost pressure is maintained. Turbocharger boost pressure begins to develop at 1,400 rpm and is regulated with a maximum wastegate movement of 10mm. At 0.6 bar the wastegate actuator remains closed, at .8 bar the wastegate actuator is opened one half maximum at 5mm, and at 1.0 bar the wastegate actuator is opened the full 10mm, thereby regulating the boost pressure to about 0.8 bar throughout the turbochargers operational range. Boost pressure development of the turbocharger allows a Pressure Ratio (P2/PI) of 1.1 at 1,400 rpm, 1.3 at 2,000 rpm, 1.5 at 3,000 rpm, and 1.7 maximum at 4,000 rpm.
This corresponds to a full load boost pressure of 0.8 bar from 2,220 rpm to 3,750 rpm. Being as the turbo boost pressures were held to an average max. of 0.8 bar, a charge air cooler (intercooler) was not needed to lower the intake air temperature. Exhaust turbine inlet and exhaust temperatures did not exceed 850 degrees F. at maximum load.
Tirado dum artigo técnico da AUDI acerca do audi 100 2.5tdi :
Kuhnle Koop and Kausch (KKK) K-16
The turbine housing material has been optimized for the high exhaust temperatures encountered. In the case of excessive boost pressure, the wastegate opens and the turbine receives only a portion of the hot exhaust gases while the remainder flow directly into the exhaust pipe. As a result, turbine and impeller speed are reduced and the designed boost pressure is maintained. Turbocharger boost pressure begins to develop at 1,400 rpm and is regulated with a maximum wastegate movement of 10mm. At 0.6 bar the wastegate actuator remains closed, at .8 bar the wastegate actuator is opened one half maximum at 5mm, and at 1.0 bar the wastegate actuator is opened the full 10mm, thereby regulating the boost pressure to about 0.8 bar throughout the turbochargers operational range. Boost pressure development of the turbocharger allows a Pressure Ratio (P2/PI) of 1.1 at 1,400 rpm, 1.3 at 2,000 rpm, 1.5 at 3,000 rpm, and 1.7 maximum at 4,000 rpm.
This corresponds to a full load boost pressure of 0.8 bar from 2,220 rpm to 3,750 rpm. Being as the turbo boost pressures were held to an average max. of 0.8 bar, a charge air cooler (intercooler) was not needed to lower the intake air temperature. Exhaust turbine inlet and exhaust temperatures did not exceed 850 degrees F. at maximum load.
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