| Fueling issues are VERY common with these cars and most people dont find out about it until it is too late and they burn down a piston or valve. Since these cars are getting older and older each day, the potential for having a fueling problem grows with time and mileage. Because of this, I would suggest that anyone who goes above the stock turbochargers should at least install a fuel pressure gauge in the car so they can monitor it. When pumps begin to fail, they get weak and dont maintain proper fuel pressure all the way to redline. The car will actually perform better as well since leaner conditions will produce more power, which will make someone even less likely to believe there is a problem until something goes BOOM! So, the answer there is mostly guided by the fact of age and wear. However, on a properly maintained Z that has a strong pump and all the fueling system is operating normally, you dont really start topping out on it until you get around 650RWHP or so. More power has been made, but the workload on the pump becomes increasingly harder and will cause it to wear out quicker. Upgrading the fueling system for cars above the 600RWHP level is highly recommended as you will start with fresh components and be spreading the wear out across 2 pumps, which inevitably will give you a longer reliable service life from the components. This is just my suggestion though and it is a good bit on the conservative side given the fact that I have just seen far more cars with fueling issues than I have seen without.
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