Originally Posted by Terry@BMS
Right, I assumed this was the case. But you think its possible, then, to have the JB4 doing nothing but boost? I.e. fuel and timing are controlled completely by the DME and the JB4 isn't biasing any inputs besides the MAP sensor as we discussed (clamping MAP value at the DME's expected boost level)?
Related question: what happens when the JB4 clamps the MAP signal at some value lower than the actual value? Doesn't the DME put in less fuel than would be required? So the JB4 would bias the o2 sensors in that case to gain some extra enrichment to meet target AFR's etc? This is what I want to avoid; I want the DME seeing the unmolested signal in all cases. Any thoughts on this would be appreciated. "