Posted by Indiana Ken on October 09, 2011 at 17:23:55 from (67.177.114.180):
In Reply to: Turbo- How posted by Pat-CT on October 09, 2011 at 16:56:49:
To simply "rev up" an engine without load requires very little throttle opening (gasoline engine) or in the case of a diesel very little increase in fuel flow over idle conditions. The turbocharger exhaust turbine is driven by hot exhaust gases and simply reving an engine without load does not significantly increase the temperature or volume of the exhaust gas stream.
Conversely placing an engine under load requires greatly increased fuel flow to maintain engine RPM. This increased fuel flow increases the exhaust gas temperature and volume causing the turbo to spool up.
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