Sports cars are usually about great handling, light weight, and,
generally, selfish proportions. They're not about needs and
practicality. Rear seats, let alone rear doors, add power-sapping,
balance-mucking heft. No matter, Mazda will give the four-door
sports-car concept a go with its new, rotary-powered RX-8.
The
RX-8 rear-seat area has enough leg and elbow room for a trip to an
out-of-the-way restaurant, although headroom is a bit tight. Its
framed, pillar-free doors offer a big opening, like those of a Saturn
Ion, although the RX-8's thick door frames break up clean, muscular
lines. At 2933 pounds, this car weighs about the same as the last RX-7;
an innovative and light "virtual center pillar" adds safety. Steel
pipes under the aluminum skin of the rear doors connect to a brace via
strong door latches. Catchpins in the front and rear doors help pass
side impact to the underbody. With a high-backbone frame and a stiff
chassis, the automaker expects top crash-test ratings in all world
markets, while the rear doors give Mazda a unique feature it believes
necessary to carve a niche in a crowded sports-car market.
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Renesis is the name for the
latest version of Mazda's trademark Wankel rotary engine, pegged at 250
horsepower in the six-speed manual RX-8.
Mazda also developed a new Wankel rotary engine, dubbed the Renesis,
with improved emission and fuel-economy levels. The biggest change from
the old RX-7 rotary to the Renesis is the relocation of the exhaust
ports to the side of each rotor chamber. The old rotary's exhaust ports
overlapped the intake port opening, making it difficult to burn exhaust
that snuck into the intake. The Renesis has no such overlap, so the
fuel-cycle's air is clean and the intake exhaust is carried to the next
process and reburned. Mazda says this means less fuel consumption for
about the same power as the old turbo RX-7: an estimated 250 horsepower
in the six-speed manual version. The four-speed automatic gets a
slightly detuned, 210-horsepower Renesis. Mazda predicts an EPA
fuel-economy rating of 18-19 mpg city and 23-24 highway.
The RX-8's suspension is fairly sophisticated, but uses more steel
than aluminum. The 210-horse automatic version comes standard with
16-inch wheels and tires suspended by double wishbones. The sport
suspension, standard with the 250-horsepower stick-shift model,
stiffens the shocks and springs and upgrades the rolling stock to 18
inches. New electronic power rack-and-pinion steering is light and
precise, but lacks feedback compared to mechanical rack-and-pinion
systems.
While Mazda says its target is better ride comfort and less body
movement compared to the Honda S2000 and its own RX-7, the RX-8 may not
be as knife-edge sharp and sports-car purposeful as the new Nissan
350Z. Through the tight esses of the 2.1-mile Miyoshi Proving Ground's
Global Circuit, the RX-8 prototype we drove demonstrated mild initial
understeer and moderate body roll. Slalom through quickly enough, and
the outside rear tire hunkers down as the tail slides slightly (our
sample car didn't have the optional stability control). It reminds us
of the first RX-7 with its controllable power-throttle oversteer and
50-50 weight distribution.
2004 Mazda RX-8
WHAT'S HOT
· Balanced, easy to drive fast
· Comfortable and competent on rough roads
· Return of the rotary
WHAT'S NOT
· Lack of torque
· Lack of edge, at least in base form
· Four-door sports car: Future or fad?
The RX-8 is comfortable and stable over bumpy surfaces. And it's a
quiet chassis, with only the turbine-like whine of the rotary at high
revs to remind you of its sporting purpose.
The Renesis sits 1.6 inches lower and 5.5 farther back behind the
front wheels, compared with the last front mid-engine RX-7, for better
balance and yaw inertia. If we have one early observation, it's that
the RX-8 is no torque-monster, especially at the lower end. But its
nicely balanced handling, combined with an engine that winds up evenly
to its 9000-rpm redline, make the RX-8 is an easy sports car to drive.
If you've been behind the wheel of a first-gen RX-7, you'll feel at
home.
How much quicker, faster, and more exciting would a two-seat version
be? If Mazda brass decides that the RX-8 is a success, it could approve
a new RX-7 two-seater for '06. The car on the drawing boards will have
a wheelbase 11.8 inches shorter, weigh 330 pounds less than the RX-8,
and get a significant bump to 280 or 300 horsepower. Styled with a low
hoodline, it'll be either a conventional coupe or a retractable
hardtop. Stay tuned.
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