Ron wrote,
>On the systems I have worked on the MAP sensor is what is used to
>control fuel pressure to the injectors. If positive manifold pressure
>is registered the fuel pressure will automatically compensate to provide
>the same flow. On the fuel injection systems I have worked on this is
>all that is used to control fuel pressure. On other turbo applications
>I have done I have done the exact same thing you are saying, by
>referencing the fuel pressure regulator to manifold pressure to
>automatically compensate for positive pressure. I believe we are
>talking about the same thing here
On contemporary injection control systems, MAP is an electrical
device that reads the absolute manifold pressure "vacuum" and
converts that signal into a 0 to 5vdc signal, 4.7v meaning 1ATM.
MAP stands for manifold air pressure, and is used on speed
density "non MAF[mass air flow]" systems for use as the first order
control elements.
The Fuel pressure regulator,mechanically reads the fuel rail pressure,
and dumps off surplus pressure to recycle back to the tank and pump.
The Holley TBI systems dont have a differential pressure regulator
as port type do, this is because TBI systems inject into atmospheric
pressure, and not into a varying vacuum level as do port type.
Anyhow, if you are serious about wanting to use the Holley or
even the OEM rochester pieces used on the 4 cyl GM cars,
get some, they are dirt cheap, CAN be made to work even with
all the boost you can make.
Jarrid Gross
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 10:18:51 CDT