A stock turbo has been push to 18 to 19psi by some here on the forum. Where A stock injector has been push at 17 maybe 18 psi, but the life of a 370cc injector last that long is unknow. But you start to run out of fuel and run lean, because they can not keep up with 19 to 20 psi that a stock turbo will max out at. But a stock turbo will not last long at that pressure either for very long. But in the short run. As you can see by most profiles. Stg Ver's threw VIII mostly all run their Z's @ 15psi. To be on the safe side. Where if after market injectors where put in they could raise the psi more to reach the stock turbo levels of 18psi. Plus if you plan to go further with the car, you'll need after market injectors anyway. Plus you can get either new injectors from Nismo or rebuilt by RC, either way they are newer than the old ones in your car.
