How do I calculate my injector duty cycle??
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Joined: Dec 2000
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From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
How do I calculate my injector duty cycle??
I know the calculation has something to do with the injector pulse width and some other number. I need to find out if I'm maxing out my injectors or not. Thanks in advance.
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Re: How do I calculate my injector duty cycle??
Originally posted by 86TpiTransAm
I know the calculation has something to do with the injector pulse width and some other number. I need to find out if I'm maxing out my injectors or not. Thanks in advance.
I know the calculation has something to do with the injector pulse width and some other number. I need to find out if I'm maxing out my injectors or not. Thanks in advance.
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Joined: Jan 2001
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From: Denver, CO
Injectors fire every four ignition pulses (I'm pretty sure of that) or once every engine revolution.
So at 600 RPMs, or 10 revolutions per second, the injectors fires every 100 milliseconds. If the pulse width is 2 milliseconds, then you have 2% duty cycle (2/100).
At 3000 RPMs, or 50 revolutions per second, the injectors fires every 20 milliseconds. If the pulse width is 5 milliseconds, then you have 25% duty cycle (5/20).
At 6000 RPMs, or 100 revolutions per second, the injectors fires every 10 milliseconds. If the pulse width is 9 milliseconds, then you have 90% duty cycle (9/10).
Most injectors with max flow at 80-90% duty cycle, especially at higher RPMs.
So at 600 RPMs, or 10 revolutions per second, the injectors fires every 100 milliseconds. If the pulse width is 2 milliseconds, then you have 2% duty cycle (2/100).
At 3000 RPMs, or 50 revolutions per second, the injectors fires every 20 milliseconds. If the pulse width is 5 milliseconds, then you have 25% duty cycle (5/20).
At 6000 RPMs, or 100 revolutions per second, the injectors fires every 10 milliseconds. If the pulse width is 9 milliseconds, then you have 90% duty cycle (9/10).
Most injectors with max flow at 80-90% duty cycle, especially at higher RPMs.
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