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audi v6 intake manifold design?

  #1  
Old 05-13-2008, 10:03 PM
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Join Date: Mar 2008
Posts: 22
Default audi v6 intake manifold design?

I've been looking into doing some porting and polishing on my 2.8 v6's intake manifold. When I started looking around for info on the manifold, I found pictures of the upper intake seperated from the lower intake. When I looked at the upper intake manifold from the bottom, i was surprised to find 6 more throttle butterflies, one for each runner. They are hooked up to an additional actuator net to the throttle body. What is the purpose of the butterflies? Are the cruise control or something? Can they be removed for better performance?

Thnx
 
  #2  
Old 01-22-2013, 08:14 PM
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Join Date: Jan 2013
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I believe it's called intake manifold runner control. The valves close/ shorten the runner length under hard acceleration for more power.
 
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