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Showing posts with label 2008 Lexus IS-F. Show all posts
Showing posts with label 2008 Lexus IS-F. Show all posts

2008 Lexus IS F Review

The letter F is an auspicious one in Lexus lore. Back in the mid-'80s, when the Lexus brand was still in the planning stages, Toyota insiders referred to the prospective luxury division as "Circle F." And the car that put Lexus on the map, the LS 400, was known internally as Flagship One, or F1. For 2008, the letter F is back: The company has decided to crash the über-sport sedan party with the 2008 Lexus IS-F, a hard-edged performance car based on the IS-series sedan and aimed squarely at perennial magazine-cover fodder like the Audi RS4, BMW M3 and Mercedes-Benz C63 AMG.

2008 Lexus IS F-12008 Lexus IS F-2The IS-F marks the official launch of Lexus' F line, and it's akin to the aforementioned competitors' in-house performance divisions. As such, Lexus has gone to great lengths to differentiate the IS-F from its more sedate IS-series brethren. Take the IS-F's exclusive power plant, for example, which begins life as the gas-swilling half of the LS 600h L's hybrid engine and then gets a thorough makeover from Toyota's longtime performance partner, Yamaha. The end result is a 5.0-liter V8 that churns out 416 horsepower and 371 pound-feet of torque, compared with 306 and 277, respectively, from the IS 350's already potent 3.5-liter V6. Likewise, the IS-F eschews the IS 350's six-speed automatic transmission for a heavily modified version of the LS 460's eight-speed unit that boasts Ferrari-quick upshifts and automatic throttle blips on downshifts. The singularity and complexity of this powertrain serve notice to the old guard that this Lexus means business. Like its F1-cum-LS 400 forebear, the 2008 Lexus IS-F is designed to go toe to toe with the best.

Outside the engine room, however, the IS-F has a few kinks to work out. For one thing, while its extensively revised suspension is dynamite on the track, the IS-F falls well short of the ride-handling balance for which certain rivals are justly famous. For another, its exterior styling cues range from the controversial (e.g., the reshaped hood and snout required to accommodate the 5.0-liter mill) to the downright tacky (e.g., the quad-stacked tailpipes that aren't actually connected to the exhaust system). Its German competition, on the other hand -- as well as the upcoming Cadillac CTS-V -- feature relatively compliant rides and subtle aesthetics.

There's no doubt that the IS-F is a serious driver's car, but we can't help but wonder whether its hardcore personality is a little over the top for this segment, notwithstanding its commendably hushed interior and rather incongruous lack of a manual transmission option. Enthusiasts with 60 large to plunk down on a sport sedan may find the IS-F a smidge too fast and furious for their tastes.

Nonetheless, the 2008 Lexus IS-F is a thrilling car on its own merits, and its uncompromising nature indicates that Lexus is willing to do what it takes to ensure that its sporting F models will be competitive with class leaders. The company has already hit two home runs with the letter F, and while it hasn't quite knocked the IS-F out of the park, it's still a promising first step toward challenging the established heavyweights for the factory performance crown.

© Source: edmunds
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2008 Lexus IS-F Preview

Performance sells, especially in the compact sports-luxury class. And for that class, factory tuner cars provide a showcase for the manufacturer's most serious commitment to performance. If the formula is simple - let the in-house hot-rodders loose on what is already a first-rate sports automobile - the implementation is not, and it has a positive effect on the rest of that automaker's cars, especially the all-important compact sports-luxury sedans, coupes, and convertibles.

2008 Lexus IS-FFor a start, the engine was developed in partnership with Yamaha. Nothing new there, as Toyota/Yamaha partnerships go back to the Toyota 2000GT of the late 1960s. The Yamaha engineers involved were last associated with the company's most recent Formula One engine effort, so they were well-versed in high-performance engine design and development. The block is die cast aluminum, with a forged steel crankshaft featuring mirror-polished journals for minimum friction. Connecting rods and pistons are designed and built for strength and durability in high-rpm operation.

The Yamaha-designed cylinder heads have a lightweight four valve per cylinder valvetrain with titanium intake valves, a dual-intake induction system that opens a secondary intake above 3600 rpm for more power, the SFI D-4 direct and port fuel injection system (similar to that used in other IS models) that allows a high 11.8:1 compression ratio for increased power and efficiency, and a new twist on the VVT-i variable cam phasing system. VVT-iE still uses conventional hydraulic control to "degree" exhaust camshafts - rotate the shaft relative to its static position to advance or retard valve timing and change valve overlap. Because this uses engine oil, which needs to be warmed to operating temperature and viscosity for the system to work, it doesn't operate when the engine is cold. To get by this problem, the intake camshafts are degreed by computer-controlled electric motors. The result is improved running from cold, increased power - and increased fuel efficiency and decreased emissions. Unlike some competitors, the IS-F will not come with a "gas guzzler" surcharge. Maximum power, all 416 horses worth, is developed at 6600 rpm, with maximum torque 371 lb-ft at 5200. Redline is 6800. And EPA mileage is 16 city, 23 highway.

If the engine is interesting, the transmission is even more so. Manual shifting is a necessity in a high-performance automobile, and high-tech high-performance these days means an automated manual gearbox, with lightning-fast up- and down-shifts controlled, along with the clutch, by electronic and hydraulic wizardry. Such gearboxes are found in all major road-racing series, and in many of the IS-F's competitors. They are not torque-converter automatics with manual shifting. Audi's twin-clutch DSG is the benchmark. Lexus challenges it with an eight-speed gearbox with a twist - it's both a torque-converter automatic in automatic mode, and fully manual in manual mode in gears two through eight. First uses the torque converter to deal with the stresses of starting, but it's locked up otherwise in manual, to provide a direct connection between the engine and transmission. Upshifts can take as little as one tenth of a second, with downshifts taking two-tenths. Engine and transmission revs are automatically matched during downshifting.

© Source: theautochannel
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