Download video: Toyota 4AGE Engine: How to set Ignition Timing (AE86)
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Specs for the 4A-GE 16V Blue Top: 10º on diagnostics mode, 16º on normal mode.
Specs for the 4A-GE 1st Gen aka Blue Top (16 Valve): 10º on diagnostics mode, 16º on normal mode.
Specs for the 5th Gen 4A-GE aka Black Top (20 Valve) : You must short the TE1 and E1 Pins on the Diag Connector and the degrees are (from the BT repair manual):
8-12º @ idle (In diagnostics mode-with wire short)
10º or more @ idle (in regular mode-without wire short)
If you don't have a diagnostics port, you can try to splice the ecu wiring and install a switch to short the same two pins (E1 and T) on the ecu ifself. Pinout schematic here: