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I have a tb48 turbo charged engine which is 6 cyl but has 12 injectors, i am using a motec m600 to tune it.
My questions is does it needs a special file to run on and how do i get this file if needed and does it need to be tuned by a special way or i just tune it normally like 6 injec engines?
With the M600 you only have 6 injector drives on the ECU so strictly speaking sequential staged injection isn't possible in your application.
Depending on the injector size and type, you may be able to pair the injectors and run two injectors per cylinder off each injector drive. This will have all the primary and secondary injector operating together though and this may prove difficult to achieve a satisfactory idle air fuel ratio.