The Q45 looks like a thoroughbred. But what about its performance? Not to worry. Infiniti's 4.1-liter engine generates 266 horsepower and 278 foot-pounds of torque. This engine gives the Q45 stellar performance. It is based on the same powerplant as the Infiniti Indy V8 used in the Indy Racing League cars. The engine has variable valve timing, which adjusts valve opening and closing according to engine speed and load. Variable valve timing is a key element in the engine's efficiency. It's a proven technology and is a big plus.
Although peak torque is at a relatively high 4000 rpm, there is usable torque low in the power range and that means better low-speed acceleration. There's lots of power here. The Q45 accelerates from 0-60 mph in the mid 7-second range. That's quick. It also delivers responsible fuel economy, netting an EPA rating of 17 mpg City/ 24 mpg Highway.
The V8 drives the rear wheels through a four-speed automatic transmission and viscous limited-slip differential with traction control.
The MacPherson strut front suspension was designed to provide good handling without compromising on that luxury car feel.
In the rear, the Q45 has a multi-link arrangement designed to keep more tire contact patch on the road, and more patch means more grip. Anti-dive and anti-squat characteristics mean improved grip under hard braking and acceleration.
The Q45t (Touring Package) has a slightly more aggressive suspension tune for a sportier feel. Next Page