Yesterday I received the summer edition of "Mercedes" mag sent out by MB
From Sep there's going to be a radical new automatic gearbox with seven
forward gears and two reverse! Name: 7G-Tronic.
The higher-ratio of the reverse gears is to reduce wheelspin in winter mode.
I guess in mild southern England we would use the feature about once in 3
Another innovation is the casing, made of magnesium to keep the weight down.
First cars to get it will be S, CL, SL (no surprises here) and the
E-Classes, excl AMG.
I wonder who invented/developed it. Entirely Merc in-house?
NB: To reply directly replace "nospam" with "schmetterling"
Nothing innovative there. Magnesium gearbox casings have been around since
"From as long as I can remember until the early 1990s, Formula 1 gearbox
cases were made in cast magnesium." - http://www.grandprix.com/ft/ftpw017.html
I also remember reading that the Aston Martin DB4GT Zagato (or at least
a few individual vehicles) had a magnesium-cased gearbox.
"I have personally felt like I was living in a Ken MacLeod future since
sometime not long after 9/11, and I wish he'd CUT IT OUT." - P. Nielsen Hayden
I thought taking racing developments and bringing them to mass
produced cars was innovative myself, by definition its something new,
and contrary to established customs.
Can't say I've ever had a problem retaining traction in reverse,
still, I'm sure its going to be good fun sorting it out when it all
goes wrong :-/
Stunt drivers may get the most use out of it.
Why are transmission repairs so much
more aggravation and cost than what seems
like any other part of the car?
Why is AMG not getting the 7 speed? It seems
to me that if you are going to spring for the
hot AMG version you would want the best
transmission and those extra gears would
seem to be of more use too with the extra power.
Well, developments trickling down from racing cars is less innovation
than it's business as usual IMO. That's the way it's always been done.
And there's no way I'll call it an innovation when it was used more
than 40 years ago and is probably of pre-war origin. (Like everything
else on cars, magnesium casings were probably used by aircraft
manufacturers to keep weight down.)
Try half-molten snow on a layer of ice with an old S-class wearing
studless winter tyres. Wheelspin in any gear, no traction whatsoever.
Good studded tyres and weighing down the back end will probably help.
(And where can I get me one of those limited slip differentials...)
Aye, there's that. I'll keep my 5-speed manual, thanks.
"The collapse of the lighthouse [of Alexandria] must have been
astonishing, like watching the World Trade Center fall over."
Just because that's how it always happens doesn't mean it isn't
At present you cannot buy a mass produced vehicle with a magnesium
gearbox casing, in a few months you will be able to. Mercedes are
offering you the opportunity to own a vehicle with a feature like
this, which until now you would only have seen on a race track, that's
Not something that happens often in good old Blighty, what's a studded
I'm with you on this one, doesn't mean I'll get out of fixing someone
elses though... :-/
Unless you are in Mexico (Where you can buy one now), but the Volkswagen
Beetle uses a Magnesium case for the engine and transaxel. It has since the
first one in the 40's. We used a welding torch to light one once. Was a
bear to get started, but burned on it's own...
Some classmates of mine in a chemistry class one relayed that when they
go riding in their dune buggies at night they bring along an old VW
engine, shave pieces off, and light them for some midnight riding.
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