I don't think the stock turbo would be too effecient over 22 lb, if that is what you have. So depending on your turbo and chip, you can start at 44 lb static, line off fp and 15 lb boost to be a little safe. You MUST have some sort of scan tool to safely mess around with boost levels, IMO, to read your O2's for fueling and most importantly, the kr. It would not be a bad idea to have a fp guage on the end of your fuel rail to run up under the wiper, on occasion, to be sure the fp rises with boost.
Then it is really about octane and WOT fueling after that. With a 93 chip for example, the fueling in 3rd where the engine has the most load and more likely to cause kr, is not as rich as something like a high octane, higher timing, race chip. So the race chip lets you take more advantage of the higher octane fuel. Pump gas, 93 or 94, will only get you on average about 17 lb max boost. Add some high octane fuel and with the right tuning you can max out your stock turbo on 100 to 110 ocatane "leaded" fuel, which will also kill your $35 O2 sensor.
I have had good luck with a 100 Xylene mix that is not leaded and won't kill your O2 sensor. Just add the high octane, and increase the boost a lb at a time, testing in third gear, monitering knock retard. Just be sure your car is running good before you start increasing the boost.
