# 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:** 12

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### Author: ![Fry](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fry/32/7284_2.png) [@Fry](https://forums.speedlife.net/u/Fry)
#### Post date: [March 14, 2008, 5:38am UTC](https://forums.speedlife.net/t/dyno-ing-your-car-w-o-a-machine/44986/12 "2008-03-14T05:38:34Z")

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Only taking into account acceleration and drag:

F=m((v2-v1)/t) + .5_rho_v^2_A_Cd

Good luck getting any sort of accuracy out of it.

Well, that just gives you average force and at this point I’ve lost interest.

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