# dyno-ing your car w/o a machine?

**URL:** <https://forums.speedlife.net/t/dyno-ing-your-car-w-o-a-machine/44986>\
**Category:** NYSpeed Automotive\
**Created:** [March 13, 2008, 6:18pm UTC](https://forums.speedlife.net/t/dyno-ing-your-car-w-o-a-machine/44986 "2008-03-13T18:18:10Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\
**Post date:** [March 14, 2008, 9:36am UTC](https://forums.speedlife.net/t/dyno-ing-your-car-w-o-a-machine/44986/21 "2008-03-14T09:36:22Z")

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You can find an average of the negative forces by decelerating. Take your car up to say 100mph, then at a set point let off the gas and let it cost to a stop. Time it, and take the distance it took you to stop. That will give you the average force needed to overcome to get to 100 mph approx.

F=MA  
Mass= your car  
Acceleration will be the Distance/Time

This force will include your rolling friction, air friction etc.

It will not incluse power train loss.

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