fuel pressure at idle for stage 3 2wd
25-07-2004, 01:51 PM
#1
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fuel pressure at idle for stage 3 2wd
hi,
does any one know what sort of fuel pressure i should be running after the regulator at idle,
cheers
does any one know what sort of fuel pressure i should be running after the regulator at idle,
cheers
26-07-2004, 10:00 AM
#6
Testing the future
Taken from the YB Engine Manual, now online complete at:
https://passionford.com/forum/viewtopic.php?t=63047
or the section on Fuel System
https://passionford.com/forum/viewtopic.php?t=63065
The Pressure Regulator
Does that mean that the fuel pressure should always be 3 bar above the manifold pressure to maintain a constant 3 bar difference across the injector? i.e. at 1 bar boost, fuel rail pressure = 4 bar?
or is the rail pressure 3 bar with the pressure reg feed disconnected but it is modified in a non linear way by the pressure feed and the diaphragm?
as i understand it, it is always a 3 bar difference. but you can up the fuel pressure slightly to gain more flow out of the injectors and hence run a bit more boost than normal (to be checked by WB AFR)
https://passionford.com/forum/viewtopic.php?t=63047
or the section on Fuel System
https://passionford.com/forum/viewtopic.php?t=63065
The Pressure Regulator
To ensure accurate fuel metering and extend the capacity of the injectors it is necessary to reduce the fuel rail pressure at idle and low power usage whilst increasing the fuel rail pressure under boost conditions. This is achieved by feeding a inlet manifold pressure signal to the fuel pressure regulator:
The Fuel Injector
The injectors are solenoid operated valves.
The quantity of fuel injected depends only on injector open time and fuel rail pressure.
Injection is in a cone shape and the feed pressure 3,0 bar (modified by manifold pressure acting on the diaphragm of the pressure regulator), sufficient to cause a very fine spray.
The Fuel Injector
The injectors are solenoid operated valves.
The quantity of fuel injected depends only on injector open time and fuel rail pressure.
Injection is in a cone shape and the feed pressure 3,0 bar (modified by manifold pressure acting on the diaphragm of the pressure regulator), sufficient to cause a very fine spray.
Does that mean that the fuel pressure should always be 3 bar above the manifold pressure to maintain a constant 3 bar difference across the injector? i.e. at 1 bar boost, fuel rail pressure = 4 bar?
or is the rail pressure 3 bar with the pressure reg feed disconnected but it is modified in a non linear way by the pressure feed and the diaphragm?
as i understand it, it is always a 3 bar difference. but you can up the fuel pressure slightly to gain more flow out of the injectors and hence run a bit more boost than normal (to be checked by WB AFR)
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28-07-2004, 08:11 PM
#12
Testing the future
3.5 bar above manifold pressure. so at idle it should be around 3 bar, and at 1 bar boost it should be about 4.5 bar. that's my understanding anyway. hope i'm right.
28-07-2004, 08:21 PM
#13
Hi,
If you have a fuel pressure gauge, and TC pressure gauge, you can read :
on idle, manifold pressure = - 0.8 ; fuel pressure = 2.7 (total = 3.5)
on cruising, manifold pressure = 0 ; fuel pressure = 3.5 (total = 3.5)
on charge, ie manifold pressure = 1.1 ; fuel pressure = 4.6 (total = 3.5)
Fuel pressure on the injector noze should be always 3.5 bars.
Regards.
If you have a fuel pressure gauge, and TC pressure gauge, you can read :
on idle, manifold pressure = - 0.8 ; fuel pressure = 2.7 (total = 3.5)
on cruising, manifold pressure = 0 ; fuel pressure = 3.5 (total = 3.5)
on charge, ie manifold pressure = 1.1 ; fuel pressure = 4.6 (total = 3.5)
Fuel pressure on the injector noze should be always 3.5 bars.
Regards.
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