The 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 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. 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.
Racing toward its 2010 model year debut, the Lexus supercar, spied during testing at the famed Nurburgring, is being developed to compete with no less than the Ferrari F430 and other high-strung sports cars. About the same size as the F430, the LF-A as shown at Detroit in ’06 is about two inches shorter than a Porsche 911, but has about nine extra inches of wheelbase.
Its powerplant is still a question. Originally conceived as a tribute to Toyota’s Formula One prowess, that team has yet to score a victory, and besides, they’re running V-8s now instead of V-10s. So the rumored 500-plus-horsepower V-10 might instead be a twin-turbo V-8 based on the LS’ 5.0-liter engine. It needs at least 600 horses and a top speed of about 200 mph to play in the ultra-sport field.
In a similar manner, the radical switch to CFRP production for the LFA’s development pushed the technical boundaries as the engineers moved from TMC’s traditional weaving looms to the sophisticated three-dimensional carbon fiber looms. As well as reaping the technological benefits of this progress, the use of lightweight CFRP material over heavier metals also reduces the LFA’s impact on the environment.
A striking example of the benefit Tanahashi and his team extracted from Toyota Motor Corporation’s weaving heritage was the development of the company’s broken thread detection technology incorporated into its original fabric weaving looms. Updating the mechanical thread sensors with incredibly accurate laser technology to monitor fabric integrity not only gave the team a crucial insight into the weaving process but also saved critical development time.
Source: DistroCar
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