Douglas Fir wrote:

Paul

Here is someone thinking along our manner.

High comp. rotor,  small compressor. likes of power and yes its a RENESIS.
I'll try to get some more details.  Just imagine the turbo compound
potential.

>From this website>  http://rotarynews.com/?q=node/view/453
Mazda Australia today unveiled the first of its "extreme cars", a
turbocharged RX-8 Motorsport Concept, at the Australian International Motor
Show in Sydney.

The "extreme" RX-8, which was conceived by Mazda Australia?Äôs motor sport
manager Allan Horsley, is powered by a turbocharged and intercooled rotary
engine that is expected to develop about 270 kilowatts of power and close to
350Nm of torque.

The car also features 19-inch wheels and tyres, a high performance racing
brake package, retuned suspension and Mazdaspeed body kit parts for a more
aggressive look.

Mazda Australia?Äôs "extreme car" program was prompted by new managing
director, Doug Dickson.

"The idea of this program is to challenge our corporate imagination and in
this case we have developed a faster, more aggressive, motor sport version
of the RX-8", Dickson said.

"This one-off concept further demonstrates the strength, integrity and
ability of the production RX-8 because the fundamentals of this concept
remain true to the standard car".

Motor sport manager, Allan Horsley, said: "The RX-8 Motorsport Concept was a
must do challenge for us and thanks to the engineering sophistication of the
production car it all came together in just a few months.

"We plan to give some of the motoring media with racing experience the
opportunity to enjoy the fruits of our labour at a track day drive event".

Future Mazda "extreme car" projects will not necessarily focus on the
company?Äôs class-leading sports cars or on its award-winning passenger
models.

"The idea behind ?Äòextreme cars?Äô is not just added acceleration and all
that goes with that formula. An idea could involve any present Mazda model.

We have, for example, discussed an extreme B Series, that would showcase its
comfort, refinement and off-road ability", Dickson said.

The RX-8 Motorsport Concept makes its intentions known with an aggressive
looking Mazdaspeed nose with integrated spoiler and big air intake as well
as a large and adjustable Mazdaspeed rear wing.

Velocity Red mica metallic paint and attention grabbing white "GT stripes"
run along the car?Äôs sides, while bonnet flutes further hint at the car?Äôs
added performance and aid under bonnet cooling.

Riding on striking white-painted, 19x8-inch alloy wheels, the concept
features different tyre sizes front and rear. 235/35 tyres are used on the
front wheels and larger 255/35 tyres on the rear, helping deliver the
concept?Äôs prodigious power and torque to the road. The production RX-8
boasts 18x8 alloy wheels and 225/45 tyres.

A centre-mounted rotary-shaped brake lamp completes the strong visual
statement made by the RX-8 Motorsport Concept.

The car?Äôs revised suspension, which drops the ride height by 25mm,
improves the standard car?Äôs class leading dynamics and adds to the
concept?Äôs visual impact.

Suspension modifications focus on new specification, stiffer Eibach springs
that help improve the already impressive grip offered by the RX-8?Äôs
multi-link front and rear suspension.

The revised suspension settings, which help reduce body roll, further
sharpen responses from the car?Äôs electric-driven rack and pinion steering.

Promising considerably more power and torque than the standard car, the RX-8
Motorsport Concept features a Renesis rotary engine complete with

a water cooled Garret turbocharger running 7.5lbs of boost pressure and a
large air-to-air intercooler.

These modifications and a re-programmed Power Control Module that maximises
the engine?Äôs efficiency are expected to boost power by more than 52 per
cent over the production RX-8.

The engine?Äôs pulling power, or torque, receives a substantial boost over a
wide rev band, with it peaking about 350Nm, an increase of almost 65 per
cent over the road car.

Using a relatively small and low-boost turbo ensures good throttle response
and maintains the free-revving nature of the road car?Äôs normally aspirated
rotary engine.

The RX-8 Motorsport Concept?Äôs compression ratio and redline are
unaffected, allowing the turbo engine to race to 9000rpm.

A larger, free-breathing exhaust system ensures maximum power gain while a
new muffler also aids breathing and delivers a throatier, more purposeful
exhaust note.

Braking is by an Alcon six piston racing system that features 335mm vented
and grooved discs. Similar systems are used in world rally, Japanese GT, V8
Supercar and NASCAR racing.

Other mechanical upgrades include a smaller but more powerful battery, while
a larger core radiator ensures the engine runs within its ideal temperature
range under all conditions.

The RX-8 Motorsport Concept shares Mazda's new-look Australian International
Motor Show stand with the Ibuki near future concept roadster, which was
unveiled at the Tokyo Motor Show last year. Mazda will also showcase its
full range of new generation cars - the Mazda2, Mazda3 and Mazda6.

The Australian International Motor Show at Darling Harbour, Sydney, opens
its doors from October 7 to October 17.

Doug

Yes I think I read that in RX Tuner magazine. Then it blew up :)
Compression ratio too high for the boost. Also some of the racers
running RX8 rotors in older engines are machining out the apex seals
slots for more robust 3 mm versions. I have friend in Florida running RX8
rotors in his RX7 racing car.

I have contacted my contact at Mazda Corp Japan and suggested they make
some low compression rotors for the RX8 to be sold through Mazda Speed.
Maybe that will happen and all these guys trying to supercharge or turbo charge
the RX8 motor will have better luck.

Paul Lamar
 
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