When the intake valve closes, or when the throttle valve snaps closed, a negative pressure wave travels back through the intake duct to the air box. At this point, the negative pressure wave reverts back to a positive wave. The Helmholtz resonator functions by timing this flow reversal such that the positive wave arrives back at the intake port just as the intake valve again opens.

This enables more charge to enter the cylinder and increases the volumetric efficiency of the engine over what would be possible without the resonator. This in turn leads to a greater torque output than would otherwise be possible. The action of the Helmholtz resonator is most pronounced in the low to mid rpm range.

Reference: http://www.grapeaperacing.com/GrapeA...ehelmholtz.cfm

02 DX Millenium Red

 

so the best bet would be........? keep the stock air box and drop in a K&N panel? how noticable is the torque loss with a CAI?

 

sidpro5,

You might want to check these out:

http://www.clubprotege.com/forum/sho...&threadid=1977

http://www.clubprotege.com/forum/sho...&threadid=2370

02 DX Millenium Red

 

I wonder if by adding the Tornado, you've effectively reduced the air flow, therefore now the CAI performs like the stock intake system???

 

No way. There is not enough there to restrict airflow.