Injector Duty Cycle

[CRTD]

Is there a general rule of thumb as far as accepted maximum injector duty cycle before larger injectors are required for any engine/pcm? Or is it model specific?

[Google]

Is there a general rule of thumb as far as accepted maximum injector duty cycle before larger injectors are required for any engine/pcm? Or is it model specific?

I change them when Duty Cycle is over 80%.





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[Russ K]

My injector duty cycle is 95+% with stock injectors. Some stock GM vehicles are over 80%, no issues at all. Tuned a 2004 GTP with a smaller pulley, the injector duty cycle hit 110% at 11.5 AFR.

Russ Kemp