At 4k rpm, how fast? | FerrariChat
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At 4k rpm, how fast?

Discussion in 'Boxers/TR/M' started by Hipporacer, Sep 24, 2023.

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  1. Hipporacer

    Hipporacer Karting

    Jun 26, 2021
    55
    Springfield IL
    Full Name:
    Julia M Stapleton
    #1 Hipporacer, Sep 24, 2023
    I'm just curious. I don't know if it even means anything when it comes to the cars performance. But how fast do your testarossas run when in 5th gear at around 4krpm? Mine runs right at 100mph. And seems to like it having to give it little gas to maintain.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,826
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Sep 24, 2023
    You're in the right ballpark if a US version TR. Per the US version gear ratio numbers (and assuming the effective rolling radius of a 255/50-16 rear tire is 12.525" which is just a guesstimate), 100 mph = 3905 engine RPM. However, dash mounted tachometers and speedometers aren't the most accurate devices on the planet ;).
     
    2dinos and Rifledriver like this.
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,105
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #3 Rifledriver, Sep 24, 2023
    If I recall in a US TR 100 is about redline in 3rd. In 5th it is a very easy cruise requiring very little of the motor and is a pretty sedate speed.
     
  4. Basal Skull

    Basal Skull Formula Junior

    Oct 26, 2010
    427
    Vancouver BC
    #4 Basal Skull, Sep 25, 2023
    Image Unavailable, Please Login

    From the manual (1991 US)
    4000 rpm would be 102.4mph

    And in 3rd at redline 6800rpm would be 99.96 mph


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