MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: scopes on October 24, 2013, 05:32:11 pm

Title: How to measure BHP through intake mass?
Post by: scopes 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

 :happy2:
Title: Re: How to measure BHP through intake mass?
Post by: rich83 on October 24, 2013, 05:38:25 pm
4th gear pull.... take the maximum value and divide it by 0.8
Title: Re: How to measure BHP through intake mass?
Post by: Homer on October 24, 2013, 05:58:37 pm
What the fudge is intake mass?
Title: Re: How to measure BHP through intake mass?
Post by: rich83 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.
Title: Re: How to measure BHP through intake mass?
Post by: Jonneh on October 24, 2013, 06:47:39 pm
Either MAF g/ps x 1.25 or MAF g/ps divided by 0.8.

 :jumpmove:
Title: Re: How to measure BHP through intake mass?
Post by: berg on October 24, 2013, 09:26:24 pm
its not totally accurate though is it, but a rough guide
Title: Re: How to measure BHP through intake mass?
Post by: Jonneh 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!
Title: Re: How to measure BHP through intake mass?
Post by: jacobrownoly 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??
Title: Re: How to measure BHP through intake mass?
Post by: pudding 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 :)