The new development in the Audi RS5 TDI concept makes the diesel engine sportier and more efficient. The V6 bi-turbo produces 385bhp and 750Nm of torque while the supplemental electric turbocharger provides for staggering power when starting off.
An electric motor replaces the turbine wheel and accelerates the compressor wheel to over 70,000rpm in a few hundredths of a second. The exhaust turbochargers also provide as much as 2.4 bar of relative boost pressure.
This combination enables the Audi RS5 TDI concept to sprint from nought to century mark in just four seconds. Sprint to 200km/h mark is achieved in less than 16 seconds, while top speed is at 280km/h. The average fuel consumption is less than 5.3L/100km and CO2 emissions are lower than 140g/km.
Recuperation is the primary source of the drive energy for the electric turbocharger. To transmit this energy, the RS5 TDI concept uses a separate 48V electrical system that is connected to the conventional 12V electrical system via a DC/DC converter. The energy is stored in a compact lithium-ion battery. The advantage of 48V electrical systems is that they enable the transmission of larger amounts of energy.
