# 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:** 16

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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, 6:57am UTC](https://forums.speedlife.net/t/dyno-ing-your-car-w-o-a-machine/44986/16 "2008-03-14T06:57:37Z")

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> [@66impalass](#):
>
> probably have to take into account the air density to get a more accurate F resulting from air…

Rho sukka!

The math is easy. It’s just plain old freshman year kinematics. It’s getting accurate inputs to the variables that’s going to be hard. Well, naw maybe not that easy. Drag force will be increasing exponentially the entire time you’re accelerating. Time to do calculus. :hang:

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