• Oct 25, 2007
Lexus is billing the IS-F as "Everything you thought we weren't," and the potential is certainly there. The engine bay is filled with 5 liters of 4-valve V8 putting out 416 horsepower and 371 pound-feet of torque. The Minilite-esque wheels hide a Brembo braking system with six piston front calipers and cross-drilled rotors 14.2 inches in diameter. The sill extensions wrap up the front fenders to form a styling detail reminiscent of extractor vents, and the rest of the body has been tweaked in the wind tunnel to improve high speed aerodynamics. It all sounds good when you read the spec sheet, and the car does at least look aggressive . What everyone's dying to know, though, is "has Lexus done it this time?" Automobile magazine had the same burning curiosity, and they just also happened to have an IS-F sitting in their lot.

In no time, they headed over to their local Dynojet. The result? Well, they're a little disappointed, and they're calling the torque delivery peaky. Looking at the dyno graph, we're not sure we'd agree entirely with that assessment. There's at least 225 lb-feet at the wheels from 1,800 rpm, topping out at 318 lb-ft. First, let's point out that 15 percent torque loss through a drivetrain including an eight speed automatic is pretty phenomenal. Secondly, the torque curve is pretty fat below the peak. What is surprising to everyone, though, is the way the power drops off precipitously on the other side of the 5,200 rpm peak. You'd think an engine with 4-cams and Yamaha-designed cylinder heads would be a revver. Of course, there are lies, damn lies, and statistics and these dyno results are sure to kick up some debate. What still remains to be seen is how the entire package works when pitted against its bogeyed competition. For that, we must still wait.

[Source: Automobile, photo: Automobile]


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    • 1 Second Ago
  • 23 Comments
      • 7 Years Ago
      Weak. And this is on a dynojet. They always overrate HP. Try it on a Mustang dyno, and it'll be more realistic.
      • 7 Years Ago
      I drove the IS-F in the GT5 demo with the logitech forcefeedback pro wheel dealie last night. and compared to the 135, the IS-F was a horrible performer. it was fat, sluggish, soft. I think the new Mazda 6 (FF) was funner to drive than that thing, which saddened me. And the new evo, sti and GTR were in a totally different league.
        • 7 Years Ago
        I'm not denying that the IS-F isn't exactly a track machine, but Lexus knew that from the start. The kind of people that can actually afford this car and are interested in buying it aren't going to take it to a track. They will drive it to work and maybe push it a little bit on the weekends but thats about it. If this car was as good as the EVO on a track, it would be a rough ride and it wouldn't be a luxury car anymore because it would have to be so light. No one would buy it then because the EVO would be way cheaper anyways.
        • 7 Years Ago
        Post comments when you learn to drive.
        • 7 Years Ago
        Umm...

        Please tell me you're not basing your opinion of a car on it's representation in a videogame? That's only very, very slightly less disingenuous than spec-sheet racing.
      • 7 Years Ago
      Dan Roth, the 8-speed automatic does not have torque converter loss, if they dyno'd in manual mode.

      The torque converter is locked from gears 2-8, which means there is no automatic transmission loss.
      It's a direct link, same a manual transmission.
        • 7 Years Ago
        I would expect the losses to be nonlinear across the rev range, too -
        • 7 Years Ago
        It may only be a 15% torque loss at peak torque RPM, but there's a 20% loss in HP at peak HP RPM. 333hp/416hp = 80%.
      • 7 Years Ago
      305 cubic inches pushing 330hp to the pavement isn't too bad. What I'd like to know is if the IS-F's motor is as stout as the 1UZ (bulletproof but also falls on it's face in high revs when left stock).
      • 7 Years Ago
      you guys ever proof read?
        • 7 Years Ago
        Specific gripe?
        • 7 Years Ago
        You see their interview on Autoline? Get it out quickly, as fast as possible, make corrections later...
        • 7 Years Ago
        Dan:

        Perhaps hoeun was referring to the "4-valve V8" - while you probably meant 4-valve per cylinder, it sounds a little weird.
      • 7 Years Ago
      Many ESP equipped vehicles will reduce power or brake above a certain speed if it detects that the front wheels aren't moving along. I know the IS-F has fewer nannies or the ability to turn them off specifically, but perhaps there are still some such residual programs trying to stop you from spinning out in the rain when you're strapped to the dyno. Just a thought. I would also say that the real world performance and 13.0 second quarter mile time is evidence enough that this vehicle can deliver, and when you consider the luxury coupled with the performance this vehicle is a bargain. Thirteen seconds is faster than a lot of cars can make it to sixty mph.
      • 7 Years Ago
      ppl are saying the exhaust tips are just for looks, consider that Porsche has done this with previous Turbos (the one circle going into another circle exhaust tips)

      also, some testing has stated 0-60 in 4.2sec (C&D) and 13.0 1/4 mile (Motor Trend)
      • 7 Years Ago
      I've said it before and I'll say it again, Lexus cannot and will never build a true or respectable sports car. They build luxobarges and show ponies. The fact that this so-called hi-po, DOHC engine dies at 6500 rpm is pathetic. Maybe if it were a OHV torque monster, it would be different, but they are dropping a merely average 5 liter engine in there and calling it high performace. Gag.
        • 7 Years Ago
        www.youtube.com/watch?v=ShrOWznZbns

        the LF-A looks (and sounds) pretty respectable so far. No need to pigeonhole manufacturers.
        • 7 Years Ago
        More than 318 lb-ft? LOL. The old Windsor 5.0 had more TQ than that. As for DOHC same as this engine there are many with that much TQ or MORE. Jag Aj-V8 for example, only 4.2L and 310lbs. New mustang has 320lbs and its only 4.6L and 3v, the 4v version is 335 ft-lbs.
        • 7 Years Ago
        Name me a n/a 5 liter OHV ''torque monster" that puts down more torque then this engine.
        • 7 Years Ago
        Why not? They all have design and manufacturing philosophies. Lexus's is "quiet, boring, soulless." And give me a break on the don't pigeonhole lexus. People have been doing that to doestic manufacturers for years, and rightfully so in most cases. If you don't at least take into account past performance, you are deluding your view of future outcomes.
      • 7 Years Ago
      Actually, i'd say if anything, the 8 speed would have to change gears too often and thus would loose time overall while managing a marginally higher top speed. The joys of closer ratios :P
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