I talked to one of the engineer's that did quite a bit of the sparkplug and fuel testing on this system at Delphi. It will work equally as good with any sparkplug or gasoline. He said the only thing it didn't like was a fuel additive made by Gunk.
From my own personnel experience and from what I've read in technical white papers about the Delphi Ion Knock Sensing it does matter what spark plugs you use. While tuning my motor in the timing section of the map with NGK's which have a 3K resistance I could hear that the motor was knocking under load but the play back of the recording I took showed no signs of knock. I left the settings in the map the same and used the HD plugs which have a 22K resistance and took the bike out for another recording session. There was no knocking under load but there was a definite flat spot at certain RPM's. When I checked the recording right at those flat spots it showed the knock detection had kicked in and retarded the timing as I had pushed the timing too far advanced at those Rpm settings. The Delphi Ion Knock Sensing is specifically calibrated to work with the resistance of the HD plugs.I talked to one of the engineer's that did quite a bit of the sparkplug and fuel testing on this system at Delphi. It will work equally as good with any sparkplug or gasoline. He said the only thing it didn't like was a fuel additive made by Gunk.