More than a Dyno

By now people are realising that Inertia dynos are crap.

Take a look at for a comparison of HP and DJHP (dynojet HP). It's fair to say that DJHP has become an established term for an exaggeration of HP by 15% to 24%. We report Actual HP delivered by the rear wheel to the dyno`s roller.

Our figures (where we've been able to test similar bikes) seem to agree with Factory Pro's listings of true HP but as their report says; " These figures are honest, true, fair and repeatable by proper dynos across the entire industry"

Inertia dynos can be made to give very differing results for as little as different weights of tyre and even how much air pressure is in the tyre! You can't fool a static dyno… If you can't lift the weight … you haven't got the horses! Another disgrace is the adding to rear wheel HP to `guess` the HP at the crank. There is no `magic 15%` that can be added to ALL bikes' RWHP to give crank HP!
Belt Dv, Shaft Dv, Chain Dv, Primary Dv type, Tyre Profile etc etc.. All bikes are different. So unless transmission losses are to be measured properly, they should be left out of the equation.

Rear Wheel Horse Power is all that we can trust and improving it is our mission!
HP aside, Inertia Dynos are crap because the load is all wrong. In the real world the biggest load factor is wind-drag. The difference in wind drag at 20mph and 200mph is absolutely enormous and yet an inertia dyno provides the same load at all speeds! It only provides a load at all if the bike is accelerating. When setting-up fuelling, it is very important that we put the bike under realistic loads so that it behaves the same out in the real world.

Our programmable-load, Static Dyno can hold the engine rpm down to whatever rpm we need to study for any desired throttle position. This makes it very useful for mapping `main map` fuel injection (without activating `acceleration map` richening)