Hyundai Confirms Ten-Speed Automatics

10 speed, just think of the costs of replacing one of these, I mean I spent nearly 4K to rebuild my 4 speed in my Riviera. These 8, 9, 10 speed trannys are getting a little ridiculous now.

Honestly beyond 6 speeds there is very little to be gained by introducing additional speeds. The fact, all the 7 and 8 speeders skip gears during normal driving should tell you something. Most of the efficiency advantageous from the 7 and 8 speed boxes come from the increased ratio spread -- difference in rato between 1st and the top gear. A typical 6-speed gearbox is ~6:1, whereas the 8-speeders reaches ~7:1.

For the most parts, widening the ratio spread on a 6-speed gearbox will achieve the same efficiency goals. Performance wise, which is preferable depends on the engine type. A peaky, high reving engine will benefit from closer shifts, but an engine with a broad torque band will actually be faster if there are fewer shifts even if there is a larger rpm drop with each because you lose acceleration momentarily during each shift.

Honestly beyond 6 speeds there is very little to be gained by introducing additional speeds. The fact, all the 7 and 8 speeders skip gears during normal driving should tell you something. Most of the efficiency advantageous from the 7 and 8 speed boxes come from the increased ratio spread -- difference in rato between 1st and the top gear. A typical 6-speed gearbox is ~6:1, whereas the 8-speeders reaches ~7:1.

For the most parts, widening the ratio spread on a 6-speed gearbox will achieve the same efficiency goals. Performance wise, which is preferable depends on the engine type. A peaky, high reving engine will benefit from closer shifts, but an engine with a broad torque band will actually be faster if there are fewer shifts even if there is a larger rpm drop with each because you lose acceleration momentarily during each shift.

This.

One of the things I notice about the DSG in the Beetle was how low in the RPM band the transmission keeps the engine during normal driving. It was like there was an invisible line at 2,050 rpm that the computer didn't want to cross. However, at high end highway speeds, it could have used another gear to continue to keep RPMs low.

This.

One of the things I notice about the DSG in the Beetle was how low in the RPM band the transmission keeps the engine during normal driving. It was like there was an invisible line at 2,050 rpm that the computer didn't want to cross. However, at high end highway speeds, it could have used another gear to continue to keep RPMs low.

The Borg-Warner dual clutch boxes used by VW-Audi Group actually do not have a wide ratio spread; it is pretty close ratioed. In fact, it is closer to a close ratio manual than a typical 6A. The DSG's geart ratios are as follows; the axle ratio varies depending on application (diesel cars have a taller axle ratio).

• 1st : 4.04
  
• 2nd : 2.37
  
• 3rd : 1.56
  
• 4th : 1.16
  
• 5th : 0.85
  
• 6th : 0.76
  
• Ratio Spread : 5.32
  

That it goes pretty low at cruise is simply the result of a relatively tall final drive and a control logic that wants to stay low unless prodded.

But it would be Cool to have a Caddy with a 10 or 12 speed tranny

Just think of an Escalade with a large spread to handle both on road and off road better.

10 speeds is just overkill,nuff said!!!

with 8 or 10 speeds it's not like it's gonna use all the speeds now. it can skip....2,4,5,7,9 whatever the engine decides it needs. it would have a wider spread of ratios to pick from, even if they are closely spaced. why would you need a 21 speed bike?

Maybe it is 5 forward gears and 5 rearward gears for dual threat street and stunt racing!

What is the expected number of OD gears in this 10-spd?

How many OD gears does the mercedees 8-spd have?

A lot of these mega-speed trans never see the higher gears, I'll bet (except on de-acceleration).

Just too many....

lets fill the entire space between flywheel to differential with a transmission!!!

j/k

I had a three speed with a console shifter, banana seat, chopper handlebars and a bitchin' coaster brake. I was happy.

My fathers avalanche with a 6-spd automatic only goes to fifth in town it seems like so i can't really imagine another four gears

^ Right- my brother's Allison 1000 6-spd barely shifts into 6th unless coasting on level super highways or long de-accelerations.

lets fill the entire space between flywheel to differential with a transmission!!!

j/k

Boy just think of the cost of rebuilding it and how long it would take, probably at least 2 if not 3 people working on a tranny the length of the auto