I had my stock Cayman S dyno'ed on sunday, it turned out 278 HP at the wheels and 339NM (250,77 ft/lb) of torque. That's more than okay I think, from results I've found in previous threads. It had 19" Carrera Classics on at the time - could anyone speculate on how big the difference would be with 18" standard wheels?

Is there any difference making a dyno test with a soft or a hard rev limiter - I'm thinking about "SPORT" mode engaged or not?

Besides that, how do you measure power at the flywheel?