Originally Posted by HDDP
Brian, great bit of information... Most of the sanctioning bodies, SCCA, IMSA, NASA etc. require dynojets for annual tech inspection because it is believed that they are more accurate. Who knows for sure...
The biggest drawback to the Dynojet is also its biggest strength - the lack of ability to apply a dynamic load to the roller means that numbers are generally more consistent from machine-to-machine, all else equal.
As noted by the OP and others, the operator is usually the biggest variable.
