Metro666
Well-known member
In 1989, Toyota Celsior, destined to go abroad as the first flagship for LEXUS, the LS400, achieved a 120km/h (70mph) cruising speed cabin sound level of 63db. That's about as quiet as an empty office with a few PC's humming.
This was over 31 years ago.
Toyota did this without digital noise cancelling, nor exuberant use of sound deadening in the body structures. They did this by sampling over 500 different prototype timing belts on the engine, and by having Yamaha engineers go through acoustic characters of every section of the engine from intake to the valvetrain with the same process as their musical instruments. Aisin to invent and register 33 new patents to reduce mechanical noise in the transmission and differential gears, bearings, and brakes. Bridgestone to make a set of brand new tires to do the same. Aerodynamic development for every curve, corner, and gap with operations more than spent for Formula One cars. A brand new design of air suspension system to absorb more noise.
At around the same year, a Rolls Royce Camargue/Silver Spur, , Cadillac Fleetwood, and the W140 Mercedes-Benz S500 with premium dual pane glass and weights of far more than the LS registered sound levels almost twice as much as the Lexus LS.
A Tesla Model S, today registers 71 db the same speed, although to be fair, the Tesla does have a set of loud high performance tires.
Brand new, it idled so quietly that Toyota had to install auto-cycling starter mechanisms on the engine, to prevent re-cranking of the engine as new owners would not hear it idle.
Impressionnant de savoir a quel point que Toyota passais leur limite de la technologie a ce point!
Envoyé de mon SM-G960W en utilisant Tapatalk
This was over 31 years ago.
Toyota did this without digital noise cancelling, nor exuberant use of sound deadening in the body structures. They did this by sampling over 500 different prototype timing belts on the engine, and by having Yamaha engineers go through acoustic characters of every section of the engine from intake to the valvetrain with the same process as their musical instruments. Aisin to invent and register 33 new patents to reduce mechanical noise in the transmission and differential gears, bearings, and brakes. Bridgestone to make a set of brand new tires to do the same. Aerodynamic development for every curve, corner, and gap with operations more than spent for Formula One cars. A brand new design of air suspension system to absorb more noise.
At around the same year, a Rolls Royce Camargue/Silver Spur, , Cadillac Fleetwood, and the W140 Mercedes-Benz S500 with premium dual pane glass and weights of far more than the LS registered sound levels almost twice as much as the Lexus LS.
A Tesla Model S, today registers 71 db the same speed, although to be fair, the Tesla does have a set of loud high performance tires.
Brand new, it idled so quietly that Toyota had to install auto-cycling starter mechanisms on the engine, to prevent re-cranking of the engine as new owners would not hear it idle.
Impressionnant de savoir a quel point que Toyota passais leur limite de la technologie a ce point!
Envoyé de mon SM-G960W en utilisant Tapatalk
