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Thu Sep 26, 2002 3:02 pm
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Cosmic Creation Driving one of the most intriguing Japanese cars ever - the Eunos JC Cosmo 20B.
Words by Michael Knowling, Pix by Julian Edgar
Page 1 of 5Click on pics for larger images
The 20B twin-turbo triple-rotor is the motor every Wankel lover drools over - and from behind the wheel of a Eunos Cosmo it's easy to understand why. With no reciprocating mass, just three spinning rotors and two sequentially spinning turbos, the gangster-styled Cosmo thrusts forward as if somebody's strapped a jet turbine underneath. The mid-range is simply staggeringly good.
That Motor... Mazda went all-out with the development of the tripe-rotor twin-turbo. In addition to simply slapping another 654cc rotor chamber on the back of the 13B platform (bringing the capacity out to 2.0-litres), Mazda tested and tuned a complex sequential twin-turbo arrangement. With the primary turbo configured to give good throttle sensitivity and deliver boost from barely above idle, a secondary turbo chimes in to add manifold flow over about 4000 rpm. The end result is an engine that flexes some serious muscle from about 1800 rpm all the way to the 7000 rpm redline. Over 390Nm is available from around 2200 rpm and peak torque - a substantial 402Nm - arrives at 3500 rpm. A politically-correct 206kW is generated at 6500 rpm, though that figure is a bit rubbery - word is maximum power is closer to 220kW (when running on Japanese 100-octane fuel). Even during normal driving, when the throttle isn't fully open, the Cosmo's 'triple treat' still pushes out an awesome amount of torque. It feels like there's a monster big-cube engine lurking under the lid. And - unlike a current model Subaru Liberty B4 - it has the transitional turbo stage very well ironed out. There's no drop in torque while the second turbo is being phased into action.
Intended as a luxury sports coupe, the Cosmo comes with a standard triple-mode 4-speed automatic transmission. Shifts are positive and a handy 'Sport' mode - which locks out overdrive - ensures the engine is always ready-and-waiting to instantly deliver the goods. The rear-end reduces driveline rotational speed by a ratio of 3.909:1 and features a viscous limited slip centre - what else would you expect with an easy 206kW on tap? Despite having a standard automatic transmission and weighing between 1570 and 1640kg (depending on spec), the 20B Cosmo hauls its rump along very swiftly, thanks very much. After an initial hesitation off the line, the Cosmo can rip to 100 km/h in a brisling 6-ish seconds and cover the quarter in about 14.1 seconds. Terminal speed over the quarter is around 165-170 km/h - just shy of the Japanese-regulation 180 km/h speed limiter. Fuel consumption is likely to be equally rapid.
The very strong performance is a touch incongruous given the Cosmo's sedate lines. In fact, from some angles it almost looks a bit mid-Eighties 929 two-door. But it sure as hell doesn't go like an old 929....
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