Increasing fuel pressure

[Axel Rietschin]

What you want is maintain a constant relative pressure between the fuel and
the manifold. Say your base fuel pressure is 300KPa. The regulator thus give
you 300Kpa fuel pressure at 100KPa manifold pressure. At 200KPa in the
manifold the fuel pressure will be 400KPa etc, in order to maintain the
200KPa differential pressure the injectors like to see. In this example if
you have 50KPa manifold pressure at idle, the fuel pressure should be
250KPa, in short the regulator should follow the manifold pressure 1:1, that
gives you one less thing (flow vs. MAP nonlinearity) to worry about when
setting up your fuelling, assuming you have full control over it.

HTH,
Axel

----- Original Message -----
From: "Steve Spiers" <s.spiers at xtra.co.nz>
To: <diy_efi at diy-efi.org>
Sent: Sunday, October 28, 2001 00:48
Subject: Increasing fuel pressure


>
> Hi
>
> I want to install an adjustable rising rate fuel pressure regulator. There
are a
> few different brands, Malpassi, FSE etc. They all look the same and I
think they
> are just branded differently. I have access to a Malpassi.
>
> Anyway, I have not been able to find any information of how adjustable or
how
> much of an incresing rate they have. Ive calculated (guessed) that I need
around
> 5 bar fuel pressure at 30psi absolute manifold pressure. If it was set up
like
> this (if at can be) what does this give me at idle (20in/hg) and say 1 bar
> absolute? I would assume the pressure at idle has to be increased
somewhat, lets
> say 10psi? At +10psi, there should be enough adjustment to achieve a
correct
> idle mixture, but if the fuel pressure has too much higher than that I
think I
> will run out of adjustment. Im not really a fan of adjusting the AFM
spring
> tention. Thoughts?
>
> Steve
>
>
> --------------------------------------------------------------------------
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