Did u preset the idle speed screw (primary butterfly ) adjustment to 1 1/2 turns before adjusting the sec butterfly stops?
I'm comfortable tuning at the track for WOT with ear and plug reading, but an AF meter would sure be nice for around town cruising, I will probably invest in one eventually. You just have to know around town and WOT are going to be two different tunes probably.
The readings are in milli seconds so one knows what is happening at any given time, rpms during a track run when played back.. one picks up the smallest of millisec anomalies so easy that any plug reading seat of the pants stuff there is no way one can over the whole run... one can then fine tune these anomalies/ transitions between circuits so accurately... even something like a single partial misfire in a run will show up as a AFR rich spike
There is no way that sort of thing can be picked up any other way.
Track and road cruising can be the same
idle timing and mixtures are same for both
Cruise mixtures and timing are for just that
WoT mixtures and timing are for track and same for street.
Basically think of having 3 dizzies and 3 carbs all built into the same 'box'
Does you meter use two O2 sensors in the collector?
one can run 1 or 2 (each side) also add other sensors like TP, IMAP, rpms, knock, crank position.
Basically what one is doing is monitoring the engine on a millisec scale then manually making adjustments to the 'anolog' timing carb etc
The only difference between this and modern ECU controlled engines is the ECU monitors and then can make real time adjustments to the electronic 'dizzy/ carb'
this is the 21 st century workshop tools on 20th century technology.. reading plugs that can only accurately tell u what happens at the end of the run during run off and rest is sort of guess work have gone....
Even on a daily driver it will pick up a plug that is just starting to break down way before. months before one can notice or even read anything.