Injector size change. Help me math
03-25-2019, 06:27 PM
#1
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Location: Grand Rapids, MI
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Injector size change. Help me math
Old injector at old fuel pressure: 1265cc
New injectors at new fuel pressure: 2255cc
78.5% increase in injector flow
Base fuel table only-
My tuner says to multiply my current base fuel table by 0.569
I think I need to multiply it by 0.215
Whos right? Or neither?
New injectors at new fuel pressure: 2255cc
78.5% increase in injector flow
Base fuel table only-
My tuner says to multiply my current base fuel table by 0.569
I think I need to multiply it by 0.215
Whos right? Or neither?
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03-25-2019, 07:04 PM
#7
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Location: Sunnyvale, CA
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Your new injectors flow 78% more than your old one. IOW, you take your old injectors and multiply by 1.78 to get the flow of your new injectors. Thus, you need to divide your fuel map by the same 1.78 to keep the same flow. Or, you can multiply it by ~0.561. Same thing.
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03-26-2019, 01:20 AM
#12
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AEM Gen1 does not either, they both use raw pulsewidth. Granted, the AEM also has a tool which allows you to quickly rescale the fuel map for injector and/or pressure changes. I forget if Hydra has something similar.
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03-28-2019, 05:34 PM
#16
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The first basemap that FM sent to me was set up as PW so thats just what I've always used. Its the first and only ecu I've ever played around in. I make fuel adjustments and its always worked out so if its not broke I don't fix it
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