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Old 12-31-2009, 01:00 PM   #1 (permalink)
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ZF ecomods a transmission: 8 spd auto, EOC-able, multiple input options, fewer parts

Found this Car & Driver article interesting:



It's an interesting modular approach to making one transmission case that can be customized with multiple options, including input from (A) a "regular" torque converter, (B) an electric motor (for hybrid applications) or (C) a multiple clutch pack for increased efficiency & shifting speed (better acceleration).

Quote:
ZF says the 8HP is six percent more *efficient than the outgoing sixer and nearly as efficient as a dual-clutch automated manual, which ZF also produces. However, the eight-speed is roughly 20 percent cheaper and retains the smooth, torque-converter starts to which U.S. buyers have become accustomed.
And interesting for those who like to practise engine-off coasting with automatic transmissions...

Quote:
Furthermore, the 8HP has a system to maintain hydraulic pressure even when the engine isnít running and is therefore the first automatic thatís compatible with stop-start operationógood for 11 percent better fuel efficiency, says ZF.
More info at: ZF?s 8-Speed Automatic Transmission - Tech Dept. - Auto Reviews - Car and Driver

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Old 12-31-2009, 06:50 PM   #2 (permalink)
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With the clutch pack or electric motor: A fine idea.

With the torque converter: Overpriced trash.

Torque converters are the tool of OPEC.
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Old 12-31-2009, 08:41 PM   #3 (permalink)
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Since the torque converter locks at 1200 RPM, it may not be that bad. :shrug:
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Old 12-31-2009, 09:08 PM   #4 (permalink)
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Impressive.
So the suppliers are ready with parts that are FE for the bigger vehicles......
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Old 12-31-2009, 11:32 PM   #5 (permalink)
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they are commited and involved

have you seen the under side of relatively newer european car ?
they are ready , they are involved , they are living it now.



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Impressive.
So the suppliers are ready with parts that are FE for the bigger vehicles......
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Old 01-02-2010, 12:02 PM   #6 (permalink)
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Quote:
Originally Posted by Mustang Dave View Post
Since the torque converter locks at 1200 RPM, it may not be that bad. :shrug:
I noticed that as well. Still not ideal, but if the US market generally demands slushy transitions in their beloved automatic transmissions, at least companies are trying to accomodate that with increasing efficiency.

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Ecodriving test:
Manual vs. automatic transmission MPG showdown



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has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
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