Dyno Inaccuracy

[JJ240]

I was just at a dyno shootout today and a few of my friends ran. It seems like the dyno was giving really low numbers. 2 Preludes with the H22A ran, one with just intake got 127HP and one with intake and jackson supercharger got 197HP. Stock for both cars listed is 197. My friends turbo civic running 6.5 PSI with full 2.5 inch from the turbo back only got 154HP. My other friend only got 176HP from his 2002 maxima with GReddy SP exhaust and underdrive pulleys. It is listed at 255HP stock. I know the stock numbers are most likely to the crank, but they all seem too low even to the wheels. 35% drivetrain loss seems way too high so the dyno must be off. What do you guys think?

[Aries]

the dyno probably needs to be recalibrated.

[JJ240]

So you agree those numbers sound low enough that its more than drivetrain loss?

[lessthanjakejohn]

I think its around 10% more than driveline loss

[mattback]

Sounds to me like it is a Eddy current dyno..