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Originally Posted by tristancliffe
If you want power/torque numbers, then rolling roads are useless.
If you want the general shape of the torque curve, then rolling roads are quite useful.
If you want to sort out the fuelling/ignition on your car and set up the dynamic behaviour of your engine and drivetrain then rolling roads are pretty damn good.
In other words, it depends what you want. There is a reason why car manufacturers and professional race teams don't use rolling roads, and it's not because they're really really good.
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Lets not forget that Mr Average club racer does not have the money to build a dyno facility in their garage or indeed have an engine dynoed. So they may not be perfect but they are better than nothing.