Editorial: Thoughts On the Seven Speed Manual

Interesting | June 11th, 2012 by 6
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The folks at Bimmerpost uncovered BMW patent drawings that showed a seven speed manual shifter and shift functionality. What caught my attention was the notion …

The folks at Bimmerpost uncovered BMW patent drawings that showed a seven speed manual shifter and shift functionality. What caught my attention was the notion that BMW was developing a shifting mechanism that could physically prevent shifting into a lower gear that could over-rev the engine. That is a physical mechanism, not electronic. That could mean that the shifter is still a direct linkage to the gearbox and a clutch. (If you can row the gears through physical gates, why not retain the clutch. If you go to an electronic shifting mechanism, why retain the clutch.)

It is odd that the drawing shows the seventh gear at the right edge of the neutral gate (the neutral gate is more like the neutral line). I would have expected to see that as a leg off the neutral gate, much like the other six gears and reverse are. Currently Porsche offers a seven speed manual gearbox made by ZF. Don Sherman has a good technical writeup of the both the manual, and DPK versions of that gearbox here.

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The question is would BMW have two variants of a similar gearbox built? It would seem that the BMW may have access to the seven speed manual soon. The gearbox manufacturer normally assures the auto manufacturer partner for a new gearbox exclusive rights to use the gearbox for about eighteen months. The timing would be right. And BMW would differentiate their manual shifting version with the lockout feature to prevent catastrophic engine failure following the choice of a wrong gear.

So what do we know? The seven speed manual provided for Porsche by ZF is probably nearing the end of its exclusivity agreement. The Porsche gearbox is a longitudinal mount, even though the case and power routing are optimized for Porsche’s peculiar powerplant placement (sorry the alliteration was too alluring to pass up). BMW has the option of offering their current electronically (automated double clutch) seven speed version as well as a new, protected from over-revs, manual shifting variant.

The folks at M will tell you to get the double-clutch. Us diehard self-shifters will opt for the manual.

6 responses to “Editorial: Thoughts On the Seven Speed Manual”

  1. johnparke says:

    I just hope that the lock out feature isn’t too nannyish.

  2. LaMa says:

    7spd manual ? rubbish… all engines have enough torque not to need this.
    I personally don’t see a reason for 7spd manual. Too much work and shifting.
    in a DCT its oke, but its the maximum, on automatic nobody cares how many speeds are there…

    • Tom says:

      Depends on how the gearing is sorted out. The 7th is likely an overdrive to help highway fuel efficiency.

      • DSC OFF says:

        So whatever ratio they plan on for 7th, just make that 6th. Nobody is going to redline in 5th gear.

        • auaq says:

          Well, unfortunately there are idiots out there who like to redline in every gear and get all that jerky back and forth motion while in gear transition. I’m not sure what else are we going to achieve from a 7th gear other than fuel economy mode. I for one think that the 6th gear is pretty good enough but then again it is the EPA driving force behind all of this rather interesting subject I have to say!

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