Quote:
Originally Posted by Chillerman
Linn,Not trying to start an argument here. I would like to know how you know how much brake pressure to put on the dyno to simulate the weight of the vehicle being tested? Also is the wind resistance calculation a fixed number or is it a variable in the program? Can the dyno discern between slicks, drag radials, or street tires? I do realize that you have an eddy-current dyno which is state of the art equipment. I know what eddy-current equipment is since I'm exposed to it every winter in my line of HVAC work so we can test the integrity of the copper tubes in water cooled industrial centrifugal chillers.
If there are variables in your computer models, then I would think you could make whatever predictions you want about track performance. I'm a firm believer in test&tune at the track, but also a believer in tuning your vehicle for the mods it has. But track testing is the only way to know what the vehicle is capable of.
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the weight is entered into the computer before the dyno tuning session starts..the drag coefficient is generated by the computer for the weight of the vehicle..whatever is on the vehicle will either spin the rollar or not spin it.. so whether it has slicks,radials or street tires if it spins the rollar will not turn and this will effect the results..
Mustang Dyno makes the computer progams by the model.. if the model changes then they have to update for the shape of the body.. so there are different drag coeffients for different body models
if you have any more questions about how this works you can contact MD and get more detailed info from them..
we bought a new dyno about a year ago.. it has a single rollar with a built in weather station..it also has a tie down under the vehicle in the middle of the axle to help eliminate wheel spin on high hp vehicles... it is very stingy on the results and more consistant than our old dyno that had 2 rollars and no built in weather station..
according to MD any dyno result can be manipulated.. even from an inertia dyno
I agree that track results are generally thought of as a better way to test results but there are also variables involved at the track that can effect the outcome.. and many people will never take their vehicle down a track so they need a way to measure results other than a track run..