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Message: [QUOTE="Blowby, post: 329579, member: 711"] In your case drive pressure. In an electronic controlled solenoid system when high pressure source air is used a lower spring force is best. You need to know what your offset psi from boost to drive pressure is. Make sure you add additional pressure to this value when selecting a spring force. Example: Boost 35psi peak / DP 45psi peak. Spring force will need to hold maybe 15psi. Don't just use the rate of the spring to determine the spring force. Apply a regulated pressure to the bottom and find out just how much it can hold and use the actual pressure you come up with. Example: Boost 35psi peak / DP 55psi peak. (with 25psi spring force) Change to a spring force of 15psi and it will bleed off before you ever make 35psi boost. Drive pressure offset will rise and fall based on the turbo design and wheels used and the [B][U]fueling in your tune[/U][/B]. You might have high DP mid range where we fuel well but as the fuel drops off at higher RPM's the DP will drop and your boost could increase to equal the DP if it's 1:1 at that point. Let us know how it works out for you. [/QUOTE]

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