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Tue
Nov 13 2007

Five words for BMW

Matt Saunders

I’ve just been reading Greg Kable’s first impressions on driving the new BMW X6. It’s a bit of a revelation in the dynamic  department, it seems: agile, quick, fine-steering. And it owes a great deal of that handling prowess to the breakthrough active four-wheel drive system underneath it, which sends extra torque to the outside rear wheel when you’re cornering, giving you an additional turning moment to the one provided by the steering wheels.

Well, I’ve got news for you BMW; that’s not a breakthrough. Anyone who’s been driving around in the current Honda Legend (and I appreciate that there aren’t many of you) will have been experiencing such a system for a while now. Honda calls it Super Handling All-Wheel Drive. You’ll find it on half of Honda’s American Acura models as well as the UK Legend, and it’s rumoured to be favoured for application on the forthcoming Acura NSX replacement.

The pity is that Honda didn’t do as thorough a PR job with its SH-AWD system as BMW surely will with Dynamic Performance Control. The motoring media is likely to hail the latter a technological marvel over the coming months, forgetting all about the former.  But I’ll remember.

And while SH-AWD mightn’t be as ‘active’ or as ‘clever’ as PDC, and the sheen on it no longer as lustrous as it was, I’ll be sure to remind BMW that it was on the UK market fully two years before their system, should they start crowing about technological breakthroughs.

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About Matt Saunders

Career started in a mk III Jaguar that conveyed him home from the maternity ward. At Autocar since 2003, he says he's enjoyed every minute - especially the hairy ones.

Comments

hamishl November 13, 2007 3:20 PM

Having read the blog minutes ago, I thought the technological breakthrough was not that BMW's system directed drive to whichever wheel needed it most, but that it did it when on overrun, whereas most systems only do it when the driver accelerates.

hamishl November 13, 2007 3:21 PM

Sorry, that should have read "article", no blog, although both were true.

pitfield November 14, 2007 8:54 AM

Hmmm, how does it add torque on overrun. I'm lost.

Matt Saunders November 14, 2007 12:27 PM

I guess BMW means that, in the same way that PDC will channel torque to an outside rear wheel to combat understeer, it'll channel engine braking to the same wheel to help dial out lift-off oversteer.

Either way, the point is that most of its work is done on the throttle. Which is exactly the same in the Honda system.

srvracing December 4, 2007 10:58 PM

The Evo IX had a similar system that could multiply torque through a planetry gearset to it's rear wheels.

For the Evo X, the system has been upgraded to a S-AWC system like the BMW's and Honda's.

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