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30 / 4 / 2020
THE LEXUS LC CONVERTIBLE: PRODUCING THE PERFECT SOFT TOP
Multi-layered roof can be raised or lowered in 15 seconds
Tested 18,000 times to ensure lasting quality
Ingenious design looks smart and preserves load space when stowed
New roof even contributes to the car’s dynamic handling
Lexus has never made a soft-top car before, but it has spared no efforts in coming up with the perfect roof for the new LC Convertible.
Not only does it give the car the same sleek and smart silhouette as the LC coupe, its clever engineering means it operates quietly and quickly, and doesn’t eat up valuable load space when it is stowed.
A folding roof mechanism is usually expected to last around 10 years before it needs mechanical attention, but a Lexus calls for the best quality and reliability. That’s why engineers tested the roof to breaking point, finding that it could last through around 18,000 open and closing cycles before a problem occurred – even then a minor one.
The rigorous programme also proved the system works just as well in freezing temperatures and snow.
PEACE AND QUIET
A quiet cabin free-from outside noise and vibration is an important part of Lexus’ omotenashi principles of ultimate customer care. The LC Convertible’s multi-layered canvas roof is effective in blocking out unwanted noise and its hydraulic motor works quietly and efficiently.
It’s common for convertibles to sacrifice load space in order to make room for the roof when it’s lowered. The Lexus LC Convertible offers just as much room in the luggage compartment as the coupe model – 172 litres – as clever engineering and design have enabled the top to be folded in between the rear suspension towers and for its hydraulic motor unit to be fitted in the empty space behind the rear seats.
UP OR DOWN IN 15 SECONDS
Fifteen seconds is all it takes to raise or lower the roof, and the job can be done even when the car is on the move – at speeds up to 50 km/h. Once again testing was thorough, with the development team using a wind tunnel to ensure the system could cope with different speeds and driving conditions, including headwinds.
The goal was not to make the roof action as fast as possible, but to give it a suitably refined action. There is even a slight pause before the main part of the process happens, a detail that’s an echo of how traditional Japanese calligraphers produce a character on the page.
SPEED AND BALANCE
Lexus was determined that the convertible should be every bit as fast as the coupe and used both a wind tunnel and test track to ensure the top speed could be achieved, roof up or roof down.
When it comes to handling, the new roof actually makes a positive contribution to the car’s dynamics. That’s thanks to all its main parts being set within the car’s wheelbase, it actually has a lower centre of gravity than the coupe – key to its excellent balance and great driving character. Lexus even used a rare combination of magnesium and aluminium to keep the weight of the roof’s frame to a minimum without compromising quality of performance.
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