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Wheel figures are the only ones whihc count for me anyway.

How is the relaiability at these levels? Will the car be clocking up a lot of miles? It would be interesting for prospective customers as I don't think the durability has really been tested yet?
 

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Yes but what type of rolling road do you think produces the most accurate "at the wheels" figure? What corrections would you allow for atmospheric pressure, height above sea level, ambient temps etc?

The only legitimate use of a rolling road is to measure changes, preferably on the same day, but certainly on the same RR.

As for reliability, there are dozens of USDM GT-Rs running at "700+" whp without issues beyond clutch slip in some at the higher end of the scale. The first ones beyond 700whp have been that way for about a year now. Certainly the engines themselves seem very tough.
Well I don't want to get into a dyno debate, as i've wasted many hours of my life there :D But when you are up at these sort of figures, a WHP figure is generally a good guide. Knowing the last .1 of a bhp isn't relevant. Using calculated ATF figures is where it goes very wrong. In terms of ambient compensation, a well setup Dyno Dynamics RR seems to get very good repeatable results. You just have to make sure your IT and AT are very close or things start to get screwed up.

Bench dyno's are all well and good, but just not a practical solition for most tuning places - plus how do you account for things like the exhuast system? It's nice to know the engine figure, but for the end user it's not that relevant imo.

For most of us, the most relevant figure is what is going to the wheels, with the car in a completed state. And that is an easier figure to find...

If you are a tuning outfit / trader, your interest is selling accurate figures. For that I wouldn't use my own in house dyno, I would take the car to a couple of independant dyno's so give some comparable results.
 
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