Quote:
Originally Posted by arghx7
What dyno are you using? If you had a dyno capable of road load simulation you could get pretty close to finding the real max speed without taking the vehicle to a runway or something.
Road load dynos apply load to simulate wind resistance, rolling resistance, etc. The load increases according to a quadratic function- a +bx +cx^2 , where x is basically the weight of the vehicle. You would want to use the load coefficients (a, b, and c) from Subaru or Toyota's EPA fuel economy certification applications. Those applications should be released on their website over the next few months.
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That would be an inertia dyno like our Mustang. It's still up to the operator to set it up correctly. You enter the weight and coefficient of drag from a chart and it calculates the load it wants to put on the wheels. This is why inertia dynos always read lower than Dynojets etc.