Guys,
still following this thread-even if I'm a Mikuni guy-
I have contacted mr. Franck and he responded. I have never been able to get into Sidedraft Central Yahoo group-which was mandatory if I was going to be part of this experiment. I have resorted to getting a Yahoo e-mail account to see if that helps.
keith wrote me saying that I might benefit from the tubes if my car did not pass the F.I. test-you guys might have touched on this in this thread. I'd say I am border line in that aspect. I have been reading the last few posts and it sounds like I am where you are as far as a slight hesistation during hard tip-in at lower rpms. No coughing, sputtering, spitting-just a millisecond of hesistaion, so maybe i'm at a pretty good point. At higher RPMS, above 3500, there is no hesitation.
I have tried quite a few things, but don't know if I have ever completely gotten rid of that slight studder. Other than that, these carbs have really been wonderful. I am going to put some fresh needle&seats in the floats so I know everything is good, and i am going to take to the dyno!
This weekend I even played with valve timing to see if that would change anything concerning hard tip-in at lower rpms-it didn't. I did quite a swing on the cam timing and basically put it back where it was-slightly advanced.
I have noticed watching my AFR's that WOT AFR is dictated by when hard tip-in occurs. If I stomp it at 2500rpm the AFR's look super rich for a while thru the rpms before getting to the 13 range. If I start out at a higher rpm the AFR's look much more optimum thru the remaing rpm range.