Originally Posted by Christian and Beccy
Personally, I wouldn't use the engine dyno figure as the benchmark as engine dyno's aren't the be-all-and-end-all of measuring power.
In theory, yes, but in practise, not so.
here we go again. an engine dyno
is the best thing for measuring engine power - that's what they were designed and built for believe it or not
a chassis dyno is the best thing for measuring power 'at the wheels' (barring tyre deformation on small rollers, strap down forces etc)
but you can only compare the 2 results if the conditions are exactly the same
that includes things like having the same induction and exhaust systems, same barometric pressure, ambient temperatures, coolant circuit and temperature etc.
and most important of all on a forced induction engine is the same level of intercooling. and that is the thing that is usually the most different between an engine dyno (with perhaps a water cooled charge cooler keeping a constant temperature), a chassis dyno (with an electric blower) and the real world driving conditions on the road (airflow from forward movement of the vehicle).
if you were a proper mechanical engineer, you would understand these things
edit: not meant as having a go at you christian, as you are right about the practice bit
just meant as general information