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Old Jan 7, 2002, 01:55 PM
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fuel pressure

how do i calculate by how much i should lower the fuel pressure to keep the same fueling but with 680cc injectors ????
Old Jan 7, 2002, 03:53 PM
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phhhhhh, way over my head... or wait:
if you take the old one as 100% and see the difference in percentage to 680cc, that could be the percentage that you need to lower pressure by.

This could be fully wrong, but I think it's a linear formula, if I remember correctly from my school days.... don't want to look in my Physics formula book... too many bad memories...
Old Jan 10, 2002, 07:23 AM
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std injectors 560cc/min your larger ones are 680cc/min.

pressure drop is proportional to velocity (flow through fixed size pipe) squared.

hence if flowrate is increased through larger injectors by 21% then you will need to drop pressure 47% to maintain the same flowrate as through the smaller injectors.

probably

I would suggest getting a decent lambda sensor and a rolling road to set it up properly.
Old Jan 10, 2002, 11:34 AM
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but what if 47% less is below 3 bar

this is base pressure ,yes ?




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