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  #1  
Old 04-14-2008, 07:47 PM
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Arrow F01 7-series with 8-speed transmission

We were all happy with the 6 speed transmissions that appeared a few years back for performance and efficiency. Then MB released a 7 speed auto making the 6 speed look obsolete and BMW driverís green with envy.

This past year Lexus toted they had the worlds first 8 speed auto. This was an interesting development as BMW did not even have a 7 speed. The 8 speed Lexus offering is only available in the land yacht sized LS because it too (like the LS) is a bit too large for other models in the brandís line up. With the introduction of the next generation 7 series BMW will launch its first 8 speed gearbox.

In order to keep up with the Jonesí BMW has had to think a bit outside the box. Our sources indicate that the transmission BMW will utilize takes up the same amount of space as the current 6 speeds and will not use additional components. This has been made possible by a completely new transmission concept. We have learned that it utilizes four planetary gear sets and five transmission clutches. Two transmission clutches are unlocked per gear, thus resulting in greater efficiency and a higher overall transmission ratio.

It is touted as being smoother and will reduce fuel consumption by almost six percent; way to go Efficient Dynamics! Since it is the same size as the current 6 speeds, a larger hump or other invasions into the passenger cabin space is not necessary. The gear selector will also return to the console from its previous stalk location; a well welcomed change for many. BMW had explored other options but testing indicated that an 8 speed is the most efficient form of transmission because of the optimal use of gear ratios, weight and size. 9 and 10 speeds boxes actually showed a decrease in efficiency and additional size constraints.

This transmission is modular in design so it can be used in various applications. This will make it available for use in Hybrids and X-Drive vehicles, which the 7 Series will feature. This transmission should be available in all varieties that BMW will offer the 7 series in, allowing BMW to reduce costs associated with different drive-train combinations.
This transmission will make its debut in the F01 7 series to be followed later by the F10 5er.
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Old 04-14-2008, 09:33 PM
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Hopefully, BMW can make it work. Lexus couldn't make their 8-speed work in the LS, and it doesn't really suit the performance nature of the IS-F. And BMW can't make their GM 6AT work reliably in the E83. And driving the "base" automatic in the 325i/328i feels like taking a step back in terms of responsiveness compared to the outgoing 5AT.

How about a fancy, high-tech new manual gearbox, BMW?
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Old 04-15-2008, 12:43 AM
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You'll see the M DCT (the double-clutch tranmission) for the M3 coming out in the next month or so in the M3 coupe/convertible/sedan (in that order). The M DCT will be your high-tech new manual gearbox...



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Originally Posted by AzNMpower32
Hopefully, BMW can make it work. Lexus couldn't make their 8-speed work in the LS, and it doesn't really suit the performance nature of the IS-F. And BMW can't make their GM 6AT work reliably in the E83. And driving the "base" automatic in the 325i/328i feels like taking a step back in terms of responsiveness compared to the outgoing 5AT.

How about a fancy, high-tech new manual gearbox, BMW?
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Old 04-16-2008, 12:32 PM
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Quote:
Originally Posted by Kewl X5
You'll see the M DCT (the double-clutch tranmission) for the M3 coming out in the next month or so in the M3 coupe/convertible/sedan (in that order). The M DCT will be your high-tech new manual gearbox...
No, like, manual with 3 pedals in the traditional sense. I see DCT as a replacement for SMG. I dunno, I know there isn't much you can do to a manual gearbox, but perhaps they could shorten the shift throw a tad?
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Old 04-16-2008, 02:58 PM
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Lets hope they addressed reliability in this slushbox and that it doesn't search for gears all the time.
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Old 04-16-2008, 03:27 PM
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at this rate of "keeping up with the Joneses", I guess it's only a matter of time before we'll see 1000hp 15 speed cars in our driveways. Imagine the entry level 1-series having only 500hp.
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Old 04-16-2008, 04:54 PM
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mmmm....overdrive-happy...
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Old 04-16-2008, 10:59 PM
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Quote:
Originally Posted by x5GuyInLA
at this rate of "keeping up with the Joneses", I guess it's only a matter of time before we'll see 1000hp 15 speed cars in our driveways. Imagine the entry level 1-series having only 500hp.
I wonder what the fuel consumption on that will be. I'm guessing it's easier to engineer a motor that produces more power given the same amount of fuel consumption, than a motor that produces similar power but consumes much less fuel. Like, a lot less fuel, not just marginal amounts like the M54 -> N52 engine.
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Old 04-16-2008, 11:20 PM
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I'd rather have a 6sp auto then an 8sp...this is getting ridiculous ....
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Old 04-16-2008, 11:34 PM
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Quote:
Originally Posted by AzNMpower32
I wonder what the fuel consumption on that will be. I'm guessing it's easier to engineer a motor that produces more power given the same amount of fuel consumption, than a motor that produces similar power but consumes much less fuel. Like, a lot less fuel, not just marginal amounts like the M54 -> N52 engine.
I haven't the slightest idea, but I'm guessing it won't be that much different. I remember back in the 90s, GMC had the 4-speed V6 turbo Typhoon that had only 280hp and could go 0-60 in about 5 seconds. Granted the gearing was different, but I don't think the fuel consumption is any worse than the 6,7,8-speed, 400-500hp beasts we have today that have about the same acceleration.
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