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or they dont. Id be more concerned with the age of the fuel pump. Plenty of people run 15 psi on stock injectors on 93 octane with no problem. As far as adequate fuel delivery, the stock injectors can handle 15 psi, however the margin of safety is decreased only because your turning the boost up. It all depends on your comfort zone. If i had stock turbos, i personally wouldnt run more than 12-13psi on stock injectors unless it was below 65-70 degrees. Im running Sport 500's at 12 psi on stock injectors, and ive got no fear even in the heat of the summer since im only pushing 12 psi, but im still getting the same power as 15 psi on the stock turbo. Theres more to the equation than just fuel delivery. Intake temps and timing play a large roll as well.
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