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Author Topic: How to measure BHP through intake mass?  (Read 1161 times)

Offline scopes

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How to measure BHP through intake mass?
« on: October 24, 2013, 05:32:11 pm »
Hi Guys

I remember reading about intake mass and there was a calculation to work out the bhp figures, if anyone could shed any light on this, that would be great !

just cant find where I read it on the forum  :confused:

thanks
Neil

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Offline rich83

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Re: How to measure BHP through intake mass?
« Reply #1 on: October 24, 2013, 05:38:25 pm »
4th gear pull.... take the maximum value and divide it by 0.8
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Offline Homer

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Re: How to measure BHP through intake mass?
« Reply #2 on: October 24, 2013, 05:58:37 pm »
What the fudge is intake mass?
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Offline rich83

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Re: How to measure BHP through intake mass?
« Reply #3 on: October 24, 2013, 06:10:45 pm »
Quote from: Homer on October 24, 2013, 05:58:37 pm
What the fudge is intake mass?

Its what is 'read' by the MAF. Its the Mass of air entering your engine per second... measured in grams per second.
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Offline Jonneh

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Re: How to measure BHP through intake mass?
« Reply #4 on: October 24, 2013, 06:47:39 pm »
Either MAF g/ps x 1.25 or MAF g/ps divided by 0.8.

 :jumpmove:
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Offline berg

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Re: How to measure BHP through intake mass?
« Reply #5 on: October 24, 2013, 09:26:24 pm »
its not totally accurate though is it, but a rough guide
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Offline Jonneh

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Re: How to measure BHP through intake mass?
« Reply #6 on: October 31, 2013, 07:13:59 pm »
Quote from: berg on October 24, 2013, 09:26:24 pm
its not totally accurate though is it, but a rough guide

I'll let you know when i get mine on a RR and see what the difference is!
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Offline jacobrownoly

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Re: How to measure BHP through intake mass?
« Reply #7 on: November 02, 2015, 01:14:57 am »
Hi, I just did a log in 3rd gear and got a max of 203.5 (ko3) stage 2+
254bhp when devided by 0.8

Might be a noob question but would a 4th gear pull not produced a higher intake mass value??
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Offline pudding

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Re: How to measure BHP through intake mass?
« Reply #8 on: November 02, 2015, 09:58:22 am »
Yeah 4th is a 1:1 gear ratio so best for power runs.   I would do 3 runs and take the average.  Ignore any ridiculously high transient peaks too.

It's a good day for it today too, lot's of foggy cooling goodness on the intercooler :)
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