the ECU knows the TPS reading and adjusts the ignition timing based on that. it contains a timing map that is RPM vs TPS -> Timing.
Oh, I see what you're saying! Sure, if you trick the ECU into thinking it's WOT, that will certainly advance the timing. However, now you're running rich. I guess you fix that the main Bazzaz module.
the ZBomb does not richen the FI map throughout the RPM range, and esp not for all throttle openings. my dyno tuner confirmed this way back.
No, not for all throttle openings. However, TPS info is independent of RPM.
So, Z-bomb could theoretically change it's series resistance as a function of throttle position, however, it's impossible to change it via RPM.
However, I don't have one. So, there's that.
im reasonably sure that the ZBomb is NOT a constant resistor. i have one in the garage so maybe ill have time to confirm later.
Naw, I'm guessing it's an active circuit with a voltage arbiter. Meaning once the Zbomb reads say 3 volts, it adds an addition DC offset like .2 volts to trick the ECU into thinking the throttle is open wider than actual.
Let us know what you find out though!