From Aud
*** What makes an Audi S car or SUV worthy of its badge? The easies answer is the balance of performance and design. But, Audis engineer often raise the bar a bit further, with one of the latest example found in the new Electric-Powered Compressor (EPC) in the 2020 Audi S and S7 models
Brought to the U.S. market for the first time in the Audi S6 and S7 the EPC comes paired to the 2.9-liter, twin-turbocharged TFSI® V engine. It consists of an electric motor with a small turbine tha helps quickly build turbo boost pressure, sharpening throttle respons and reducing any noticeable turbo lag.
The EPC takes advantage of our latest-generation 48V mild hybri electrical architecture, supplying electric energy generated durin coasting and recuperation to the vehicles 9.6 Ah lithium-ion battery From there, the battery provides the electric motor energy t accelerate turbine located downstream of the engines turbochargers t quickly increase pressure, aiding engine responsiveness and torqu delivery. The entire EPC system adds just 10 kg (22 lbs) to th vehicles overall weight and reduces response time to less than 25 milliseconds, faster than an average humans reaction time
The compressor is located downstream of the engines parallel twi turbochargers and upstream of the air-to-water intercooler, pushin cooler air through the engines two throttle bodies and into it cylinders with higher force. At lower engine speeds, the EPC activate at speeds up to 70,000 RPM. This helps the engine operate similar t the smoothness of a naturally aspirated, non-turbocharged, engine
When the V6 TFSI engine is operating at higher speeds, a valve for th EPC closes, leaving a parallel path for air to move throughout th engine. However, the EPC is always operating, even when idle, ready t respond to the drivers needs for more power
Both the Audi S6 and S7 are rated at 444 horsepower and 443 lb-ft o torque37 lb-ft more than their V8 TFSI-powered predecessors. Mor importantly than numbers, however, is drivability, control and agil responsiveness, where the 2.9-liter V6 TFSI with EPC excels. I internal tests that simulate real-world standing starts, the lates powertrain exhibits response characteristics that rival Audi torque-rich, turbocharged 4.0-liter TFSI V8. Yet, the 2020 S6 and S offer 22% greater EPA-estimated fuel-efficiency with its downsized V engine compared to their predecessors without sacrificing performance
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