:::RHMT::: Real Home Made Turbo

General Category => Forced Induction => Topic started by: ktown powder coating on May 17, 2010, 07:34:43 AM

Title: help with RRFPR
Post by: ktown powder coating on May 17, 2010, 07:34:43 AM

I am trying to setup the fuel pressure using the Begi RRFPR and this is the equation they give to set it up.
I do not understand they they got the 1.41 number for the boost pressure ratio for in the expamle?  is this a static number or a calulated number??

Pressure calculation: the fuel pressure required increases with the square of the boost pressure ratio:
Example: 6 psi boost is a pressure ratio of 1.41. With stock fuel pressure of 36 at zero boost, than:
Needed fuel pressure = ( PR2 x 36) + boost = (1.412 x 36) + 6 = 77.5 psi

Title: Re: help with RRFPR
Post by: superdaveosbourne on May 17, 2010, 12:59:21 PM

Mike, 0 psi of boost is a pressure ratio of 1 (1 atmoshpere in BAR)

6 psi / 1 BAR (14.5 psi) = 0.41, then add the 1 bar of atmospheric pressure and you get 0.41 + 1 = 1.41

Take whatever boost pressure you want, find the pressure ratio and put it in the formula.

Example:
8 psi / 14.5 psi = 0.55 BAR

0.55 BAR + 1 BAR = pressure ratio of 1.55 (PR2 in your formula)

Title: Re: help with RRFPR
Post by: ktown powder coating on May 17, 2010, 01:24:19 PM

Thanks Dave... I had found that out on the web this morning after I osted this just forgot to come and update.

Title: Re: help with RRFPR
Post by: superdaveosbourne on May 17, 2010, 01:37:18 PM

No worries, now get it sorted out and come to the track on the 31st, bitch.

Title: Re: help with RRFPR
Post by: SloS13 on May 20, 2010, 10:40:30 PM

653x + 9 (pi^62.5)

math is for fags