Originally Posted by
testastretta999
I know the mapping operator of the dyno and he has said of several occasions it reads low, but quite consistant and accurate.
Reads lower than other brands of dyno's. i.e dyno dynamics

Anyone who owns/works using only one dyno will always tell you theirs reads low

it's one of the biggest cons in the tuning business
"Yeah mate, this Dyno reads really low. XX% less than *Generic other make*"
Dyno's are comparison tools, there's no way to tell how Nobles reads compared to Emerald