A question was posed to me about how the turbocharger boost onset data might look if the range being compared was expanded from 2 to 11 psi to go from 1 psi up to 20 psi.  The 20 psi top end results in the BW K03 data being lost on account of the boost profile that I used with the K03’s stopping short of 20 psi of boost.

For the remainder of the turbochargers the data that I have collected produces the following results with a 1-20 psi range.

The general trend is similar to before, although the FrankenTurbo F21 and TTE550 are now harder to distinguish differences between.  The differences between these two products now appear smaller than with the 2-11 chart, below.

Subjectively I feel that the 2-11 chart captures the differences in feel from the driver’s seat better, but in terms of practical differences the data on the 1-20 chart suggests that at least in one comparison the differences may be less than those I have perceived.