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Jsveb, thank you for the reasoned and thoughtful response. Yes the spring will release pressure at the same amount every time. but under different atmospheric conditions that pressure is built at different RPM,s there fore changing the power band.
For Street driving or people who have 'point and shoot' driven style this is not an issue.
But for people who drive closer to the edge, carry more speed in turns, when the power comes on is very important especially in a rear engine car.
Porsche had these boost knobs installed on factory built race cars, they were not installed to give more power at a dramatic moment in the race because every moment is dramatic and the engine should be at maximum safe power through out the race.
No, I believe they were installed for driveability, to adjust boost to meet the changes in weather conditions, to maintain a predictable power deliver.
In so many words that has been my question.
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