10-12-2011, 08:35 PM
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#18 (permalink)
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Base Member
Join Date: May 2009
Location: Chicago
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Quote:
Originally Posted by johnwigs
??? one main difference (besides the VVEL) between the VHR and a DE that would affect "throttle response" is plenum space... the VVEL system keeps the throttle body open and controls air with the VVEL actuator (once engine is warm and is in closed loop) and that will eliminate the "stored air" that is in a plenum... just some food for thought
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Theoretically the response should be greater/better with the VVEL actuating cylinder filling rather than the relatively distant throttle plates. Plenum is normally under vacuum until WOT, there would be a delay in the higher ambient pressure air making it to the valve relative to the plenum already being full with the TBs already open.
Maybe the VVEL actuator just doesn't move as quickly as a throttle plate? Comparatively, I'd imagine the VVEL mechanism has a lot more "stuff" to rotate, more mass, inertia, etc... (This is just a guess)
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