From: Jim Bailey [jim@928intl.com]
Sent: Thursday, September 19, 2002 9:10 PM
To: 928
Subject: [928] Re: Supercharged 88s4 - RRFPR

Often the rising rate fuel pressure regulator is plumbed in series with the
stock fuel pressure regulator so under "normal" driving the stock unit is in
control but under midrange and boosted conditions the second RRFPR kicks in
and limits the amount of fuel bypassing the regulators increasing pressure .
The injection brain expects to see higher intake pressures (less vacuum)
when the butterfly is wide open but with forced induction under part
throttle conditions it can easily have high intake pressures ( no vacuum )
or some boost . There is a lot going on !

Jim Bailey
928 International
Jim@928intl.com
www.928intl.com
(714)632-9288