[martin]

am i right in thinking that the standard fuel pressure in the rail is 2.5 bar at idle.??

 

[DarrenH]

will be less at idle i think, because its rising rate.

 

[Russ]

Take the vacuum connection off to measure it....

 

[martin]

fp, with pipe off???

 

[DarrenH]

its a rising rate pressure regulator, it has a vacuum feed on top so that when vacuum is greatest (idle) it will hold back pressure, and when vacuum is at its least (wide open throttle) the fuel pressure will be at max, taking the vacuum hose off the top will emulate wide open throttle, and give you max pressure.

 

[Cemesis]

Interesting. So at idle, would it be fair to say that the pressure will be pretty much the same irrelevant of the pressure at WOT?

So an XE idling should need no higher fuel pressure than a Phase 3 LET?

Right? Wrong?

 

[jimjimmas]

Doesn't the XE have a 3 bar pressure regulator and the LET a 4 bar regulator. But at phase 3 the LET would use a 4.5 bar regulator (With standard injectors).
I thought the rising rate regulators were an upgrade.

 

[DarrenH]

So an XE idling should need no higher fuel pressure than a Phase 3 LET?

Right? Wrong?

logically yes

Doesn't the XE have a 3 bar pressure regulator and the LET a 4 bar regulator. But at phase 3 the LET would use a 4.5 bar regulator (With standard injectors).
I thought the rising rate regulators were an upgrade.

XE had 2.5 (up to 93) and 3.0 (93 on) LET had 3.0

 

[martin]

i am utterly bubberly .must be my age. i have a fse with a gaudge on, need a figure at idle.

 

[DarrenH]

have you hooked up the standard vacuum feed to the little nub next to the adjuster nut ?

If so, pull that off for a second, start engine, set to 2.5 bar (36.25 psi) if you have cream coloured injectors, or 3 bar (43.5psi) if you have blue injectors. lock off the adjuster, replace vacuum hose on nub.

 

[martin]

yes i'm useing the standard vacume pipe, thanks for your advice.

 

[DarrenH]

you gonna get it on a rolling road to play with a bit more pressure ?

 

[martin]

thats one thing its never had, i'm allways talking about but i never get around to it, plus it was chipped when i bought it some six years ago. good idea, if i can find a good garage.

 

[DarrenH]

well otherwise it seems pointless to have an FSE if your gonna run it at stock fuel pressure.

 

[martin]

true