Bill what are your thoughts on dyno types/makes?
I had a good conversation with Rick on the topic which was insightful, especially with regards US vs UK, dynojet vs dynodynamics.
I know it's a moot topic but it's always good to hear from a dyno operator.
I think the major issue in car culture is not acknowledging dynos as a tuning tool rather than a output measuring device.
Use of dyno by an operator is very significant imho, especially with some makes of dyno which do not measure coastdowns, choosing to add a %/factor to the power run atw figure to "estimate" flywheel/engine power. These estimating dynos, dyno dynamics, and possibly dyno developments also, add to a measured atw figure to get a fly number. These sort of dynos are very susceptible to strapping properly, and can be tricked into reading a high number by simply pumping up the tyres very high.. Also on high power runs, where strapping allows the wheels to ride up off the rear roller, they simply cannot be accurate on loss calculation where rolling losses under power changed during the run, rising off a rear roller... contact patch changed.. but is not measured.
An operator being in "tune" with whats going on, picking up on a wheelspin run for example, as often it will be giving a high yet unrealistic run number.
You have inertia dynos, braked ones, combination of both... twin roller, single large roller... Many variations of design.
Some dynos have poor control.... so operator cannot select a suitable load rate, which in terms of maha dynos to pick one, overly long runs are a consequence..
some dynos appear to inflate losses, after many corrections to atw figure to fly inflate fly too much
USA vs UK from what I've seen and read over the years it very happy dynojets in the usa where their atw figures seem more like our fly.
only uk dynojet I've seen and been on is awesomes. It read higher power and especially torque than my own. Its happier.
They are all a tuning tool however. Pick one, stick with it as a tuning gauge. So long as its used consistently it should show gains and losses as you go down the tuning route game.
Not everyone will agree with me of course, but this is my take on things as I have seen and experienced them
