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Old June 2nd, 2017, 12:59   #48
Layerz
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Join Date: Feb 2007
Location: Leicester
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Quote:
Originally Posted by eddie_1 View Post
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.)
http://www.ross-tech.net/vag-com/examples/dynoplot6.xls

Here he explains how the math is done:
https://www.audiworld.com/forums/vag...tions-2580766/

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.

https://www.youtube.com/watch?v=cIHmWZ1jGYo


Hrmm I'll need to go over this later - for ages I've been meaning to turn the this into something with my Arduino.

The lack and price of an AWD dyno's in my area makes measuring changes purely opinion based.

Thanks for the links and if you'd like my bits explaining I'll need to refresh exactly how we came to that as an engineer friend helped me with the spreadsheet. At the time I made that I was tinkering on the most shoe string of budgets and tbh even now I have things I'd rather spend money on then full VAGCOM.
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