Quote:
Originally Posted by mrg666
Okay, this is interesting. I have replaced the softest red spring of the diverter valve with the stiffer blue spring. That improved the low rpm power. Explanation, I think, is simple. The stiffer spring is recirculating less air and sending more boost to intake which increases the power at lower rpm. I will try the even stiffer yellow spring and report here. I thought this was interesting to share.
Edit: I tested the stiffest yellow spring. There is less but still noticeable power gain at lower rpm over the blue spring. And, when I release the throttle suddenly during acceleration, I hear less amount of re-circulation sound. I will keep the yellow spring although it was marked for highest boost applications. Please let me know if you see any harm for engine doing so.
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Not releasing boost when you have vacuum means you're getting compressor surge, and can damage the supercharger.