Calculate HP base on OBD II data? - G35Driver - Infiniti G35 & G37 Forum Discussion

Apr 7, 2004 | 11:00 AM

god_of_cpu

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Calculate HP base on OBD II data?

Anyone know how to "approximate" the horse power based on OBD II data?

I'm writing my own OBD software and I want to calculate HP similar to how Digimoto (http://www.digimoto.com/demos/dyno/dyno.htm) calculates HP.

Apr 10, 2004 | 12:58 PM

Q45tech

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From: Marietta, Georgia

Re: Calculate HP base on OBD II data?

You can approach the problem by using air flow---how much air does it take to make a HP, but that needs to ASSUME efficiency. 255 grams per second could make 290-330 HP. But how much is lost after flrwheel is of course variable.

http://www.ws6.com/ramtest.htm.

My guess is they just use calculus to measure the rate of speed changes in 0.001 second steps [vehicle weight and gearing].