Dual sync distributor

[Bobby Fazio]

Originally Posted by buzzinhalfdozen

Bobby, I've never used one of the dual sync set ups....what type of trigger is being used? Are both sensors the same (Hall effect,or VR type) ? Also your EFI controller does it have datalogging? If so does it indicate unusual engine speeds when the issue arises or a big change in injector pulse width? Or do you have other datalogging (racepak Ect.) that may show an unsteady RPM? I would think that if the crank trigger portion of the unit were acting up it would show up on a datalogger as a drop or spike in engine RPM. Joe

Joe,

They are both hall effect sensors in the distributor. Yes the DFI box has datalogging and the RPM curve looks kind of choppy throughout the entire run but I don't know the resolution of the curve. Car sounds strong though up until the mph cones when this miss starts happening. However, yes you see it on the graph, the injector pulse width starts fluctuating at the end, the MAP sensor reads more (or less). In Charlotte it was 97.9kpa the whole run until the traps and it jumps to about 101-102kpa. It is usually 103 on the two step. o2 sensor reads rich at the end as well. I have tried leaning it out/fattening it up but doesn't change anything.

Looking into possible valve float but I have good springs on there because I told Manley I wanted something good up to 7300rpm since I had no clue what I would go through the traps at when I was putting it together. This is only 6500 rpm though..