"Bwaaaah. Bu. Bu. BWAAAAH! Flat but percussive with rough, loping edges, it could only be a boxer four. Rough and inconstant, the gloriously impure gargling swells with each passing second, gaining pitch and volume as the revs continue to climb. "
Ludicrously Freakin’ Awesome Lexus in Action
Ok, so you’ve probably heard that the long awaited Lexus supercar has been badged with the silly pricetag of £350K and that it goes like stik and that anyone with a heart and two ears could not but love the sound of its V10 engine. But now there’s a way to experience the sound of the LFA without being a jammy car hack or the heir to a tobacco fortune.
When designing the LFA’s exhaust system, the team at Lexus apparently studied the noise made by a Formula 1 car at maximum revs, then applied detailed design features to create an exhaust note for the LFA that is unlike any other car on the road, enhancing the sensation of speed and acceleration.
The car’s main silencer is made of titanium and has a valve-actuated, dual-stage structure that channels the exhaust flow according to engine speed. Up to 3,000rpm, the exhaust valve stays closed, routing the flow through multiple chambers, creating an unobtrusive note. Above 3,000rpm the valve opens, allowing the exhaust to bypass these chambers and flow into a single resonance chamber, before exiting through the stacked trio of tailpipes.
The V10’s induction system was also modified to complement the engine’s acoustic qualities. The uniquely formed horizontally split resin surge tank – a unique design – mimics the acoustic chamber of wind and string instruments: up to 4,000rpm it emits the engine’s primary firing frequency of 300Hz; this changes to 400 to 500Hz as the engine revs climb to 6,000rpm; and a peak is reached at 600Hz as the engine wails towards its 9,000rpm red line.
The air intake is made from a porous duct material to generate bass to mid-range tones. The LFA development team called this acoustic effect ‘Resonated Complex Harmony.’
If the above couple of paragraph read like Greek mumbo jumbo to you, then you’re not alone: but any fool can understand that piping the exhaust note into the cabin can only improve the driving experience.
The engine’s induction and exhaust soundtrack are channelled into the LFA’s cabin, so people on board can enjoy the experience as much as those on the outside. The main sound channel that pipes in the engine’s induction notes runs from the surge tank into the cabin below the main dashboard panel.
Two further sound channels run 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. Together with the primary sound channel, these put the driver at the centre of the LFA team calls the ‘3D Surround Sound Concept.’
This thrilling acoustic performance of theV10 engine can now be heard online, available in the sound library at the dedicated LFA site www.lexus-LFA.com
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