TwinTurbo.NET: Nissan 300ZX forum - two main differences....
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Subject two main differences....
     
Posted by Madhatter10-6 on July 02, 2010 at 7:15 PM
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In Reply To Blitz Spec R vs Spec S-- Differences? posted by ZXoltan on July 02, 2010 at 05:17 PM
     
Message 1) Dual solenoids can handle more boost. Single = ~ 18 PSI and Dual = ~ 36 PSI

2) Electronic boost controllers typically use either a stepper motor or a solenoid. Steppers can vary how far open they are open while solenoids are either fully open or fully closed. Solenoids can open and close extremely fast and by doing so they allow air to bleed off and control boost. A dual solenoid is literally one control unit with two solenoids in it. This allows it to be more responsive to boost changes and maintain a more consistent pressure.

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