
20 Aug, 2023
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Mercedes-AMG
GT becomes a hardtop SL
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Put it simply, the second generation AMG GT becomes virtually the
hardtop variant of SL, although their styling differ. We have expected
this happening since the debut of the new SL, but their high level of
commonality still catches us a surprise. The GT shares everything
mechanical with the roadster: powertrains, suspension, chassis as well
as interior, which gets +2 seats for the first time. It shares the
roadster's 2700 mm wheelbase, while overall length is just a couple of
centimeters longer. At 4730mm long, it is a full size larger than the
old car, and this reflects on scale, i.e. an alarming 1895 kg DIN, a
figure it shares with the SL again.
As for styling, the front end keeps the genes of the first generation
GT, while the tail is a copycat of 911. In addition to the +2 seat, AMG
makes no secret that it wants the GT to be seen as the front-engined
equivalent of 911.
The car employs active aerodynamic aids, comprising of an active rear
spoiler, active shutter grilles and a movable flap located at the front
underbody. The latter can be lowered by 40mm at speed to activate
ground
effect.
Like SL, the GT offers a pair of 4-liter twin-turbo V8 for customers to
choose from. In GT 55, it produces 476 hp, good for 183 mph and 0-60 in
3.8 seconds. In GT 63 form, these numbers are lifted to 585 hp, 196 mph
and 3.1 seconds. Except the last one, all these figures are identical
to its SL sibling.
Needless to say, the coupe shares the roadster's 9-speed MCT gearbox,
4matic+ all-wheel-drive system, adaptive dampers, active rear-wheel
steering and electronic LSD. Ditto the hydraulically interconnected
suspension called "Active Ride Control" that replaces conventional
anti-roll bars.
Inside, the dashboard, console, tunnel, door cards and all technology
are shared with the SL. The rear seats are just as tiny, suitable to
only small children or luggage. Speaking of luggage, it is probably the
biggest improvement from the old car. Boot volume is almost doubled to
321 liters, and it can be extended further to 675 liters with the rear
seats folded.
Mercedes is expected to price the GT 55 at £150,000 and GT 63 at
£180,000, the same as what Porsche charges for the 911 Turbo and
Turbo S. However, the Porsches are not only more powerful (580 and 650
hp) but 255 kg lighter, far quicker in acceleration (0-60 in 2.6 and
2.7 sec) and faster in top speed (199 and 205 mph), and almost certain
to be better to drive. AMG seems like
committing suicide.
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18 Aug, 2023
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Ford
Mustang GTD
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GTD means diesel hot hatch to Volkswagen, but to Ford, it denotes the
most extreme Mustang ever appear on road. The story of its birth is not
unlike that of the outgoing Ford GT supercar. 2 years ago, Ford CEO Jim
Farley wants to build a Mustang that could smash the likes of Porsche
GT3 RS on track. A secret team of engineers and designers was set up at
a location isolated from other operations of Ford. Canadian engineering
firm Multimatic was chosen as partner for development as well as final
assembly, which is no surprise given that it did the same to the GT
supercar. Ford worked on the drawing board, provided its most powerful
engine available and many components from the Mustang's parts bin.
Multimatic developed an all-new chassis that uses only some basic
stampings from the Mustang's monocoque. No one knew about this project
until today, when Farley unveils it to the public.
Although the car has no relationship with the Mustang GT3 racing
program which was under development in parallel, Ford wants to
assoicate its image with racing success, so it chose the name GTD, i.e.
the IMSA equivalent of GT3 category.
Priced at $300,000, the GTD will be easily the most expensive Mustang
road car ever built, about 4 times as expensive as the Shelby GT500. It
has
specifications to back up, but scarcity it is not, because Ford wants
to sell up to 2,000 copies of it.
The GTD starts from the basic structure of Mustang, but almost
everything else have been replaced. All body panels bar the doors and
glass are bespoke carbon-fiber items. Fenders are widened massively as
the car is 100 mm wider overall. Extra vents are opened at the bonnet
and front fenders, GT3 RS-like. The rear fenders sports intakes like
mid-engined sports cars, which are used to cool the new transaxle (more
on that later). A huge rear wing is suspended by swan-neck arms, again
like GT3 RS, leaving a clean underside to optimize aerodynamic
efficiency. Big diffusers and carbon-fiber underbody adds further
downforce. The rear wing has an active element like Formula One's DRS,
while movable flaps at the front underbody can balance the rear
downforce.
The 5.2-liter supercharged V8 is developed from the GT500. On that car,
it produced 760 hp and 625 lbft of torque. Seems that development is
still on-going, Ford declines to offer any details, just confirms it
will make more than 800 horsepower and rev to higher than 7500 rpm. For
better track performance, the V8 is converted to dry-sump, but it is
not mounted any lower, disappointingly. It breathes through a titanium
exhaust.
The big news is the new transaxle. Until now, all Mustang road cars
have
their gearbox attached right behind the engine. The GTD goes so extreme
that it abandons this arrangement and opts for a new 8-speed
dual-clutch transaxle supplied by Tremec. Moreover, unlike other
transaxle applications on front-engined cars, it has the gearbox
mounted behind the rear axle, much like a mid-engined machine. This
increases polar moment of inertia, which is not good, but it helps
balancing the heavyweight V8 up front, as Ford struggles to meet its
weight distribution target of 50:50 (at the moment it has achieved
51:49, so more work has to be done). Official pictures show that the
front end of the transaxle is flat, implying it might be designed for
mid-engined applications but converted for Ford's use. The transaxle is
linked to the engine by a carbon-fiber driveshaft.
Mounted right above the gearbox is a subframe on which a sophsticated
suspension is mounted. This multi-link system employs push-rods to
operate inboard springs and dampers. The latter is Multimatic's own
DSSV, of course. As in the case of Ford GT supercar, the DSSV dampers
have the additional function of dual-ride height and dual-spring rate
adjustment. By switching to Track mode, the suspension will drop by
40mm and rest on stiffer springs. The front suspension is all-new, too,
a double-wishbone setup, also completed with DSSV dampers.
The GTD employs 20-inch wheels (aluminum or optional magnesium) and
shod with massive Michelin Cup 2 R tires: 325/30ZR20 up front and
345/30ZR20 at the rear. The former is definitely the widest we have
ever seen. Brakes are Brembo carbon-ceramic items, of course.
Strangely, no performance figures have been hinted at its launch,
except a Nurburgring lap time of under 7 minutes. That should place it
in the same sentence as some of the fatest Porsches and Lamborghinis,
if not for long. As production is slated for late 2024 or early 2025,
there is still a lot of work to do. No wonder so much information is
lacking.
The same goes for the interior, which is not revealed yet. All we know
is there will be flat panel display taken from the standard car and a
pair of Recaro buckets but absolutely no rear seats. The latter is not
only to save weight but also to work as cargo space. Why? Because the
boot is sacrificed for the transaxle and its cooling system. A pair of
fans and a heat exchanger are mounted at the boot lid for the job.
Wonder why not simply put the engine there, a la Clio V6.
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18 Aug, 2023
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Nissan
Skyline
Nismo
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Following Z, the Japanese market Skyline sedan also gets Nismo
treatment. The 3-liter twin-turbo V6 is boosted to 420 hp, but
strangely, it gets even more torque than the coupe, at 406 lbft from
2800-4400 rpm. 7-speed automatic is still the only transmission.
Besides, the Nismo gets stickier Dunlop SP Sport Maxx GT tires, better
brake pads, stiffer suspension tuning and specific skirts all round.
Not huge changes, since the car is already 10 years old.
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1 Aug, 2023
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Nissan Z
Nismo
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The Nismo version of Z is supposed to be designed for hardcore drivers,
but ridiculously, it ditches the manual gearbox which is available to
the regular Z and sticks with a 9-speed automatic. Yes, the automatic
might be actually quicker in acceleration, and this one is made quicker
still by a strengthened clutch pack that allows nearly 50 percent
quicker shift in the most aggressive mode, but still there is no
replacement to the joy of making gearshift yourself, isn't it?
The VR30DDTT engine is largely the same as standard, but its ECU is
remapped to allow higher boost pressure while cooling is improved and
ignition timing is revised, resulting in an extra 20 horsepower. Peak
power is now 420 hp, still released at 6400 rpm. Peak torque is
improved similarly, by 34 lbft to 384 lbft, released from 2000 to 5200
rpm. No performance figures have been said, but expect to take the low
4-second range to reach 60 mph.
Outside, the Nimso version gets deeper air dam and skirts to improve
both downforce and drag. The chassis gets extra bracings, but torsional
rigidity is lifted by merely 2.5 percent. The suspension gets stiffer
springs, dampers, roll bars and bushings. The front brakes are enlarged
from 355 to 380mm, while the higher performance calipers are made of
aluminum. The new forged alloy wheels are wider yet slightly lighter.
Dunlop SP Sport Maxx GT600 tires should offer more grip, especially as
the rear tires get 10mm wider.
Inside, the Nismo uses lighter and sportier Recaro buckets, but they
are manually adjustable. Otherwise, all creature comfort features have
been retained. We heard that the car is actually heavier than the
regular Z, so it is definitely not a hardcore track car.
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