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Title: Butt Dyno Post by: bazaa on May 20, 2011, 11:50:29 AM Has anyone tried this
as seen here http://forums.audiworld.com/showthread.php?p=22358766 just wondering how accurate have you found it compared to being on the rollers ? Title: Re: Butt Dyno Post by: nyet on May 20, 2011, 01:13:36 PM Has anyone tried this as seen here http://forums.audiworld.com/showthread.php?p=22358766 just wondering how accurate have you found it compared to being on the rollers ? Depending on the algorithm and the accuracy of inputs, it can be very close (sometimes better, since it reflects REAL road whp) I have my own here http://nyet.org/cars/ECUxPlot Title: Re: Butt Dyno Post by: nyet on May 20, 2011, 01:15:55 PM Has anyone tried this as seen here http://forums.audiworld.com/showthread.php?p=22358766 just wondering how accurate have you found it compared to being on the rollers ? LOL I just looked at this. Its a *SPREADSHEET* macro hilarious. Microsoft really has made us into a world of morons. Title: Re: Butt Dyno Post by: bazaa on May 21, 2011, 07:51:19 AM nyet ,Thank you for your reply
you need a bloody long stretch of road to do this properly and forget the local speed limits ;D I am quite impressed by your graphs 8) Cheers Barry Title: Re: Butt Dyno Post by: vtraudt on July 22, 2011, 05:09:04 AM Quote how accurate have you found it compared to being on the rollers ? Depending on the algorithm and the accuracy of inputs, it can be very close (sometimes better, since it reflects REAL road whp) First: Any roller is just trying to duplicate the real thing. So by definition, it is at best a close approximation. Using time, speed and distance measurements will provide the best and most direct description of the vehicle dynamics, including acceleration (deceleration if you want), power and (wheel) torque. Included are drivetrain losses (as with roller dynos), but also wind resistance, actual vehicle weight, etc. The reasons this method is not the ONLY one being used by tuners, users, etc: - vehicle is mobile (so all secondary test equipment has to be dragged along) - test conditions are harder to control (climate, road surface) - results are even less comparable from one vehicle to the next as with Dynos (which are all over the place as well). Title: Re: Butt Dyno Post by: cordobe1 on July 22, 2011, 04:46:45 PM Has anyone tried this as seen here http://forums.audiworld.com/showthread.php?p=22358766 just wondering how accurate have you found it compared to being on the rollers ? Depending on the algorithm and the accuracy of inputs, it can be very close (sometimes better, since it reflects REAL road whp) I have my own here http://nyet.org/cars/ECUxPlot Very Good info! tnks for share!! ;D |