2007 Mazda Mazdaspeed3 - 263 Reasons Why

WE'RE FEELING DISI
First, Mazda gave us the Wankel, and now the DISI. The MZR 2.3-liter DISI (Direct Injection Spark Ignition) is available in the Mazdaspeed3 (263hp), Mazdaspeed6 (274hp) and CX-7 SUV (244hp). The intercooled turbo MZR gets all the bells and whistles including DOHC and four valves per cylinder, but the star of the show is the direct injection system.

A standard fuel injector sprays about 40psi of atomized fuel droplets into the intake manifold, but the DISI cranks that up to 1,600psi and directly injects the fuel into the cylinders. This cools the intake charge, raises its density, and reduces detonation. Direct injection also enables a higher compression ratio and allows more boost for the turbo. Another benefit is a faster cat light-off which reduces emissions.

Are we done yet? Not even remotely! The DISI in conjunction with its drive-by-wire throttle allows for precise control of the engine's speed and load, improving fuel mileage. Years from now, will we speak of the DISI in the same reverential tone reserved for the Wankel? Our Magic Eight-Ball says yes!

THAT NEW CAR SMELL'07 Mazdaspeed3

THE STICKER $22,240 (Sport); $23,955 (Grand Touring)

UNDER THE HOOD 2.3L DOHC 16v four cylinder turbo

THE POWER 263 hp @ 5500 rpm, 280 lb-ft @ 3000 rpm

SCALE TIPPING 3,153 lb

LAYOUT front-engine FWD

GEARBOX six-speed manual transmission

STIFF STUFF front: Independent MacPherson strut; rear: Independent, multi-link E-type; telescopic double-acting shocks, coil springs and stabilizer bars

ROLLERS 18x7.0 wheels; 215/45R18 Bridgestone RE050A tires

STOPPERS Power-assist ABS with EBD; 12.6-inch ventilated front and 11.0-inch solid rear discs

AT THE PUMP EPA 20 mpg city, 28 mpg highway

THE PACK Audi A3 3.2, Chevy Cobalt SS, Subaru Impreza WRX, Volkswagen GTI

DEEP THOUGHTS This car has no competition right now. It could stand to lose a few pounds and it will be interesting to see if the aftermarket can coax more power from the DISI while still retaining the torque management system.

By Nads

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