Ed,

Thanks for the information you found.

I considered constructing the circuit that I use to extend the pulse width in such a way as to reduce the current during that extended pulse time.  That would approach peak and hold operation to some extent.  I decided not to do this in the interest of making incremental changes instead of several at once.  An added resistor for each channel would do this, but the short time that the current would be reduced at the end of the pulse isn’t really what one would want.  Each channel is individually adjustable in terms of the added pulse width, though.

In the interest of putting my money where my mouth is (or where socks may soon be) I have used the information Bill provided and have a set of blue and red RX8 injectors on the way.  Assuming that they check out and that I can install them without too much trouble on my engine stand, we’ll find out if the tuning works as I hope.  The proof is not in the saying but in the doing.

Looking forward to giving a tuning demonstration at the next Rotary Roundup or some unique cuisine.

Steve