lexus-lfa-engine-bay

Lexus has released an awesome video which features the Lexus LFA‘s V10 engine in various “stages of symphony”, whether its a low rev growl or a high rev shriek, it’s all there! Lexus calls the engine’s soundtrack “F1-inspired”, and details some of the methods they used to make the engine sound the way it does.

The LFA’s acoustic team studied the noise made by a Formula 1 car at maximum revs, then applied certain design features to create an F1-inspired exhaust note for the LFA. The main exhaust silencer is made from titanium and has a valve-actuated dual-stage structure that channels the exhaust gases differently according to engine speed.

From idle up to 3,000rpm, the valve stays closed, routing the exhaust flow through multiple chambers, creating an unobtrusive note. From 3,000rpm onwards the valve opens, allowing the exhaust  to flow into a single resonance chamber instead. The gases finally exit at a stacked trio of tailpipes.

There was work done to the induction system as well. A horizontally split resin surge tank mimics the acoustic chamber of wind and string instruments. Up to 4,000rpm it emits the engine’s primary firing frequency of 300Hz. This increases to 400Hz from 4,000rpm up to 6,000rpm, and goes up to a peak of 600Hz at the engine’s 9,000rpm redline. The air intake is constructed from a porous duct material to generate bass to mid-range tones. Lexus gives all of this stuff a buzzword – Resonated Complex Harmony.

Both the induction and exhaust sounds are channelled into the LFA’s interior so the passengers can enjoy the sounds as much as those on the outside. There are just too many cars out there that sound good on the outside but are just too silent on the inside. The sound mostly flows in through a sound channel that runs from the surge tank into the cabin below the main dashboard panel. Two additional sound channels un to an opening in the upper cowl on top of the dashboard structure and a reflector panel low down at the front of the cabin.

But enough of text – watch the video and listen to the LFA after the jump! To me, it isn’t exactly like an F1 car, they’re way more high pitched! It does sound very good though, I guess the term F1-“inspired” could mean anything eh?

VIDEO: Lexus LFA Soundtrack

AUDIO CLIP: Lexus LFA by Yamaha

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