A 10-speed DSG gearbox is among the technology being developed by Volkswagen, the firm's boss reveals
Mark Tisshaw
26 April 2013

A 10-speed dual-clutch automatic gearbox is being developed by the Volkswagen Group. Speaking at the Vienna Motor Symposium, VW Group chief Martin Winterkorn also confirmed a high-performance diesel engine with 134bhp per litre was in the works.

The 10spd DSG transmission is in response to strict upcoming CO2 emission rating legislation, which will force manufacturers to lower average fleet CO2 emissions to 95g/km by 2020.

The diesel engine will feature “variable valve-train assembly, a high-pressure injection system at up to 3,000 bar and combined charging with the innovative e-booster [an electric turbocharger]”.

Winterkorn said he believes that petrol and diesel internal combustion engines could be made 15 per cent more efficient due to improvements in the combustion process, lightweight design and improved friction levels and thermal management.

VW is also keen to push natural gas technology, which Winterkorn believes “is environmentally friendly, economical and suitable for everyday use”.

He added. “The technology is fully developed and the vehicles are already on the market. We need to make the public even more aware of the benefits of natural gas engines. Everyone needs to play their part in this: car makers, politicians and the fuel industry.”

Plug-in technology remains the best and most efficient powertrain option for the medium-term, according to Winterkorn. 

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22

26 April 2013

About bloody time too! I've been crying out for a 10 speed box.

 

26 April 2013

How silly.......why not a 20 speed?

27 April 2013

It's written as if us readers already know that a 10 speed gearbox will be much more efficient than a 6 speed.

But please tell me, why is a 10 speed using less petrol?

 

28 April 2013

supertax wrote:

It's written as if us readers already know that a 10 speed gearbox will be much more efficient than a 6 speed.

But please tell me, why is a 10 speed using less petrol?

 

I think its because combustion engines are at their most efficient through a narrow range of revs for a given engine loading / vehicle speed.  The more you can stay in this range, the better.  8 speed autos in BMW's are more fuel efficient than their manual 6 speed counterparts, despite auto technology being inherently less fuel efficient because the additional gears allow the engine to remain longer in its efficient sweetspot.  Petrol range extenders of electric hybrid cars go one step further and run constantly in a narrow rev range, also at their efficiency sweetspot.  I think accelerating an engine uses much more fuel than running it constantly also.  The more gears (upto a point) the better!  

Say an engine is most efficient running constantly at 3500rpm.  With 6 gears, if you change up a gear, the engine may have to drop down to 2500rpm and then accelerate back up to 3500rpm.  With 10 gears, it may only have to drop down to 3100rpm when you change up.  Imagine this happening again and again.  The 10 speed box will be able to keep the car at its most efficient point through a much wider range of speeds than a 6 speed box.

Or say for a given engine load and vehicle speed, 2800rpm is the most efficient point.  Obviously a 10 speed box is more likely to have a gear ratio on hand to match this point than a 6 speed box.

I read this in various car mags over the years, so am not sure how accurate the info is.  Car mags arent exactly written by engineers!

28 April 2013

winniethewoo wrote:

supertax wrote:

It's written as if us readers already know that a 10 speed gearbox will be much more efficient than a 6 speed.

But please tell me, why is a 10 speed using less petrol?

 

 not sure how accurate the info is.  Car mags arent exactly written by engineers!

Alas no (I'm not an engineer either!)

27 April 2013

then surely a CVT gearbox is the most efficient. But every driver knows a CVT is the least rewarding gearbox of all to use. Ten gears must weigh more than six, too. The engine sounds more promising, though.

27 April 2013

And land the owner with a large bill.

27 April 2013

Modern gearboxes are known to be getting weaker as they squeeze more gears into a narrow space. So what's a 10 speed going to be like?

27 April 2013

Thought this would have the romantics out in force bemoaning progress again. The wife's XF has a lovely six speeder. My newer BMW has an eight speed box and it's quite brilliant; smoother and more economical.

As material technologies and electronics improve so gearboxes can have more gears for better performance and efficiency. Or perhaps we should go back to three-speed crash gearboxes, wind-up windows, direct steering and lead in petrol.

27 April 2013

If the device is sorted properly before release then it could be argued as progress. However there have been too many instances in recent years where the customer has been expected to carry out the development work. If there are any real benefits accruing from the additional complication (and consequent added expense) then whoopee. Otherwise don't!

No -one is suggesting that  we go around in side valve Fords or aircooled VW's for that matter.

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