make sure you turn the distributor towards the firewall too, or clockwise. heres how i did my totally free timing advance:
went to walmart and bought a timing light for 40 bucks
drove down the street to a local self serve car wash with the tunnels (it was raining out)
loosened distributor, and marked its position at stock. your going to need a 12mm wrench, and a small one at that, the back bolt is a bitch to get to, and adjustable wrenches just wont fit, it pissed me off repeatedly.
unplug the TPS sensor, and then start the car. it will rev up, and imediately drop down under 1k, almost stalls. you need to rev it over 3k 3 times, to lock it into timing mode. then go hook up your light, if you havent already, put the inductive pickup on the plug to the far left of the engine bay (towards passenger side)
it will start to blink if done right, remember the inductive pickup is like a ring type of thing, it doesnt clip onto the wire, it clips around it, i was all confused the first time i did it, cause i was clipping it on it, and it wasnt working.
now shine the light on the pulleys on the passenger side of the engine, the one you want is like all the way in the bottom, you will see the marks on it when you get the light on it, you will also notice a little pointer thing that tells you which mark your timing is at. now if its just you, you want to go back and forth, move the distributor alittle, then check timing, move it allittle more, etc etc, til your at 15*. make sure you are turning the distributor towards the firewall, or clockwise, the first time i did mine i turned it the other way, and it retarded my timing, making me slower. (for the GA16 turn the distributor clockwise, for the SR20 its counterclockwise)
when you're all done, shut off the car, tighten the distributor bolts down, making sure not to move it, and plug the TPS sensor back in. then start it up and enjoy the extra power!
this writeup made possible by the nice people at BS Performance