How Much Is 250rwkw In Engine Kw?

[BaysideBlue]

Already covered that- tyre slip against the rollers

I've seen cars with the boot loaded with friends or bags of sand/cement smoking the tyres against the rollers (we're talking mega power here)

Remember, the ramp rate is controlled by the load cells in the dyno (which can generate monstrous amounts of braking force)- the easiest outlet for the power is in the form of slip.

The only accurate way to compare figures is to measure on an engine dyno, if the air temps and relative humidity are consistent between engine tests- and even then it depends on weather both engine test rooms used SAE or DIN standards.

You are missing the point. Like I said before, All external variables like dyno tweaks or "tyre slip" are excluded from the equation. Assumed to be remain constant means no tyre slip.

When someone's car makes 600rwkw on the dyno, you can not simply say "well, that means you car makes 780kw at fly because theres 180kw worth of tyre slip".

[Cubes]

The thread op has asked How much is 250rwkw in Engine Kw..

That places myself under the impression he's after a comparison of flywheel kw to a rolling road dyno where tyre slip etc does exist.

So tyre slip in my eyes is relevant. As I mentioned earlier.. Clint32. 580hp (432kw) on the engine dyno. On the rollers 338rwkw. 338 * 1.3 = 439kw. Its pretty damn close to what was seen in practice you have to admit.