how many washers should i be using in my Turbo XS dv???????
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On a Turbo XS I have no Idea. There is an optimum spring pressure for each DV to hold boost and bleed boost smoothly and accurately. It just so happens that a 5mm shim seems to work well on the 006. The 007P people report it's a great improvement, but that is likely because the spring rate pre-load is a little greater and hence closer to what the washer mod does to the 006. On the TurboXS, you'll need a boost gauge to see what's happening, then go from there..
Steve
Steve