Quote:
Originally Posted by xj_man_646
Its possible I missed it, what is the vacuum line on the turbo for? VGT?
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yup, the factory turbo is variable geometry. VW calls it VNT, this is a VNT-15, just a little tiny thing.
full vacuum is full boost, fastest spool-up ... but not as efficient at low throttle cruise. i have a pair of boost control valves to set one for max boost, and one for max boost low throttle. the low throttle switch is just a pneumatic limit switch on the throttle linkage that bypasses that control valve. see post #62