Knock sensor Frequency changed from V2 to V3 FW

In the past, on EMU Classic and Black with V2 FW we calculated knock frequency 1800/(Pi x D)

In the V3 FW there is a different formula. Now it is 900/(Pi x D)

Can somebody explan me, why?

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All in all it’s the same equation. V2 has diameter of bore in calcs, whereas v3 is radius of bore (which is half of diameter), hence why 900 is listed instead of 1800.

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As jpbello07 wrote. It is the same.

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