timing adjustment obsessed Options

[eldrewado]

hey everyone. ive got a 99 5sfe celica. as many of you know this means i have a non adjustable distributer. ive been told the computer adjusts the timing.
so my questions are: how does the computer adjust the timing? what sensors does it use to read the timing? does anyone know how the sensor or ecu does what it does in the area of timing? my goal is to "trick" the computer into advancing my timing a bit for better highway mileage and maybe some more power. surely there has to be a way to do it. ive heard i could do it with the timing belt, but then i heard i couldnt. any input greatly appreciated. thanks

[delusionz]

can you fit a distributor from an older model?

it should work exactly the same, you should have 10deg of base advance at idle (at operating temp) and the computer keeps adding advance according to its maps until knock is detected, then it will back off, if knock happens alot, it will start to remember until the next time you reset the ecu. unfortunately the only thing you can do is make sure you're running the correct octane fuel, and reset your ecu