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Originally Posted by 370zrider
From what I've read here, when you install a turbo kit without BOOST CONTROLLER you can only have like 6psi but when you get one installed you may go like 10psi or further… is this right?
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No. Boost pressure is based on the wastegate spring you are running. You can have either internal or external wastegates. I'm going to ignore internal because I don't like them, and I'm running external. Your external wastegates are going to come with a bunch of different springs that you can mix and match to get you to the desired boost level. A boost controller allows you to run a set additional amount of boost on top of the wastegate level. As for how much additional you can run it varies depending on if you have a manual or electronic boost control. All the electronic boost controllers I know of limit you to adding 100% of wastegate pressure, so if you have a 6lb spring the max you can run with boost control would be 12lbs. I've never run a manual but I don't believe they have the same restriction.