Do different brand of dyno's give different figures,on a dynapack my car produced 223rwkw but I've just had it dynoed on a dyno dynamic twin retarder dynamometer and it produced 202rwkw,In saying that when I dropped it off they told me there figures would be lower than the dynapack as the dynapacks are very generous.
ps heres a very handy conversion site where you can convert just about anything.

http://rawge.bravepages.com/minichopper ... verter.htm

f**k oath they all read different.
Was it in shootout mode when they dynoed it on the Dyno Dynamics one?
In my experience, shootout mode and hub dynos will generally read higher then Mainlines and non-shootout mode dyno dynamics dynos (that aren't fudged).

Which ones right?
Doesn't matter, as long you use the same one to compare mods on your car.
Use mph at the strip to compare between different cars.

differnt opperators.. different mode's.. different temperature... differnet brands alll play a part in the dyno figure.. alll will read differently..

a dyno is merely a tuning tool.. a tuner can make a 150rwkw car show 400rwkw if he wants.. most don't go to that extreme, but some do show high figures to justify their equally high charges..

Be more concerned in the curve, and as was said, use the same dyno, or use it until you find a better tuner and then stick with that dyno. If they always use the same settings when tuning your car you'll be able to gauge increases/decreases accurately