Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Johnny English]

Upgrade : in case of cold start fuel pressure is rising up to 3bar engine fires at this point, in case of warm start it is firing at 2,8bar, to hold an average run 2,3bar enough ( based on the meter, which is not surely an exact value)

[Abiton]

I thought fuel pressure in the rail was regulated to be a constant pressure relative to intake manifold pressure. This way the pressure difference across the injectors is constant, and fuel delivered per unit time predictable.

So it will be lower at idle than at WOT.
 

You would think so........

but the pressure pipe goes to a tapping on the underside of the throttle bodies so who knows what that does to your fuel pressure when you press the throttle

A belated apology for the bum steer on this issue from me.  I've just worked out why I made this mistake, FWIW. On the 2.0 it is manifold vac referenced, as evidenced by this piccy of the feed (bottom of pic) going to the top of the inlet manifold:


Not sure whether 2.2 is same?