wow so its better to run @50 vs the stock 28psi, this is
getting interesting, does anyone have a mod right up on
adding this? or some screen shots?

thanks much
Joe

On 06 May 2003, Robert Lilley wrote:

> True the ECU will try to compensate for rich
> or lean conditions via the O2 readings. Only
> problem is in a lower pressure FI there is
> less time to compensate for a lean condition
> during a cycle as compared to a higher
> pressure FI.
>
> The pressure is stock at lower RPMs and
> loads and during greater loads or higher
> RPMs where is more fuel is needed, it is
> available so the engine can get what it
> needs in a shorter pulse rather than going
> lean. When I was running an adjustable fuel
> pressure regulator, to get it to run good at
> the upper RPMs I had to turn the pressure
> up, but the lower pressure was too high, to
> fix the lower pressure the upper PSI was too
> low. I also found out that the AFPR would
> not limit the low pressure under
> acceleration and dropped down to 20 PSI
> creating a lean condition whereas the stock
> FPR limited the low to 28 PSI.
>
>        In doing some research for a problem, I
>        ran across articles about the Digifant
>        that indicate that the system tends to
>        run lean under hard acceleration and in
>        the upper RPMs. I might try this in the
>        near future to see if it helps.
>
> Others on the list have reported in the past
> that they have turned the fuel pressure up to
> @50 PSI and the engine runs better.
>
> Robert