Yesterday I installed the VFC-III and the IAV, plus I also put on the new Hi-flow air filter that Lloyds is selling for the XC. I already had the stage 1 exhaust and mapping. As a starting point I installed thje VFC without making any adjustments and I put on the IAV set at 4 turns out as the instructions recommended. I then went for a test ride and I just cannot tell you how happy I was with the results!
Almost allof the popping and backfiring is gone, but on top of that I can tellyouthe throttle response isway better. I now have to be carefulnot to over rev it becausethe revs increase so quickly.I still have a few popsor small backfires from time to time, but it is soooo much better then before, I just love it. Mostof the popping now seems to be when I am doing weird things with the throttle, like chopping it quickly, etc.
One thing I did notice this morning is that the cold starting was a lot harder, but I was ableto adjust the IAV and that seems to have helped. I won't know for sure until a coupleof more early morning cold starts.
The main thing fornow that has impressed me is that I installed the VFC-III with the stock setting and haven't made any adjustments and so far I am very happy!