No, there is no rolling road I know of in a tuning environment that is good enough to replicate accurate top speed conditions. I have had the opertunity to work on a couple of OE car manufacturers wind tunnel rolling roads and thats as good as it gets, but certainly no tuning outfit has anything like that setup!

That's not to say it can't be valuable taking your car to a well setup rolling road, because a good operator can certainly get a good feel for how well the car is mapped, which is much better than having no idea how the car is setup. The biggest problem comes in extreme setups. With the YB engines I am up at over 10,000rpm and boost pressures approaching 3.5 bar (more to come!) and these conditions cannot be simulated accurately on the rolling road. Detonation, heat and specifically EGT's are so critical under top speed conditions, it simply has to be mapped in car to be confident it will last! Remember thats how all OE manufacturers do it, engine dyno for development followed by months and months of live mapping in all conditions all over the world! No OE car manufacturer ever goes near a rolling road for mapping, end of story!