Nitrous engines
Duty cycle is injector "on" time. The ecu times each injection event with the intake charge pulse and valve opening. When you start to run an injector above 50% it will be spraying fuel when the valves are closed. Its not to big a deal as TB systems do that all the time but it not a efficient as tuned port system. Its not good to be blasting fuel into a closed intake valve. Many times on the 50hp+ engines you need to make a huge change in fuel settings to get even the slightest change in afr with the stock injectors. This is most likely the cause.
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wayneschofield
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QUOTE (wistech @ Nov 15 2007, 12:23 AM) <{POST_SNAPBACK}>
Many times on the 50hp+ engines you need to make a huge change in fuel settings to get even the slightest change in afr with the stock injectors. This is most likely the cause.
I suspect you're getting into the region of 'injector dead time', the difference between opening signal duty and actual injector spray time, the two are not the same.......