# i can't wait to hit the dyno

**URL:** <https://forums.speedlife.net/t/i-cant-wait-to-hit-the-dyno/27605>\
**Category:** NYSpeed Automotive\
**Created:** [April 13, 2007, 5:15pm UTC](https://forums.speedlife.net/t/i-cant-wait-to-hit-the-dyno/27605 "2007-04-13T17:15:12Z")\
**Posts on this page:** 1\
**Showing post:** 46

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**Author:** ![MPD47](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mpd47/32/7383_2.png) [@MPD47](https://forums.speedlife.net/u/MPD47)\
**Post date:** [April 15, 2007, 5:14pm UTC](https://forums.speedlife.net/t/i-cant-wait-to-hit-the-dyno/27605/46 "2007-04-15T17:14:12Z")

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[quote=“somedude,post:43,topic:27605"”]

how would you calculate crank HP without pulling the engine? I know crank HP is basicly a useless value because it doesn’t represent usable power but how would you do it. I have always herd 15% for MTX and 20% on ATX is that way off?

[/quote]

Crank horsepower other than on an engine dyno is a useless estimation.

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