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Message: [QUOTE="CurtisF, post: 1062195, member: 829"] Yes. In the simplest of terms, Start of Injection (SOI) is when the injector opens up and sprays fuel. Now there is a lag time between when the event is "initiated" and when it actually does spray the fuel. That is accounted for in the tuning. There is also another lag time between when the fuel is sprayed and when combustion actually takes place. That varies based on different parameters. For instance, higher injection pressure causes greater atomization of the fuel, and it ignites quicker than fuel injected at lower pressures. It's a fun game. :fustrate: [/QUOTE]

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