I'm ready to have my bike dyno tuned. I have the PCIII USB. Should I keep the factory plugs in the bike for tuning or go ahead and switch to the NGK Iridiums then tune? I've read that I should wait until after tuning to change plugs. Any feedback on this?

 

Do you really thinkspark plugs are going to make a big difference.....I don't see it, but if your going to run the fancy plugs I would certainly tune with them in.

 

I think you may be referring to a comment I made on the forum. That was based on my tuning with a SERT and using live data runs to improve a canned map to my specs. Part of what I use is the 'knock retard' activity part of the data I record. This comes from ion sensing (this is where I get lost) which works as I understand it in conjunction with the spark plug resistance. I make the reasonable assumption that this is set for a standed OEM HD plug, so that is what I use when doing data runs.

As far as dyno work with a PCIII, I doubt it makes any difference but I would seek advice from the dyno tech.

Hope that helps and sorry for any confusion I may have caused.