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Fuel pressure regulator, vacuum reference or not??
Posted: Tue Sep 30, 2008 10:53 am
by JAM
I see that most fuel pressure regulators are vac/boost referenced, but some are not. I know that you can get more range out of the injectors if you vary the pressure, but if i plan to have a drag race (bracket race) specific application where consistency is important, will this just be adding a variable to the equation that can cause me to chase tuning parameters and decrease my consistency ??
Re: Fuel pressure regulator, vacuum reference or not??
Posted: Tue Sep 30, 2008 11:17 am
by Matt Cramer
By referencing the regulator to manifold pressure, it is better at maintaining a constant pressure drop across the injectors. While you could run it without referencing it to manifold vacuum, I don't see any benefit when it comes to consistency.
Re: Fuel pressure regulator, vacuum reference or not??
Posted: Tue Sep 30, 2008 11:41 am
by JAM
Matt Cramer wrote:By referencing the regulator to manifold pressure, it is better at maintaining a constant pressure drop across the injectors. .
Hmmmmm......... how does it do a
better job at maintaining a constant pressure drop when vac referenced as opposed to not vac referenced??
Re: Fuel pressure regulator, vacuum reference or not??
Posted: Tue Sep 30, 2008 12:05 pm
by Minami Kotaro
JAM wrote:Hmmmmm......... how does it do a
better job at maintaining a constant pressure drop when vac referenced as opposed to not vac referenced??
As manifold pressure changes, fuel pressure will change in a 1:1 ratio with it, keeping the relative pressures consistent.