ZBuzzard

I have a ‘72 240Z w/2.8L engine with a high compression head(10.5:1), triple Weber’s(40 side drafts), and a 123Ignition dizzy. I’m pretty sure I have the carbs dialed in, it gets a bit lean. between. 2500-3000, so I think I’m going to go up one size in the mains, but that’s the least of my problems. I get spark knock at low RPM’s under load. I have tried a dozen or so different ignition curves and no matter how low my total advance is, spark knock. I’m a newb when it comes this programmable dizzy. In addition to the ignition curve, I can edit the MAP curve as well. Trying to figure out how to get this thing to retard the timing when I put my foot in it at low rpm’s. Is that possible by using a specific MAP curve, or is that unrelated. Replaced 1 head gasket already, pistons checked out ok, but don t want to risk damaging them. Any advice would be appreciated. Oh yeah, anyone have a few good ignition curves for a 2.8L engine(N47 block, E88 head, Schneider 275 cam, triple Weber’s). Cheers!