Calculate HP with LogFile

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unicornux

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	Calculate HP with LogFile « on: May 08, 2020, 03:49:22 AM »

Hi guys.
how i can calculate hp with my log file. actually what is hp formula and which parameter needs to calculate hp?
thanks


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Sandstorm3k

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	Re: Calculate HP with LogFile « Reply #1 on: May 08, 2020, 04:21:58 AM »

Quote from: unicornux on May 08, 2020, 03:49:22 AM

Hi guys.
how i can calculate hp with my log file. actually what is hp formula and which parameter needs to calculate hp?
thanks

I'm not an expert, but calculating HP is just a sum of torque and RPM. I think you calculate HP at the crank with this formula, but correct me if i'm wrong. If you are interested in the logic behind is i suggest you to just google, plenty of good articles explaining it more in depth.

Formula:
HP = Torque x RPM ÷ 5252


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unicornux

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	Re: Calculate HP with LogFile « Reply #2 on: May 08, 2020, 05:27:54 AM »

Quote from: Sandstorm3k on May 08, 2020, 04:21:58 AM

thanks. but i must calculate Torque in this way.
i want calculate with car log file.


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Auriaka

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	Re: Calculate HP with LogFile « Reply #3 on: May 08, 2020, 05:40:42 AM »

Download ecuxplot, open your file...
Assuming you have correct values loaded and set to log.... enter weight of your car, and calculate the rpm/mph factor using a gear ratio calculator.

Will need your tire radius, final drive, gear ratio for the gear that you are in.
Log must be of a good pull.

The correctness of these numbers is paramount to accuracy.


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unicornux

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	Re: Calculate HP with LogFile « Reply #4 on: May 08, 2020, 05:46:43 AM »

Quote from: Auriaka on May 08, 2020, 05:40:42 AM

so, the ecuxplot calculate hp with only rpm and weight and tire radius? no more needed?


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nyet

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	Re: Calculate HP with LogFile « Reply #5 on: May 08, 2020, 11:03:29 AM »

Quote from: unicornux on May 08, 2020, 05:46:43 AM

so, the ecuxplot calculate hp with only rpm and weight and tire radius? no more needed?

and frontal area, c/d


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unicornux

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	Re: Calculate HP with LogFile « Reply #6 on: May 09, 2020, 12:56:16 AM »

Quote from: nyet on May 08, 2020, 11:03:29 AM

and frontal area, c/d

thanks.
what about drivetrain?
can you explain me about it? how i can compute drivetrain(driveloss)?


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nyet

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	Re: Calculate HP with LogFile « Reply #7 on: May 09, 2020, 08:27:43 AM »

Quote from: unicornux on May 09, 2020, 12:56:16 AM

thanks.
what about drivetrain?
can you explain me about it? how i can compute drivetrain(driveloss)?

You don't. It's a guess. In any case, nobody cares about that, wheel hp is all that matters anyway.


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unicornux

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	Re: Calculate HP with LogFile « Reply #8 on: May 09, 2020, 11:43:32 PM »

Quote from: nyet on May 09, 2020, 08:27:43 AM

You don't. It's a guess. In any case, nobody cares about that, wheel hp is all that matters anyway.

ommm. so, but you assume this value is 25 in ECUxplot. why? no matter?

and also according to the your code on github it's seems you calculate HP as follow:
whp = g * speed * mass
hp = whp / driveloss
Huh

is this correct?


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