(2)450 DP's vs (2)750 DP's

Ok latest tune and results. I went from .070 to .067 IAB’s, and from .035 to .033 MAB’s. Runs really well. It still sounds like a miss or light exhaust pop at the end of the transition slots, 40-55 mph. Checked the timing curve and I don’t think it’s a timing issue. Thinking it’s not liking the leaner conditions in that range. Will likely increase the IFR’s to give myself more fuel to work with in the transition area. Will probably increase the secondary jets a number or two also. Attached is a photo of my notes. Curious to the FABO tuning guru’s thoughts and comments.

View attachment 1716300895


I think you are about 7 thou too big on the MAB.

That gets on the booster quicker and it changes your PV timing and T slot sizing.

And of course main jet sizing.