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Message: <blockquote data-quote="Maniac" data-source="post: 606846" data-attributes="member: 20491">sorry bro, but i beg to differ with your assessment that the 3750rpm curve deviations are due to the tuning box.  do note that the anomalies can be observed in all the stock curves.  you can see the same behaviour in my 320d, the 520d and wuk's 320d when dyno-ed on the stock setup.  in the heartbreaker dyno, the effect seems to be attenuated out more, which commensurates with the nature of the dyno measurement.however, you may be onto something with your point on regulation of the boost.  we can still observe the anomaly in the vector-ed curve, because the boost is not altered.  however, in the DTUK-ed runs, the power/torque deviation can hardly be seen at all in my 320d, but you can observe it somewhat in the 520d curves at the 3750rpm mark. this should equate to a much smoother power/torque delivery at these "high" diesel rpms for DTUK</blockquote>