Quote Originally Posted by slipshot View Post
All very true and quite right, but it just goes to demonstrate that the issues with dyno is as much the operator as it is the day of the week, the weather, the car etc. Basically, to my mind the only value of seeing what the ECU upgrade offers is what the manufacturer is telling you, since they have a pretty decent dyno that uses the same settings each time, coupled with the real ideal scenario of having your car on a dyno before it's been tuned, then the Bluefin or anything else is uploaded, then it is put back on the dyno and the two graphs plotted against each other. Only then can you truly see what the power gains bring.

With all due respect, seeing a graph on one car shows a power output relevant to that dyno, and that car on that day with that operator. I bet you take it back on another day and the figures will vary - perhaps not by much, but the upgrade is only as good as the car was in the first place.

Thus, any operator (and in this case DNA Tuning since they uploaded the graph above), while the graph can look good, if you could show the car without the tune and then with the tune, all of a sudden we have a proper case of same dyno, car, operator and weather (if done on the same day) that truly shows the percentage power and torque increase.

It's fine if the tuner has an in house state of the art environmentally controlled dynamometer as good as the manufacturer's where all their development work is undertaken

Sadly many dyno's are in garages affected by climatic conditions etc etc etc but even so the % differences should not be much.

A better test may well be rolling start 50 to 160km.

The first diesel car (of my own) which I did dropped from 30seconds 0-100mph down to 19/20 seconds... !

"wanted" -- "Test Drivers" -- LOL