The Basics Remain, But...

The "Lexus IS," which debuted in 2005 with the opening of Lexus in Japan, will undergo a full model change in 2013. Ahead of its world debut at the "Detroit Motor Show" in January, we were able to test drive its prototype in LA in November, and here is our report.

At the closed course in the suburbs of LA, the "IS Prototype" was covered in a swirling camouflage that concealed all exterior details. While not all vehicle details were revealed, the body dimensions are stated as: overall length 4,660mm (75mm increase from current model) x overall width 1,812mm (12mm increase) x overall height 1,430mm (unchanged), with a wheelbase increased by 70mm to 2,800mm. While the basic wedge-shaped form with a compact cabin has been retained, a closer look reveals a remarkably bold design around the headlamps.



The interior, on the other hand, has been completely redesigned, with the dashboard adopting a horizontal design common to the latest Lexus models.

Overall, it presents a more subdued impression. However, looking at the instrument panel, it incorporates theLFA"F Meter" inherited from the LFA, significantly enhancing the futuristic and sporty feel. As detailed later, this is an exclusive feature for the "F SPORT" model.

Not only in appearance but also in seating feel, the driving position has been dramatically improved with a 20mm lower seat position and a 3° more upright steering wheel angle. Furthermore, thanks to the increased size and thinner seatbacks, rear seat space has also become considerably more accommodating, with a 95mm increase in legroom.

However, the most significant focus is on the driving dynamics, as is the case with recent Lexus models. To this end, the new IS features a particularly reinforced body structure. Not only have the spot welding points been increased, but new production techniques such as laser screw welding, used in the LS, and the application of approximately 30 meters of adhesive along the joints have been actively introduced.

On the Rain-Soaked Course

The suspension is based on that of the new GS. The MacPherson strut front suspension features a 20% increase in stabilizer rigidity due to layout changes. The rear suspension geometry has been altered, including repositioning the toe control arm to the rear, and the dampers and springs are now mounted separately. The steering gear has also been revamped to enhance steering feel.

The powertrain lineup comprises three options. The entry-level "IS250" continues with the V6 2.5-liter direct-injection engine paired with a 6-speed automatic transmission. The "IS350" now features a V6 3.5-liter direct-injection engine coupled with a new 8-speed automatic transmission. Additionally, a new hybrid model, the "IS300h," will be offered, combining a 2.5-liter inline-4 direct-injection engine with an electric motor.

The test vehicles for this drive were all "F SPORT" specifications of these three powertrains. In addition to sporty interior and exterior styling, the test vehicles included AVS (Adaptive Variable Suspension) on the IS350 and IS300h, and VGRS (Variable Gear Ratio Steering) on the IS350.



First, we tested a slalom course with cones to confirm the basic characteristics. However, it was a fast course with high speeds, and the track conditions were challenging, transitioning from wet to semi-dry due to the rain.

Switching between this and the current model, which was prepared for comparison, we found that all three grades share an exceptionally refined ride quality. Specifically, the suspension moves smoothly on a rigid body, creating a supple ride. The smoothness of the rear suspension's movement, in particular, seems to greatly contribute to the rear seat comfort.

The steering feel is excellent, as intended by the development team, and the natural turn-in is pleasing. However, the sharpness of the turn after the initial turn-in feels slightly dulled. It's not that the front lacks grip, but rather the rear's tenacity feels more dominant. While the handling is agile, in the slippery areas where the tires lose grip, the movements are quick and can be unnerving compared to the current model, which offers significantly more composure. However, given the car's character, it might benefit from being slightly more eager to turn.

Sufficient Impact

While the powertrain of the IS250 remains largely unchanged, the acceleration feel is quite pleasant thanks to the sound generator utilizing air pulsations, which produces a pleasing engine note. The IS350 is, of course, more powerful overall, and the adoption of the 8-speed automatic transmission contributes to a crisp, modern driving sensation. Particularly in M mode, the quick response to throttle inputs can be fully enjoyed due to full lock-up in two or more gears and the blipping function.

As for the highly anticipated IS300h, its acceleration is remarkably smooth. While manual shifting can be simulated using the shift paddles, it fundamentally operates as an electronic CVT, offering moderate directness and sharpness. Instead, the D range, which has been refined to minimize the sensation of engine revs preceding acceleration, felt more responsive and controllable.

How Will It Be Refined Before Launch?

On winding roads, the smoothness of the turn-in is pleasant, and while it turns as expected when steered, the overall steering angle tends to be large. The development team acknowledges this. As the launch is still some time away, they plan to continue refining it, so we look forward to those improvements.

Furthermore, it's a shame that despite having a drive mode select system, the difference in suspension stiffness and overall feel between "NORMAL" and "SPORT" or "SPORT+" modes is not very significant. While comfort is good, it might be beneficial to offer a more engaging experience in "SPORT+" mode.



Interestingly, the IS300h felt like it had the best cornering balance. This is likely due to the hybrid battery being mounted at the rear of the vehicle, improving the front-to-rear weight distribution to nearly 50:50 from around 53:47 in other grades.

The new IS leaves a strong impression of increased overall refinement in its driving dynamics. On the other hand, both in terms of proportions and especially driving, there's a slight feeling that it might have become a bit too subdued. Considering its direct competitors, such as the classic

BMW 3 Series,as well as the newcomerCadillac ATS,which assert their presence aggressively and deliver high-level performance, we hope Lexus will push the final tuning to its limits.

While there are still some concerns, the driving excitement and quality have been enhanced, and it is equipped with the powerful and appealing weapon of hybrid technology. The new IS is undoubtedly a car that we look forward to experiencing in its fully mature form upon debut.