The induction noise
is exquisite as it howls and growls down the straights.
Also, an air induction resonator reduces induction noise
It's quiet, too, compared to the petrol engine which suffers from induction noise
when accelerating hard.
Noise attenuation poses a special challenge because of the difficulties in reducing induction noise within the induction system without affecting engine performance.
The magnitude of induction noise that results is a function of the manifold geometry.
Siemens is currently carrying out engine manifold tuning studies with respect to engine performance and induction noise.
At 4,500rpm there's a crackle of exhaust and a bark of induction noise
as the ST Mountune sprints forwards.
Lay into that extended torque band, and a "sound symposer," which amplifies the engine's induction noise
into the quiet cabin, converts the EcoBoost's well-oiled mechanical whirr into a subtle induction woffle.
However, it can adjust the tone and volume with its "sound creator", designed to artificially amplify the V-6 induction noise
to enhance the sensation of acceleration.
It sounds like the machine that turns a teen's scratchy warbling into an X Factor winner but it's actually a device that takes the induction noise
from the engine's intake manifold and feeds it into the cabin.
Body mounting prevents the housing from becoming a potential engine noise amplifier, while rubber mounting keeps it from transmitting induction noise
to the body structure.
As for sound, the 748 (pounds 7799 on the road) can't come up with a sonic boom, but the induction noise
from its sucking twin sounds like a throaty bullfrog amplified through a rock band's speaker system.