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Message: [QUOTE="V-Ref, post: 53358, member: 660"] Hey...since I created the chaos here....I feel compelled to try and make it worse! :priest: This is all JMHO...without a turbo rpm gauge, and a boost/vacuum reference installed pre/post compressor...I don't know enough to say my opinion is worth anymore then what it cost me to post it. The thing commonly referred to as "surge", the "choo choo choo" sound the stock turbo makes when you push it beyonds it's happy place....is just a bunch of miniature versions of the big "bark" you hear after a high boost/high drive scenario, and you suddenly remove all the drive pressure by pulling your feet away from the floor. IMHO they are both "[URL="http://en.wikipedia.org/wiki/Compressor_stall"]compressor stall[/URL]", just a less aggravated condition/version of the same phenomenon. I strongly suspect, that by plotting the data points from a boost guage and a turbo rpm gauge, both the "choo choo choo" and the "bark" would plot to the left and north of the surge line, on that respective turbochargers compressor map. I'm gonna call that Jose fella @ Forced Inductions...see if he's got 2 minutes to answer that question.... Or maybe we can lure in a brave smart guy from PSA, to post up, and keep us all on track....I know there's somebody(s) reading this thread that knows the absolute answer... :poke: [/QUOTE]

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