" These dyno graphs come courtesy of Supersprint who dyno'd the new C7 RS6 with the 4.0 TFSI twin turbo V8 and the previous generation C6 RS6 with the 5.0 liter TFSI twin turbo V10. The previous generation V10 model was rated at 571 horsepower. The current model with the smaller 4.0 liter V8 is rated by Audi at 553 horsepower. The dyno graphs from Supersprint which were done on a MAHA dyno show that the previous generation car has just slightly over 3 more horsepower.
What is interesting is the 4.0 TFSI actually shows more torque than the 5.0 liter V10. Additionally, despite the torque advantage and the corrected horsepower figures being about 3 horses apart the wheels figures (the blue line) show a difference of 74.8 wheel horsepower which does not make much sense and does not appear to be accurate. The MAHA dyno automatically calculates losses and crank horsepower figures so let's just stick with the crank figures as they seem to be the most accurate.
Basically, the two cars are showing very similar power outputs. Audi was able to go smaller with the 4.0 liter V8 yet is not giving up much of anything. As APR's tuning results show, the 4.0 TSFI is a monster
. Ditching the V10 has turned out to not be the step backward enthusiasts initially suspected it would be.