06 gxp custom cai

[f3racer]

I understand the dynamics between 3 in tubing cfm and 4 inch. But what happens when you try to cram that 4 inches of volume into a 3 inch hole that will only allow 3 inches of volume? Still doesn't make sense to me but I'm no math wiz.

[SlowNA06]

I understand the dynamics between 3 in tubing cfm and 4 inch. But what happens when you try to cram that 4 inches of volume into a 3 inch hole that will only allow 3 inches of volume? Still doesn't make sense to me but I'm no math wiz.

Actually, the idea is to cram the entire world's worth of air into a 3" hole. This will flow better than anything else. Problem is, the world is dirty, so you need a tube with filter on the end as a "necessary evil." Anything on top of the throttlebody represents a restriction.

A 3" tube adds significant restriction on top of the 3" throttlebody. A 4" tube causes less restriction - negligibly close to running an open throttlebody.

The smaller the tube, the faster air must travel through it to create the same charge as a larger tube with slower flow. Air can only move so fast, and the filter slows it down even more. With increased need for air, eventually, on both a 3" and 4" tube, you will not be able to pull in enough air for proper combustion (such a point is rarely, if ever reached), but the 3" will see that point before the 4". Less vacuum can pull the same amount, or more air in a less-restricted setting - so it can be mixed with more fuel to create more power.

I'm short of creativity, so this is the best example I can some up with: Beer bong. The human esophagus is an inch in diameter. Now, while you can use a 1" diameter tube for your beer bong (and yes, this is cheap and easy to test amongst your friends!), you will be a vastly faster racer with a 1.5" or even 2" diameter tubing. In fact, it is fastest to use a glass, because it represents even less restriction.

[MoarkatsINmuhtrailer]

^^^^^ all of this lol