Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Ignition Setup Tutorial - Manual (Page 31)

Static Test
Timing
Window
Dynamically Checking Rotor Phase
To check rotor phasing dynamically, the distributor cap will need
to be modified so that the position of the rotor tip to the cap
terminal can be observed when the engine is running. To do this,
a large hole must be made in a distributor cap, near a terminal that
can be easily observed. To help see the rotor tip, mark the top of
it with white correction fluid. Install the modified distributor cap.
Connect the timing light inductive lead on the plug wire going to
the terminal with the hole near it. Set the Static Testing Timing
value to the timing value you plan to run at peak power. Start the engine and run it at 3,000 RPM.
Make sure the “Dash” timing value reads the desired timing for maximum power. Shine the timing
light into the hole in the cap. The light from the timing light should show the rotor tip is in-phase with
the cap terminal at the timing value for peak power. Most timing lights have somewhere around a
degree of propagation delay so keep that in mind when looking at the tip.
Illustration shows rotor in-phase with cap terminal
B-A-L Cam Sync Diagnostic Feature
The B-A-L feature can be used to verify that the cam sync pulse is occurring before, and not at the
same time as the crank sync pulse. To activate this diagnostic feature, type the letters “B A L”
simultaneously while communicating with the GEN3 ECU. A small box will appear near the tool bar
in the upper right corner of the BigComm software screen.
With distributor based applications (ECU configured for a distributor), the engine rpm must exceed
2000 rpm before synchronization is attempted, so the synchronizer will remain red below 2000 rpm.
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