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Old 05-19-2009   #6
Shane@DBPerformance
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Re: Tunning question

Most factory ecu mitsu dataloggers are off on their duty cycle calculation anyways. Some of the ECUs give out Injector Pulse Width(IPW) and dataloggers use a guesstimate calculation based on IPW, RPM, and dead time to try to give a duty cycle, but they are usually off. Like Evoscan is a good 15% off at high duty cycle. 115% duty cycle in Evoscan is more like real 100%. Systems like the AEM EMS give true duty cycle, but a box like that can do it because it is actually controlling the injectors.

The whole 80% duty cycle thing that books and injector makers recommend is BS. Even some OEMs run them well past 80% on stock cars.

As Josh said, with an airflow tricking system like an SAFC, you want as small of injectors as you can get away with. The more you have to deviate from 0% in the SAFC, the more unintended sideeffects start happening.
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