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Location:
Gold Coast
Registered:
June 2004
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Fuel system questions
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Tue, 21 June 2005 13:09
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Hi,
I wanted to know how to figure out what fuel pump I need. I want to "max out" my 2jz injectors (gray top 440cc's). I was looking at a walbro 255 job but have no idea how to work out if the 255 liters per hours is more or less than the injectors could use at 100% duty cycle.
Any takers?
Thanks
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Location:
Brisbane
Registered:
February 2003
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Re: Fuel system questions
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Tue, 21 June 2005 14:06
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Changing the fuel pump will not affect the output of the injectors.
You'd have to change the fuel pressure regulator to affect fuel 'thru-put'. Doing what you're proposing will mostly result in the engine running excessively rich (except when trying to cruise) and not noticably producing any more power.
You'd be better-off running a tunable ECU and sizing the injectors to suit your power requirements, you'd also want to avoid running injectors at a 100% duty cycle.
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Location:
Toronto, Downtown
Registered:
September 2004
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Re: Fuel system questions
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Tue, 21 June 2005 14:10
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agreed no marjin for error at 100% duty it goes a little lean and booom!!!
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Location:
Gold Coast
Registered:
June 2004
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Re: Fuel system questions
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Tue, 21 June 2005 15:13
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My current fuel pump can't pump enough fuel out to satisfy the injectors. I need to know if the walbro will. Does that make it more sense?
And what I was trying to get at with the injectors is will the fuel pump be able to supply enough fuel to do this, I'm not actually going to do this.
The injectors are being controlled by an SAFC II, and cant get the most out of the setup because of the stock fuel pump
*This is all on a 1JZ
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Location:
sunny coast, qld
Registered:
October 2002
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Re: Fuel system questions
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Tue, 21 June 2005 22:39
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Yes a 255L/hr pump will be enough.
255/60 = 4.25L/minute
440cc inj X6= 2.64L/minute
I think that is all there is to it. As long as enough fuel can be returned to the tank, all should be good.
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