turbo/supercharging

[Todd King]

  <<<
  of the air (i.e. throttle position), how does that work with turbo/ super 
  charging??  is the plenum always pressurized, or
  is there still the vacuum at low rpm's ???
  [ from one who's only thought about SC and TC ]
  Tom Cloud <cloud at peaches.ph.utexas.edu>
  >>>
  
  Allright! Another guy about to realize the incredible benefits of forced 
  induction and join the Dark Side! May the force(d induction) be with you! 
  Think intercooled turbo; there are few drawbacks and it's truly (mucho!) power 
  on demand, then it's out of the way when you don't need it ie regular old 
  "vacuum" just like n.a. induction while putting around town, then the sky's 
  the limit (well, depending on octane and a few other things :-) for power when 
  you need it. The turbo offers the highest specific output potential of the 
  two; it's more efficient (and more flexible) than a mechanically driven 
  supercharger since it uses otherwise wasted exhaust gas energy. There are a 
  ton of old, misleading misconceptions about 'em, but take it from someone 
  who's been running turbos for nearly a decade now: once you get one, there's 
  no going back to n.a. when you want power! BTW there is always pressure (on an 
  absolute scale) in the intake manifold of every engine. We should toss the 
  notion of vacuum and just run absolute pressure gauges to ease some of the 
  confusion :-)
  
  Todd_King at ccm.co.intel.com