Quoting tintoy:
510cc, 2g maf, small 16g, 3" down pipe, rs fmic.
Any sort of logging capabilities? There are a TON of factors to consider when you talk boost levels and timing, all dependant on individual car setups, how healthy the engine/etc is, effective DA, octane rating, plug type, etc etc etc.
A general answer to your question can only be "as much as you can without damaging anything" because honestly, it varies a fair amount from car to car.
More details! As much as possible!!
-Jake