Quote:
Shaun,
To answer your original question, you can get 100 + hp at the flywheel from the A12 reasonably easily and have good reliability. To achieve 100 hp (75 kw's) at the rear wheels is a much bigger ask from an A12.

The problem with quoting torque or power figures is that they are not being compared on the same machine (with the same in-accuracies) on the the same day.

Some chassis dyno types: water, fan, generator or induction brake type dynos, and high-mass (inertia) rollers.

These dyno types use different types of measuring methods for torque including: volume of fluid pumped through a known area restriction, quantity of electrical output into a shunt, torque on a strain gauge, mechanical spring scale on a torque arm, and time to accellerate high mass rollers between two rotational speeds (inertia - type).

External (non dyno )things that can affect the output figures are: gearbox gear-shape/size, uni-joint angles, differential ratio and wheel/tyre diameter.

With so many variables, comparisons between dyno outputs are meaningless.

The best way to gauge rear wheel output is by measuring straight line accelleration at full load for a known total mass of vehicle in direct drive 1:1 ratio and a known tyre diameter, starting at a speed where no tyre slip occurs at full power up to a final desired speed over time. Then hit it with the old F=MA to work out force, then apply that to the radius of the wheel contact patch and you have wheel torque that can be used to give wheel kw's.

Repeatability between runs on even the same electronic "whizz bang" dynos are a problem, let alone relating the figures to another (maybe not even similar type) dyno figures. This applies especially to comparison mode from one of the largest manufacturers.

Comparisons between engines apart from those done on the same engine dyno to standard conditions are meaningless.

Awaiting the flames