Quote:
Originally Posted by Diseasel300
The 60x VCV isn't progressive in the sense of supplying a varying vacuum signal. It is "on" until the throttle reaches a certain position, then a rubber seal is pressed against the vacuum orifice by a spring. At WOT, the spring is fully collapsed and forced against the orifice for a positive "off". There are several writeups, including on this forum, of how the VCV works and how the vacuum signal is generated. On the turbo engines, the BUFO is there to create a vacuum signal based on engine load, not throttle position.
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The 60X VCV is absolutely PROGRESSIVE, and serves as a throttle position signal. The combination of throttle position and manifold pressure is used as a surrogate measurement for load. Think about it this way: your description...'on' until a rubber seal is forced against the orifice...could just as easily apply to a kitchen faucet. The flow rate is determined by the volume of the gap between the orifice and the rubber seal. See the video:
http://www.coolcatcorp.com/Mercedes/IMG_4414.MOV