How did you determine crank horsepower from the dyno dynamics WHP figures? Or is this a dyno that calculates flywheel horsepower from its own wheel hp measurements?
How much did the car actually make at the wheels?
Different dynos read lower or higher. They can all be messed with. Some tuners make their dynos read really high because that way it makes the customer feel good about the extra performance they didn't really get.
Anyway, if you don't know what a 370Z usually makes on that dyno (using the same settings, same ambient temp, etc.) I wouldn't be too concerned, but maybe take it somewhere else to double-check this dyno doesn't read low. Those chp numbers are far below stock - if they were whp numbers, I'd say you did pretty good.
