i agree non are 100 % accurate nothing can be imo, but dd seem to calculate an accurate fly figure as rods car has proved more than once now compared to engine dyno, hub power is always more than wheel power so less needs to be deducted, take my supra for instance i bought it as 1000 hp car, then got it dynoed and thought it was 900 hp but in reality it is around 840 hp at the flywheel 760 at the hubs.

i want to see a dd dyno with the supra but will have to put my pirellis back on as im 100% confident it will tear the 888s to shreds on a tyre dyno.