Join Date: May 2013
Location: Left Coast, Canada
To my mind a tuner uses an oxygen sensor to adjust a fuel controller to change the output to his oxygen sensor to attain levels he feels is optimum throughout a range of operation. The end result is based on his technical knowledge/abilities and the characteristics of the engine. The dyno is simply a measuring device that displays the result of that work.
To that end, an experienced master tuner who is proficient with a specific fuel controller, mechanical or electronic, can tune an engine to the same level. He just can't give you a nice shiny picture for bragging rights.
Sure a dyno might help them see room for minimal improvements but that's drag strip stuff and of little real benefit to most of us on the street. It can also show areas of general performance for things such as intake, exhaust, cams, valves, etc but again, an experienced tuner can tell you those things already. The dyno doesn't do anything but show you a picture.
Is a dyno simply a measuring device that allows the less experienced technician to achieve the performance levels previously attained only by the true masters of the craft?
For the masters does it simply transition the measuring parameters from 'seat of the pants' to a documented level. They can get the results faster than multiple timed runs down a track but in the end I think they get to the same conclusion.
It's just a tool.
Not all those who wander are lost.