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Old June 2nd, 2017, 10:04   #47
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Join Date: Dec 2004
Location: Hannover, Germany formerly Toronto & NY

Originally Posted by Layerz View Post
Nice, how did you plot the Butt Dyno? I have a spread sheet I've used before that's fun with my VCDS laggy inputs - need to average some groups.
Hi, The spreadsheet I used orginated from Rosstech themselves. I think one of their guys put it together. (I tried a couple of other freebies but did not look right.)

Here he explains how the math is done:

Basically you do an acceleration followed by coasting to subtract the losses. I found in 3rd gear the results were smoother.

The Insoric method I think is no different except their uProc based sensor on the wheel is very very accurate to get the revs upto 1KHz sampling and then to calculate the speed. The more accurate the speed through higher sampling the better the power prediction according to the polytechnic prof that developed Insoric in Switzerland. Here is his pitch (unfortunately in german). As usual they want a suitcase full of money for the sensor.
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Last edited by eddie_1; June 2nd, 2017 at 10:34.
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