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Old 17-04-2019, 12:49 PM
sambeeb sambeeb is offline
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Default BMW M4 GTS WI

Does anybody know if the factory direct port system used on the M4 GTS is sequential on each cylinder or common across all?
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Old 24-05-2019, 06:59 AM
Richard L Richard L is offline
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Default Re: BMW M4 GTS WI

There are only three jets for 6 cylinders, not sure how it can be sequential.

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Old 02-09-2019, 06:43 PM
sambeeb sambeeb is offline
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Default Re: BMW M4 GTS WI

Hi Richard,

The water jets looked to me to be designed more like fuel injectors in that they have a solenoid on jet arrangement rather than 3 dumb jets with 1 common solenoid. I figured that if they were designed that way that they'd run semi-sequentially much like a fuel injector. I just thought (if my assumption was correct) that the water injectors could be controlled (based on the injector numbering in the diagram you posted) in a 1 3 2 3 1 2 spraying order to line up with the straight six's 1 5 3 6 2 4 firing orders' intake strokes. That would mean whenever you had a piston on its intake stroke its corresponding water jet would fire with a fuel injector but obviously at the required pulse width. Yes it would be a wasted shot on that jets adjacent cylinder in that pairing, but you'd cut your water consumption massively compared to blanket spraying across all 3 jets all the time when only 1 cylinder is on an intake stroke. I'm probably completely wrong but they looked like injectors to me and that seemed like the logical way to run it.
sam
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