Originally Posted by southlight
If I understand it correctly Valvelift is a combination of BMW's VANOS (valve control) and Valvetronic (valve lift). What seems to be different is that Audi's Valvelift only controls the intake valve, whereas VANOS in its current stage also has a outlet control. The valve lift of both Audi's and BMW's systems however work on the intake valves only.
How much power gain that new Valvelift system would be good for? Don't know. Both Audi and BMW mention the lower fuel consumption: BMW claimed up to 10% for Valvetronic, Audi 14% for Valvelift.
Agree that it wouldn't be a good idea to feature the V10 in the RS5, the weight increase might be too big.
Best regards, south
How much more of a weight increase would it be?