Calculate fuel injector scaling factors for ECU tuning when changing injector size, fuel pressure, or fuel type.
Input Parameters
Results
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Injector Size Ratio
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Pressure Flow Ratio
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Total Scaling Factor
--
New Pulse Width Factor
x
Note: After scaling, fine-tune with wideband O2 feedback. Dead-time (offset) values must also be updated for the new injectors and operating voltage.
Reference
Size Ratio = New Injector / Old Injector
Pressure Ratio = sqrt(New Pressure / Old Pressure)
Total Scale = Size Ratio x Pressure Ratio
New Pulse Width = Old PW x (1 / Total Scale)
Injector flow proportional to sqrt(pressure)