Need help understanding duty cycle

s300 and SManager software questions & answers
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2x0
Posts: 91
Joined: Sat Feb 04, 2017 6:51 pm

Need help understanding duty cycle

Post by 2x0 »

At 6300rpm I am at 13.77ms injector pulse and 72% duty cycle at full boost.

Is there an equation to figure out maximum pulse at 8000rpm, or better yet what my estimated duty cycle at 8000rpm would be assuming the same pulse width?

I know there is a relation between injector ms and rpm, just want to make sure I am doing it right so I don't run out of injector during a pull.

Thanks,
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28
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Hondata
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Re: Need help understanding duty cycle

Post by Hondata »

duty cycle = injector duration * rpm / 1200

So if your pulse width is the same but the rpm is 8000 rpm then duty cycle = 8000 x 13.77 / 1200 = 92%

Or you could calculate 1200 x 100% / 13.77 = 8700 rpm = 100% duty cycle
Hondata
2x0
Posts: 91
Joined: Sat Feb 04, 2017 6:51 pm

Re: Need help understanding duty cycle

Post by 2x0 »

Awesome info, thank you!
'91 CRX, B18c1, T3/T4, 17psi on e85, FIC 1000cc's, S300 V3 P28
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