IngRobNy it is preferred to edit your posts instead of double, or even quadruple post. If you want to quote multiple people, just click each post's quote button, it should all appear in the text box. It's possible on mobile, also.
Have you driven the Audi RS6? At times I feel like I hear an intake "whirl" of some sort.. It's pretty interesting that car..
...
I wasn't ignoring this. I can't say I hear a proper intake sound for this car. It is a turbo motor, so that makes things tricky anyway. What gives the impression of intake in this case is a layered exhaust sound, containing a few different textures. "Whirl" isn't really descriptive of what induction noise from a piston engine sounds like.
It's caused by the intake valve opening and allowing the pressure to equalise between the cylinder and whatever is feeding it. The piston is also travelling quite rapidly, so the pressure fluctuates rapidly also, causing a violent onset of pumping (drawing the air into the cylinder), which is also audible, as more than just "white noise", primarily because of resonance effects (the cylinder and its ports form a Helmholtz oscillator). All of this combines to create a texture, rather than discrete audible events (unless it's a very slow engine).
So, part of the delay in responding was because I wanted to construct a proper post showing the vast range of intake sounds to be heard:
Quick demo of dynamically changing the volume of the intake sound (inline 4).
S2000 Stock intake vs top panel removed
Another S2000, this clip is all intake from 2 minutes.
S2000 Injen Intake
The first video here shows the effect of plumbing configuration on the same engine type. All cars use a large open plenum with individual throttle bodies, so the difference in engine mounting orientation creates a difference in sound; the Audi is longitudinal, the others transverse (the Mondeo at
4:37 is a nice contrast, being a V6). In the second vid, it's clear that carburettors can sound much the same, it's all in the tune and plumbing.
SUPER TOURENWAGEN STW at Hillclimb 2013, Audi A4, Ford Mondeo V6, Opel, Vauxhall, Alfa Romeo 155
Fastest Ford Escort MK1, Always Sideways, VHC Champion Suisse 2013. Florian Gonon / Michel Horgnies
More V6 ITB goodness; the metro is uneven firing.
kl v6 miata
Colin McRae, Rally, Big Moment / near miss, 2006, Donegal Rally, Ireland.
Straight 6
BMW M3 - CSL Airbox Conversion Sound Check
By extension, the V12. Three different firing orders.
Paul Stewart and the McLaren F1 pt2
Harry's Metcalfe's Garage- Ferrari 330 GT 2+2- EVO Video Diary Pt. 2
Ferrari 512bb at Brands Hatch
Now the crossplane V8, the SLS illustrates the difference between the exhaust and intake sounds beautifully, because the restrictors act as a high-pass filter, so the intake (
1:45, 1:55 etc.) is very tinny, losing a lot of bass - this serves to highlight its texture. The Climax is a bit of fun (1.5 litres, 9000+ rpm) and the NASCAR car for reference; it should be clear from the Goodwood video the role that intake plays in the sound of classic American V8 sounds, i.e. the Cobra Daytona.
► Mercedes SLS AMG GT3 - Test run on racetrack
Jim Clark @ Oulton Park
Marcos Ambrose 2013 Cheez-It 355 onboard last half of race from Watkins Glen, NY.
Goodwood Revival Meeting 2011 RAC Tourist Trophy Celebration (RAC TT race) Full HD!
The flatplane V8 is equally meaty, but possibly more sweet-sounding.
RST-V8
BMW 134 Judd V8 - Georg Plasa - 40. Trierer Bergrennen 2011
And some V10s. Different firing orders, but the M5 is also uneven-firing, the LFA even (couldn't get that exhaust sound any other way).
BMW M5 Dyno Test with K&N Intake
Sounds of the Lexus LFA recorded by Yamaha
The intake sound communicates what the driver's right foot is doing, because opening the throttle is like opening a door to a noisy room. It doesn't just apply to NA machines, either; it's important for turbo engines, too. Although the sound is slightly muffled through the intercooler (as applicable) and the compressor, some of it escapes through the surfaces of the intake plumbing, particularly the manifold. The cam timings for a boosted engine are very different as compared with a performance NA engine, so the tone is slightly more light and crunchy, and the compressor also filters out a lot of the bass. But the sound is still there and its absence would be noticed by anyone, even if they couldn't say why.
In this video, you can hear the throttle open and clear induction sound before the boost has chance to build (which causes the wastegate to dump exhaust into the screamer pipe...), it's audible e.g. at
1:13.
The ultimate sound of Nissan Skyline GTR R33 800 hp tribute to RB26 - pure lound sound