It is getting more and more likely that the next generation Porsche 718
will be converted to electric power. That is why the company's GT
department has taken the last chance to create the ultimate 718: Cayman
GT4 RS. This car is not just a GT4 added with racy wings and rock-hard
suspension, but it is a range-topping Cayman we have been always
dreaming of: a car no longer held back to avoid stealing sales from
911 GT3 or GT3 RS. It is the best the GT department can do with
existing parts bin.
The biggest news is the adoption of the latest GT3 engine - yes, that
9000
rpm motor! Although the longer exhaust on the mid-engined machine
knocks back its output a little, it still produces 500 horsepower at
8400 rpm and 332 pound-foot of torque at 6750 rpm. That's just 10hp and
15 lbft shy of the GT3. Moreover, the GT4 RS is 20kg lighter than the
GT3, that's why it takes an identical 3.3 seconds to go from 0-60 mph.
0-100 mph and 0-124 mph take 7.1 and 10.9 seconds, respectively, while
top speed is just 2 mph below its bigger brother, at 196 mph. All these
figures are associated with 7-speed PDK gearbox, because manual
transmission won't be offered.
As for Nurburgring lap time, it is equally outstanding. It lapped the
old 20.6km course in 7:04.5, 23.6 seconds less than the Cayman GT4. The
new layout of 20.8km was done in 7:09.3. Porsche did not mention on
what tires these lap times were achieved though.
The racing-inspired aerodynamic package of GT4 RS includes a larger
front splitter and swan-necked rear wing, both are manually adjustable
for track use. As in the GT3, the swan-necked rear wing leaves a smooth
underside to enhance downforce. Porsche said in maximum angle, the car
produces 25 percent more downforce than the GT4. Other aero
modifications include the lourvered vents on front fenders and a pair
of NACA ducts on front bonnet for cooling the brakes. At the sides, the
rear quarter windows are replaced with an extra intake for engine
breathing, leaving the existing side intakes for purely engine cooling.
According to Porsche, these extra inakes create more noises to thrill
the driver, too.
At 1415kg DIN, the GT4 RS is 35kg lighter than the GT4 equipped with
PDK gearbox. Weight reduction is achieved with carbon-fiber bonnet,
front fenders, rear wing and racing buckets, lighter rear glass screen,
reduced sound insulation, lightweight carpets, fabric door pulls and
single-lock aluminum wheels (wheel and tire sizes are unchanged from
the GT4 though). Optional Weissach package adds titanium exhaust and
roll cage, but PCCB brakes and magnesium wheels (which cut 10kg) are
another cost options. The standard brakes are composites (steel discs
with aluminum bells). Compared with GT4, the front brakes have been
enlarged from 380 to 408mm, clamped with 6-piston calipers.
The suspension of GT4 already got 30mm lower ride height and rigid ball
joints for some attachment points, but the RS spec. suspension turns
all points to ball joints and added helper springs front and rear. Its
ride height, camber, track width and anti-roll bars are all adjustable
for track use. A 30mm front axle lift mechanism is added for the first
time. PASM adaptive dampers are standard.
Another thing the RS has improved on the GT4 is gearbox. While the GT4
is criticised for having too long gearing, especially manual, the
7-speed PDK box on RS has shortened the ratios. Top speed is now
reached at top gear.
The differential remains to be a mechanical type, as there is no space
to fit an active differential. Torque vectoring is still managed by
brakes.
A lot faster, louder, sharper to drive and more capable on track, so
what is not to like? This is the first entry-level Porsche sports car
associated with a 6-figure price tag. It starts at £108,000, or
£32K
more than the GT4, even though a new GT3 will charge another £20K.