One element of the original LS 400 that did need improvement was its relatively confined rear-seat area. That was one of the reasons for the wheelbase stretch, as well as a small reduction in trunk capacity. The result is an extra 2.6 in. of rear-seat legroom, which elevates the rear quarters from snug to roomy.
Lexus has also come up with something new in the seating department. Instead of your ordinary wire springs, the new seats have a system of coil springs, little torsion bars and stabilizer bars, not unlike the car's suspension system.
The idea is to improve comfort and help the seat cushion resist deformation during hard cornering, and Toyota has patented the system. This may seem like a complicated way of achieving the goal, but it works, it doesn't add weight and it's typical of the kind of inventive engineering that's gone into this car.
Here's another example: The dual automatic climate-control system is 25 percent more compact than before, but also has increased capacity.
And another: The optional 6-disc CD changer is mounted in the dashboard - a first - above the glove box, which is bigger than the old glove box, and there's still room for the passenger-side airbag.
Other interior elements that we loved in the original are unchanged: the spiffy wood trim and the outstanding backlit primary instruments, which we think are the most attractive in the industry.
The LS 400 isn't a Volvo, but its safety credentials measure up as contemporary: dual airbags, a side-impact system that meets 1997 federal standards, enlarged front and rear crumple zones to absorb impact energy, front seat-belt pretensioners, 3-point seat belts at all five seating positions and a new collapsible steering column that has earned Toyota yet another patent.
Something that has not changed is the LS 400's extensive inventory of luxury features. Take a look at the specs. It's clear that there's nothing basic about the basic LS 400.
We do have one quibble with the interior: Trunk space has been whittled down to 13.9 cu. ft., which is not much more than what's offered in the Ford Contour.
Driving the LS 400 on a racetrack, in addition to a wide assortment of public roads, generated several strong impressions, all of them positive.
First, the new LS 400's performance is distinctly stronger than the original. Engineers have mined 10 more hp and 10 more lb.-ft. of torque from the silky 4.0-liter aluminum V8 engine, simultaneously reducing the engine's mass.
In fact, although the wheelbase is longer and the chassis has been stiffened, the entire vehicle is 209 lb. lighter than its predecessor.
This adds up to impressive acceleration. Lexus engineers claim a 0-to-60 mph time of about 7 seconds, which may be a trifle optimistic. On the other hand, even if the acceleration isn't quite that vigorous, it's clearly quicker than the previous car, which wasn't exactly sluggish.
And it's also more fuel efficient, by one mpg in the city and two on the highway, which means it continues to escape the gas-guzzler category.
A longer wheelbase and suspension refinements add up to better ride and handling, although here the distinctions are more subtle. The responses of the new LS 400 in racetrack handling maneuvers are a little more decisive, and its steering feel is a little more positive. The optional air suspension is also more responsive, thanks to extensive software improvements in the computer that governs the system.
We'd give the edge to the standard suspension for absolute handling, but the air-spring setup provides the better ride - better, in fact, than just about any car in this class.
All things considered, the LS 400 still isn't a sport sedan in the BMW sense. But that wasn't the objective. The objective was excellent handling combined with comfort, and that's exactly what the new LS 400 delivers.
It also delivers exceptional braking performance. Anti-lock is standard, of course. That's true of virtually all luxury cars today. But Toyota also improved the power and efficiency of the system. Better brakes in a lighter car yield better stopping, and considering the excellence of the original system, that's impressive.