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What Will Be The IS-F Final HP Number?

  • Under 400 HP: Lexus Will Miss The Mark

    Votes: 1 1.9%
  • Between 400hp to 410hp

    Votes: 3 5.6%
  • Between 410hp to 420hp

    Votes: 29 53.7%
  • Between 420hp to 430hp

    Votes: 9 16.7%
  • Between 430hp to 440hp

    Votes: 5 9.3%
  • Between 440hp to 450hp

    Votes: 3 5.6%
  • Between 450hp to 460hp

    Votes: 2 3.7%
  • Between 460hp to 475hp

    Votes: 1 1.9%
  • Between 475hp to 490hp

    Votes: 1 1.9%
  • Over 490HP: Lexus Will Lead The Category

    Votes: 0 0.0%

What Will Be The IS-F Final HP Number?

15115 Views 11 Replies 10 Participants Last post by  nlsone60

49How Much Horsepower Will The New IS-F Debut With?
Agent009 submitted on 07/16/2007 Official Bell & Ross Timestamp: 3:04 PM
[75] user comments | category: Misc News

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As the IS-F debut draws closer Lexus has wisely chosen to keep the actual horsepower of the high performance motor a well kept secret, mentioning only a figure somewhere in excess of 400 hp.

A few months ago Car and Driver reported that the 5L V8 had made as much as 483 hp in an (at the time) IS 500 mule. In April Road & Track also ran an article about future Japanese sports cars, where it said that Toyota was developing a new Supra and Lexus IS 500. Both would be powered by the same 5 liter V-8 putting out 450 hp and 383 lb-ft of torque in the Supra and detuned slightly for the IS 500 (IS-F). So many sources seem to indicate that Lexus may lead both the RS4 and the M3 and slightly trail the Mercedes-Benz C63 AMG in overall horsepower.

With this taken into consideration, Lexus also repeatedly says the car will have more than 350 lb-ft. Given that the 4.6L motor produces 367 lb-ft, it stands to reason an out and out performance motor could have substantially more hp/liter than the 4.6L motor and a slightly less torque peak that a higher horsepower peak would imply.

Now if Lexus only gets the same 82.6 hp/liter from the 5L motor that it has wrung from the LS 460's 4.6L V8, the car would then produce around 413 hp. But this seems a bit overly conservative since the RS4 and new V8 M3 are both producing similar power with less displacement. Reason would dictate that Lexus should have a similar hp/liter ratio if the engine can maintain a similar redline.

So what is the $64,000 question? How much power will the new IS-F actually have when it comes to market? Give us your answer below, and of curse feel free to comment as well.

What Will Be The IS-F Final HP Number?
Under 400 HP: Lexus Will Miss The Mark
Between 400hp to 410hp
Between 410hp to 420hp
Between 420hp to 430hp
Between 430hp to 440hp
Between 440hp to 450hp
Between 450hp to 460hp
Between 460hp to 475hp
Between 475hp to 490hp
Over 490HP: Lexus Will Lead The Category
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1 - 12 of 12 Posts
A wild guess. 430 hp, 390 lb-ft tq.

My estimate/quess is 437 hp, and I'll let you try to figure out how I came up with that number :) My torque estimate is 376 foot-pounds.

Does the person with the closest guess win a prize? LOL
Hmm.. Thats a good idea! I just created a poll so everyone can vote!
The poll is missing the 420-430 hp option, which is the one that would get my vote.
415hp per the product specialist at Taste of Lexus Irvine today. I will confirm this and torque numbers shortly.

The 415 HP figure is not correct. The final output will be released by Lexus very shortly.
I am going to say between 410-420hp and that's my final answer.. :)
An unnamed exec at Lexus tells me 478 HO is the lucky number for the RCF.
I really appreciate the kind of topics you post here.
1 - 12 of 12 Posts
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