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If you are accelerating a car, then part of the torque produced is consumed to accelerate all of the rotating components of the car, ie Wheel/Tyres, Driveshafts, Gears etc. Vehicle inertia is best explained as this.
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Power and Torque upgrades for Holden Colorados part3 VEHICLE INERTIA FACTORINGĪnother example of why sometimes people get curious dyno results from different dyno brands is because one dyno manufacturer may attempt to factor in Vehicle Inertia while another may not. It could also be used to convince a vehicle owner that a vehicle generates far more power than it is capable of. At least one brand of dyno has built in an easily accessible “correction factor” that the dyno operator can use to increase or decrease the results produced, and so, for example, in the hands of an unscrupulous operator, the “correction factor” could be used to mislead a customer about extra performance when no performance benefit was actually achieved. But not all dyno manufacturers have taken that approach. Is it possible that at least some operators would mislead a customer about the extra power produced by an aftermarket add-on or a performance tune if they were able to do that? In a market place where more power seems to be better, would it be in a dyno operator’s interest to satisfy a vehicle owner’s desire for high power figures? Many dyno manufacturers have ensured that the “operator factor” is eliminated as far as possible, meaning that they lock the operator out of areas of the dyno controller where results can be “influenced” and follow a policy where all relevant dyno run factors are displayed on run files and printouts so that any attempt that has been made to manipulate the results can be easily identified. The evolved dyno operator of today has much greater influence over the results produced on a dyno than ever before, and the dyno operator has become another reason why a vehicle can show different power readings on the same dyno at different periods of time. Let’s look at how results can be influenced. An intrinsic part of producing accurate, honest and consistent results from a dyno requires that the dyno dictates the power produced by a vehicle without undue influence from the dyno operator. So what other factors are involved? We would surely all agree that any dyno manufacturer worth their salt is interested in producing accurate and honest results from their dyno.
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Faster computers and the flexibility of the Microsoft Windows operating system have given dyno programmers a far more powerful tool than they have ever had before. The better quality dynos can now generate vehicle specific information and a level of accuracy that was not conceivable even a few years ago. Dynos that are available these days have mostly evolved into state-of-the-art diagnostic tools and keep pace with the high-tech advances in motor vehicle technology. Now, would it not follow that if the vehicle was unchanged and weather conditions were constant, that one vehicle could be expected to produce at least similar results on several of the same brand of dyno, or all dynos for that matter? Is incorrect calibration likely to be a factor? Perhaps, but with modern dyno hardware, a dyno is not likely to lose calibration through normal use. The dyno operator had little influence over the dyno and had to accept the results that the dyno produced. TEarly chassis dynos were only able to apply load, and subsequent models were extended to measure some basic outputs like torque, power and speed.
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Read on to get an understanding of the reasons behind the variations in results. Others say a dyno is only useful as a tuning tool and does not need to be relied upon to be accurate. But some people say that the accuracy of a dyno is not as important as its ability to reflect the outcome when modifications are made to a vehicle, and its repeatability. Just how accurate are the dyno power readings? Why does the same car get different results on different days? Why does the same car get different results on dynos from the same manufacturer and from different manufacturers? One needs only to peruse some of the “forums” on the internet to see that there can be significant differences in the results produced by the same vehicle when run on different brand dynos and even on the same brand of dyno. There is much deliberation around the industry about dyno accuracy.