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The insights and I believe HCH the switch over point is 2500 rpms. Thats assuming the car is warmed up and its not floored. Otherwise it will engage it at lower rpms. I think for the SI its much higher like 4800-5700 rpms.
It seemed you got a testing method, so I didnt think it would be any trouble to test that as its something I wondered if using the lower end of vtec or the upper end of the stock grind gave better mpg. You know cam profile 1 vs 2.
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