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The 87 turbo z was 6.7 stock, but when they get older they could lose boost do to age. It could also be your stock boost gage not reading the correct boost. You should buy a after market boost gage and a boost controler, with a high performance exhaust, intake from K&N and a boost controler you should get huge horsepower gains. Just make sure you dont go over 11 psi without an intercooler and run high octane gas.

If you want to go over 8 psi, you will have to remove the stock pop off valve.

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Q: Why is your 1987 Nissan 300zx only boosting 3 psi instead of 7 psi?
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