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Thread: Rolling Road accuracies.

  1. #1
    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default Rolling Road accuracies.

    Does any know (with data, not just 'I think.....') how accurate rolling roads actually are? Ie, how repeatable and how reproducable are tests?

    Effectively, and technically, is anyone aware of a Measurement Systems Analysis (MSA) performed on any?


    I think the results would be very interesting indeed.

  2. #2
    spoons
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    Dont even get me started

  3. #3
    Regular Member mark1319's Avatar
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    Accurate? If you catch a good one on a good day Reliable? Hardly ever.

    Thy're just neither of these IMO, after every RR day someone is having a moan that their car isn't performing right when it's more than likely the RR thats not giving proper figures.

  4. #4
    Regular Member parapaul's Avatar
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    The only accurate way to dyno a car is to remove the engine and bench test the engine directly.

    Rolling roads are only useful (IMO) if you want to see trends. If you use the same RR each time you should be able to see the effects of any mods.

    Just taking the car to a RR and expecting the readings to be accurate is a bit hopeful, I think. Taking the same car to several RRs will no doubt give as many different results. But presumably the more readings you get, the better average you'll be able to guess.

  5. #5
    Regular Member BigMan's Avatar
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    Personally they are a waste of money!!
    They can be doctored to produce what you want them to i believe!
    Only truly accurate way of finding out how accurate they are, is to Dyno an engine, then put that engine in a car and rolling road it!

  6. #6
    On a Sabbatical
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    if you are trying to stop them doctoring any of the readings just look at the wheel figures and compare them as you will find the only way they can doctor the figures is on the rundown to workout your flywheel figure .

    if they dont printout your wheel-figures they can be fixed to show what they like

  7. #7
    Full Member Big Sig's Avatar
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    Only use them as a guide, 100 different RR's will give 100 different results.
    Now I need a turbo to keep up!

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