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mfi question
connecting the Inlet Manifold, the press. fuel controller, Press would win more fuel when the turbo blows?
but as you could? at low rpm will rich,but high rmp will lean |
Sorry I don't understand mate, English is not good.
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Originally Posted by Karlos G
(Post 6482850)
Sorry I don't understand mate, English is not good.
my question is: I can earn more Pressure?if I connect the fuel pressure regulator, with Inlet Manifold, the mixture is lean, in the high rpm |
Post question in Spanish maybe somebody else can translate
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I think he means when you put a pipe from the fuel reg by the airflow meter onto the charge pipe
I've hear this is supposed to help with fueling under load But have never really seen any facts about It |
Originally Posted by gup
(Post 6483020)
I think he means when you put a pipe from the fuel reg by the airflow meter onto the charge pipe
I've hear this is supposed to help with fueling under load But have never really seen any facts about It |
Of course the vacuüm connection on the fuel pressure regulator must be connected to the inlet manifold. This is necessary to maintain a constant pressure difference between fuel in the fuel rail and air in the intake manifold as this is what the ecu assumes. Otherwise it will be difficult to impossible for the ecu to calculate injection times.
When not connected the mixture will be too rich with low loads (cruising at low rpm's/speed) and it will be way too lean when the turbo is active. An example (with a bit of exaggeration): Fuel pressure standard 2.5 bar. So, with the intake manifold at barometric pressure (engine off key on, or accelerating without the turbo) the difference in pressure is 2.5 bar. Now assume the turbo boost is 2.0 bar. Without correction the difference is only 0.5 bar - which means there's not a lot of fuel going into the engine. Theoretically with turbo boost at 2.5 bar or more the pressure difference is zero or negative, which means NO fuel with get into the engine, but rather air will go into the fuel rail. |
Originally Posted by ro33
(Post 6482720)
connecting the Inlet Manifold, the press. fuel controller, Press would win more fuel when the turbo blows?
but as you could? at low rpm will rich,but high rmp will lean |
Originally Posted by oldford
(Post 6483024)
Of course the vacuüm connection on the fuel pressure regulator must be connected to the inlet manifold. This is necessary to maintain a constant pressure difference between fuel in the fuel rail and air in the intake manifold as this is what the ecu assumes. Otherwise it will be difficult to impossible for the ecu to calculate injection times.
When not connected the mixture will be too rich with low loads (cruising at low rpm's/speed) and it will be way too lean when the turbo is active. An example (with a bit of exaggeration): Fuel pressure standard 2.5 bar. So, with the intake manifold at barometric pressure (engine off key on, or accelerating without the turbo) the difference in pressure is 2.5 bar. Now assume the turbo boost is 2.0 bar. Without correction the difference is only 0.5 bar - which means there's not a lot of fuel going into the engine. Theoretically with turbo boost at 2.5 bar or more the pressure difference is zero or negative, which means NO fuel with get into the engine, but rather air will go into the fuel rail. |
Turbosystems is of course correct, it should be left to atmosphere, also there are no calculated injections times.... it continuous mechanical fuel injection, the pressure is varied to adjust fuelling based on the position of the metering unit 'flap'..... the big give away is the lack of wiring to the injectors and that there is a metering unit.
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Originally Posted by Karlos G
(Post 6483324)
Turbosystems is of course correct, it should be left to atmosphere, also there are no calculated injections times.... it continuous mechanical fuel injection, the pressure is varied to adjust fuelling based on the position of the metering unit 'flap'..... the big give away is the lack of wiring to the injectors and that there is a metering unit.
Where is could regulate the pressure? the regulator screw? http://i61.tinypic.com/etact1.png this? norris says modifies the regulatory anyone know how? |
That adjusts the base fuel pressure, if adjusting the on boost fuelling then it's done on the EMFPA... but this should only be done by someone who knows what they are doing or you could destroy your engine.
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