The internal combustion side of the hybrid system is familiar. Under the hood is the corporate twin-turbocharged 2.9-liter V-6. It’s the same engine Porsche uses in versions of the Macan and Cayenne and that Audi bolts in, among other things, the S6 and S7 sports sedans. A 325-hp version of the 2.9-liter is now the standard powerplant in the base 2021 Panamera. In the new Panamera 4S E-Hybrid it has a more serious 443 horsepower and 405 pound-feet of torque.
Between the new engine and its eight-speed dual-clutch automatic transmission, Porsche crams in the heart of the E-Hybrid system: a 134-hp electric motor. While 134 is a modest number of ponies, the motor also thumps along with 295 pound-feet of instant torque. The combination feeds the V-6 and the electric whizzer directly into the transmission. And it’s all good for 552 horsepower and a thumping 553 pound-feet of torque. If you’re checking our math, the motor and engine outputs don’t add up to 577 horsepower and 700 pound-feet of torque because the motor and engine don’t peak at the same rpm.
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