Weapon-R secret weapon Intake.A+++
Joined: Sep 2005
Posts: 9,257
Likes: 136
From: San Diego/Redondo Beach

Originally Posted by jersey-G
Would any of you think that it's probably best just to do the intake and plenum spacer mods at the same time?
-GP-
I just figured it would be logical to do this cuz you have to take off the CAI, or WAI as some people are claiming, to take off the plenum anyway. I guess it would save from doing the install twice. Oh and I checked and if I'm looking in the right spot I believe I have a Black MAF plug. Now if only I can get someone at Weapon-R to write me back I can give them my money!
Is the rest of the tract 3.5" or does this 3.5" version feature couplers that neck it down? Why would an intake pipe that's larger than the oem maf/tb work better? What purpose of the "inner" chamber that I saw in some pics?
Joined: Sep 2005
Posts: 9,257
Likes: 136
From: San Diego/Redondo Beach

the inner chamber flows air through at a different rate than the outer tube so when they meet they create a velocity stack that forces more air into the plenum.
-GP-
-GP-
The whole intake is really a series of velocity stacks. The external end of the conical filter is stack #1, then inside the base of the filter is stack #2, then the pipe itself is a type of velocity stack, but really more of a venturi effect.
What I find the main advantage to be is that the pipe within a pipe design keeps the intake charge velocity higher at low RPM for better throttle response and low-mid torque. Then the larger 3.5" pipe allows for greater overall flow capacity for high RPM power. Kind of the best of both worlds.
Some engine designers use this technique as a variable tune intake manifold. When combined with variable cam timing, it can really flatten the torque curve.
What I find the main advantage to be is that the pipe within a pipe design keeps the intake charge velocity higher at low RPM for better throttle response and low-mid torque. Then the larger 3.5" pipe allows for greater overall flow capacity for high RPM power. Kind of the best of both worlds.
Some engine designers use this technique as a variable tune intake manifold. When combined with variable cam timing, it can really flatten the torque curve.


