- Toyota Direct-Shift Gearbox

How Many Gears Is Too Many

23w ago

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There are very legitimate reasons why we're seeing 10-speed automatic transmissions implemented in new cars, such as the Lexus LC500. More gears means a broader range of gear ratios without massive steps between those gear ratios. It means you can keep your car's engine closer to peak horsepower in order to achieve maximum acceleration, and it means you can put your engine in the right load and RPM range in order to maximize efficiency.

This video will dive into the details of why more gears can be a good thing, even with the negative consequences such as additional complexity, frequent gear shifts, and time lost in acceleration from more frequent shifts. The Lexus LC500 pairs a 5.0 naturally aspirated V8 to a 10-speed automatic transmission, and it sounds quick beautiful churning through the gears. That's not to say the transmission isn't without flaws. Check out the video for full thoughts on 10-speed transmissions and the implementation within the LC500.

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Comments (13)
  • Dynaflow is the trade name for a type of two-speed automatic transmission that was built for Buick from 1947 to 1963. The Dynaflow set itself apart from its competition with its ability to shift smoothly from one speed to the next. This was a vast improvement over most automatic gearboxes of the time, which tended to lurch their way through gear settings. It was also a vindication of torque converter-equipped transmissions, setting the standard for their use up to the present day.-Posted by ETE Product Support on Wednesday, March 12th, 2014 .

    3 months ago
  • Holden 2 speed Auto - the " Powerglide " 1950s to early 70s - a 1178 kg, 108 or 145 BHP 1967 Aussie HR Holden could get about 30 mpg around town with this gearbox . Very calmly.

    3 months ago

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