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Question on fuel injectors and fuel pressure.....

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Old 01-16-2002, 08:20 PM
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Default Question on fuel injectors and fuel pressure.....

When you calculate the fuel flow of an injector at a certain pressure, do you use just the fuel pressure, or fuel pressure minus intake pressure?

For example:
A 240cc/m injector at 90 psi fuel pressure at 15psi of boost.
Should it be calculated as 240cc/m @ 75psi or 90psi?
Old 01-16-2002, 08:58 PM
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Default when people say fuel pressure they're referring to relative pressure.

So manifold pressure is already accounted for. You want to use the relative pressure to calculate flow.
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