How much fuel pressure in our fuel lines? Billy T?

645 Views 7 Replies 4 Participants Last post by TyrolSport, Feb 12, 2002

drm916

Discussion Starter · Feb 11, 2002

I guess I could get a gauge and find out the actual number...but maybe some of you guys have already done this.......if so please post your numbers in psi
???

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Re: How much fuel pressure in our fuel lines? Billy T? (drm916)

with no vac attached it should be 3bar, Eg about 44psi. figure 5-8psi less with vac. What line are you trying to tap into the fuel rail?
-Mike P

[Modified by tyrolkid, 1:36 PM 2-11-2002]

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TyrolSport

· #7 · Feb 12, 2002

Re: How much fuel pressure in our fuel lines? Billy T? (wolfsburg_de)

quote:[HR][/HR]It should also rise as boost increases, right? So:
3 bar * 14.7 psi = 44.1 psi
with 1 bar of boost:
4 bar * 14.7 psi = 58.8 psi[HR][/HR]

That assumes the regulator is 1:1 boost referenced. Actual pressure at the injectors must be reduced by level of boost present in the intake manifold........10lbs of boost in intake manifold reduces actual pressure by approximately the same amount.......

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TyrolSport

· #8 · Feb 12, 2002

Re: How much fuel pressure in our fuel lines? Billy T? (wolfsburg_de)

quote:[HR][/HR]I'm not sure I follow. If the fuel pressure goes down as the boost goes up, then there is less differential pressure across the injector, so less fuel gets into the intake runners for a given injector pulse width.[HR][/HR]

Bump the pulsewidth or use a regulator higher than 1:1....

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