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355 speedo accuracy

Discussion in '348/355' started by F355Bob, Aug 23, 2006.

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  1. F355Bob

    F355Bob Formula 3

    Nov 4, 2003
    2,001
    Madison, Wisconsin
    #1 F355Bob, Aug 23, 2006
    how accurate is the speedometer in the 355? I read an English reprort that reviewed the car when new and they had the acctual speed and the speedo reading and they were about 10mph difference. In 6th gear I think it is 21mph per 1000 rpm. I looked at my car at 3000rpm in 6th and the speedo read just over 70mph but in theory it should be 63mph. Is this true for only early cars.
     
  2. kev 355

    kev 355 Formula Junior

    Jul 26, 2005
    528
    Burbank, CA
    Full Name:
    Kevin
    #2 kev 355, Aug 23, 2006
    Mine is 9% off. So when it reads 100, I'm really going 91.

    Best thing to do is have a portable GPS unit in the car for a true readout.
     
  3. 285ferrari

    285ferrari Two Time F1 World Champ
    Sponsor

    Sep 11, 2004
    20,958
    MD and NE
    Full Name:
    Robbie
    #3 285ferrari, Aug 23, 2006
    Even better a nice radar unit mounted in the car.....
     
  4. Aircon

    Aircon Ten Time F1 World Champ
    BANNED

    Jun 23, 2003
    100,524
    Melbourne, Australia
    Full Name:
    Peter
    #4 Aircon, Aug 23, 2006
    mine is out by 3% with standard sized tyres. i doubt you'll find much better than that in any car.
     
  5. j7ols

    j7ols Karting

    Sep 11, 2005
    52
    Greenville, NC
    Full Name:
    Jools Bourne
    #5 j7ols, Aug 23, 2006
    Does this mean that a (for example) 10,000 mile (on the speedo) car has actually done 9%, 900 less miles?
     
  6. mdraeger

    mdraeger Karting

    May 26, 2005
    138
    hong kong
    Full Name:
    mike draeger
    #6 mdraeger, Aug 24, 2006
    They're just as accurate as the claimed curb weight and horsepower
     
  7. Aircon

    Aircon Ten Time F1 World Champ
    BANNED

    Jun 23, 2003
    100,524
    Melbourne, Australia
    Full Name:
    Peter
    #7 Aircon, Aug 24, 2006

    i'm yet to find a discrepancy
     
  8. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,219
    Mount Isa, Australia
    Full Name:
    Pap
    #8 PAP 348, Aug 24, 2006

    That is pretty close alright!! :D
     
  9. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,219
    Mount Isa, Australia
    Full Name:
    Pap
    #9 PAP 348, Aug 24, 2006

    Even claimed HP........;)
     
  10. Aircon

    Aircon Ten Time F1 World Champ
    BANNED

    Jun 23, 2003
    100,524
    Melbourne, Australia
    Full Name:
    Peter
    #10 Aircon, Aug 24, 2006
    in all but the 355, yes.
     
  11. Ricard

    Ricard Formula Junior

    Jan 23, 2004
    867
    Donington Park
    Full Name:
    Richard C
    #11 Ricard, Aug 24, 2006
    All speedo's read low in the UK, usually about 5-7%. You can tell when driving through Specs camera arrays (average speed check) where everyone is doing a few mph less than the limit and wondering how you are getting away with overtaking them :D.

    Interesting point is in my Audi, although the speedometer reads low - the average speed on the info display (once reset) reads bang on (compared with GPS).
     
  12. Ricard

    Ricard Formula Junior

    Jan 23, 2004
    867
    Donington Park
    Full Name:
    Richard C
    #12 Ricard, Aug 29, 2006
    Checked my 355 yesterday and its bang on at 50mph (80kph) - which is a first for any car I have owned (standard tyre/wheel size).
     

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