You can check torque vs hp easily, remember that torque is what the dyno measures, hp is calculated by the dyno its not an actual factor that is measured. Heres some info:
http://www.howstuffworks.com/question622.htmSo if you take your bhp and torque readings at a given rpm (5252rpm) you can compare your hp and ft/lb and see if they match up.
I was working on a dyno that was throwing up big torque figures once, remembering that the 3 main factors are the power of the car, the acceleration rate of the car against the given load applied by the dyno and the engine RPM, we looked at RPM. Instead of using the cars clocks as an rpm guide we used a feed from the injectors onto an oscilloscope and then fed this into the dyno divided by 4 (4stroke, 4cyl engine) and realised that the rpm input we gave the dyno from the clocks was 370rpm out at 3500 rpm under load. This skewed the calculations and gave us 18% more torque, but no extra peak rpm.
Dynos are a lot more than a rolling barrell, theres lots more than meets the eye. A simple problem with the rpm calculation can make big differences in figures. Any form of hub or chassis (drive on) Dynos are not ideal for power measurement due to the factors that can affect figures, but as a software development and 'difference' tester they are invaluable to a tuner.
What makes me laugh is that one day its claimed dyno X reads low, then a week later on another forum it reads high, some dynos read loads lower than most others and some people class this one as being the most accurate, then other people only use dynos that give massively higher figures to massage their own ego's.
If you want a true power figure, use an engine dyno :) if you want a guestimate flywheel figure then use a chassis/hub dyno. If you want something realistic ask your dyno operator for @the wheels numbers, thats the only true measurement the dyno actually reads.
