Re: Schrappnel Knob

[glen.powell@smc.com]

  Running higher octane fuel will not in and of itself
  result in higher boost pressures, it merely *permits*
  higher boost pressures without knock. You must
  alter the behaviour of the WG and/or have a boost
  control system (CPU) that will increase boost pressure
  as a function of fuel quality in addition to controlling
  ignition timing. Later 5000 turbos can increase the
  boost presure this way (actually, I think decrease boost
  if knock is detected), but only within very strict limits
  designed into the boost control mechanism. You still
  will need a stiffer WG spring and/or something like
  the pressure regulator discussed here to add to
  the resistance of the spring and achieve substantial
  increases in boost pressures.

  -glen