Lexus IS-F Dyno Run

Discussion in 'OT Driven' started by TriShield, Oct 25, 2007.

  1. TriShield

    TriShield Super Moderator® Super Moderator

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    By Jason Cammisa

    You're in a compact sedan with a 5.0-liter, 416-hp V-8 with four-valve Yamaha heads that contain titanium intake valves. Where do you head? The dyno, of course.

    And so we did. The fellas at Ralph Willis Automotive in Salinas, California cleared their schedule for us to sneak the IS-F onto their DynoJet dynamometer. The results, as you can see from the chart below, are impressive. The IS-F is rated at 416 hp and 371 lb-ft of torque at the engine - and it delivered 333 of those horses and 318 lb-ft of torque to its rear wheels.

    Those are impressive numbers given that the engine's output is funneled through an eight-speed automatic transmission. And how do they compare to the competition?

    An RS4 we tested (see the link below to the full story) put out a very close 331 horsepower (and 276 lb-ft of torque) to its wheels. We should mention that the RS4 was tested on a Dynapack, which may be calibrated differently than the DynoJet model used for the Lexus.

    As always, it's not the peak numbers of a dyno graph that are important, it's the shape of the torque curve. The Lexus' torque builds in a linear fashion as revs rise, but then things get a little hairy. Torque dips slightly between 4500 and 5000 rpm, and then peaks at 5200.

    What happens afterward is disappointing - the curve drops off steeply, confirming our seat-of-the-pants impression that the engine is running out of breath. If you compare the shape of the curve to the RS4's, you'll notice that the RS4's V-8 doesn't make as much peak torque (it is, after all, 800cc smaller) but its twist is distributed much more evenly over a long rpm range. And from 6500 rpm up, where the Lexus is simply done, it continues pulling - all the way to over 8000 rpm.

    The IS-F's V-8 certainly produces a lot of power and torque. We wish, however, that it didn't have such a steep dropoff in torque at high revs - that kind of rev-happy motor would suit the IS-F's track-star personality much better.

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  2. TriShield

    TriShield Super Moderator® Super Moderator

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    IS-F, GT-R, attack of the letters from Japan! :run:
     
  3. nuclear

    nuclear OT Supporter

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  4. thumpr

    thumpr someone you trust is one of us OT Supporter

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  5. Jeebus

    Jeebus Well-Known Member

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    RS4 putting out 331 is more impressive.
     
  6. kumar_a

    kumar_a Well-Known Member

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    oh wow faggot car like whoa
     
  7. Mugatu

    Mugatu Ask me about market research. OT Supporter

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    :rofl:

    Except that this is a Toyota so it will go 1,000 miles without breaking down.
     
  8. kumar_a

    kumar_a Well-Known Member

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    333rwhp :bowrofl:
     
  9. nuclear

    nuclear OT Supporter

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    apparently not according to recent Toyota issues :rofl:
     
  10. kumar_a

    kumar_a Well-Known Member

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    20% loss like whoa
     
  11. Bloody Sunday

    Bloody Sunday OT Supporter

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  12. Bloody Sunday

    Bloody Sunday OT Supporter

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    fixed :o
     
  13. Mugatu

    Mugatu Ask me about market research. OT Supporter

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    :o
     
  14. Jeebus

    Jeebus Well-Known Member

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    While delivering all the driving satisfaction of a lazyboy.
     
  15. RobsMob

    RobsMob Guest

    It's all alphabet soup to me.
     
  16. Mugatu

    Mugatu Ask me about market research. OT Supporter

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    Meh, if I wanted a sporty German car I'd get a BMW, not a bloated VW.
     
  17. Jeebus

    Jeebus Well-Known Member

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  18. dmora

    dmora Guest

    Once again, auto mags fail.
    APPLES AND ORANGES ANYONE?
     
  19. dmora

    dmora Guest

    Auto for the fail. :mamoru:

    2jz > *
     
  20. Jeebus

    Jeebus Well-Known Member

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    Also fails to mention that the RS4 puts out those numbers through its heavy ass AWD tranny.
     
  21. dmora

    dmora Guest

    Those made in the USA are garbage. Anyone who calls Toyota USA and Toyota Japan the same is just a silly goose.
     
  22. WhiteG60

    WhiteG60 Just some guy.

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    Won't a DynaPack give a lower reading since its a hub dyno? DynoJet's typically read a lot higher than a dynapack or a mustang.
     
  23. dmora

    dmora Guest

    weight has nothing to do with a dyno, more so a dynapack.
    Unless they use the same dyno methods. Dynapak doesnt have to have the car move the rotational mass of the wheels to get its numbers.

    Regardless, the IS-F wont be as nice as it would be if it had a real 6sp, and they fix that torque wiggle.
     
  24. dmora

    dmora Guest

    correct.
     
  25. Rich

    Rich New Member

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    I'd drive one just so I can say I was cruising in 8th.
     

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