Custom CAI

[hsanders]

I purchased the parts from Pep Boys. Cost was around $80 not including the filter. I hav noticed an increase in throttle response and the sound is just awesome. Let me know what u think.

[hsanders]

closeup

[hsanders]

another angle

[GT2000]

Looks nice, mine is similar. Also got all the parts from pep-boys =P. Only difference I see is I also removed the "ribbed for her pleasure tube". I have aluminum all the way to the TB.

[3 DeeJay]

looks good.

[xLongIslandcore]

Does the ribbed tubing drastically effect air flow to the TB?

[roksoc]

could you post the parts and maybe a how-to I would really liek to make one of these it looks really good.

[RocketMan]

For any particular mass flux of air, skin friction will determine the velocity needed to induce turbulant flow. Skin friction is a function of material properties and roughness. Ribs can be thought of as roughness since the definition of roughness refers to the height of the hills and valleys on the surface. From all this you can tell that the velocity needed for turbulant flow will be small. For polished aluminum the skin friction is substantially less so at lower throttle laminar flow can be maintained.

Laminar flow has a parabaloid velocity profile within a pipe where the highest velocity air is in the very center. This can in theory help induction when the throttle plate is open. However when it comes to tight turns and stuff like you might get in a header (I dunno what kind of effect the geometry of a header has on the air flow), turbulant air is actually better for drag because an orderly laminar flow going around a corner at a critical angle will cause boundary layer separation which creates a lot of drag whereas turbulant air flows around corners much more easily.

[roksoc]

Originally posted by RocketMan
For any particular mass flux of air, skin friction will determine the velocity needed to induce turbulant flow. Skin friction is a function of material properties and roughness. Ribs can be thought of as roughness since the definition of roughness refers to the height of the hills and valleys on the surface. From all this you can tell that the velocity needed for turbulant flow will be small. For polished aluminum the skin friction is substantially less so at lower throttle laminar flow can be maintained.

Laminar flow has a parabaloid velocity profile within a pipe where the highest velocity air is in the very center. This can in theory help induction when the throttle plate is open. However when it comes to tight turns and stuff like you might get in a header (I dunno what kind of effect the geometry of a header has on the air flow), turbulant air is actually better for drag because an orderly laminar flow going around a corner at a critical angle will cause boundary layer separation which creates a lot of drag whereas turbulant air flows around corners much more easily.

English please :lol:

[xLongIslandcore]

Originally posted by roksoc
English please :lol:


lol....

i think the answer is yes because the smoother the air travel to the TB, the less restriction of air flow there is. No ribbed tubing=more efficiency for the intake itself.

[roksoc]

Sorry. Double post.

[roksoc]

Originally posted by xLongIslandcore
lol....

i think the answer is yes because the smoother the air travel to the TB, the less restriction of air flow there is. No ribbed tubing=more efficiency for the intake itself.


Thanks. Looks like a sweet set-up. Post ass dyno results.

[hsanders]

I might be going to the dyno next week. If I do I will do 4 pulls, 2 with the stock air box and 2 with the CAI. I'll post results.

[ChevelleSSLS6]

Originally posted by GT2000
"ribbed for her pleasure tube".

did you get that from me? lol thats ok

but seriously, theres a cai group buy going on right now, it's easier than figuring out what you want/don't want and need/don't need for a CAI.

[xLongIslandcore]

a cai for 3.4's dont exactly help ME out, so bassically im stuck with the induction dynamics product, which is what...300+ dollars...cool!!!

[Needles]

Can you play 'er????
Seriously, looks real nice...and now I'm seriously thinking...better than stock Ram, is it? Your answer is going to trigger me leaving right now, or going to take a p***...

[03gagt]

maybe off topic maybe not....can someone post the numbers for the length of eash piece of tubing in the CAI I am thinking of attempting this again but my numbers were horribly off on the distnace for the holes for the tunes...also how far away they can be maximally....sorry if this is off topic

[hsanders]

Yes, the CAI is better than stock Ram Air.

[RocketMan]

Sorry, can't help going O.T. but ChevelleSSLS6 what would one have to do to get one's face in them funbags..... :) I could spend days rollin around in there.

[MantaGreen97]

Originally posted by RocketMan
Laminar flow has a parabaloid velocity profile within a pipe where the highest velocity air is in the very center. This can in theory help induction when the throttle plate is open. However when it comes to tight turns and stuff like you might get in a header (I dunno what kind of effect the geometry of a header has on the air flow), turbulant air is actually better for drag because an orderly laminar flow going around a corner at a critical angle will cause boundary layer separation which creates a lot of drag whereas turbulant air flows around corners much more easily.

Ahh a lesson in fluid dynamics for us all :P :D

[urweak]

Originally posted by RocketMan
For any particular mass flux of air, skin friction will determine the velocity needed to induce turbulant flow. Skin friction is a function of material properties and roughness. Ribs can be thought of as roughness since the definition of roughness refers to the height of the hills and valleys on the surface. From all this you can tell that the velocity needed for turbulant flow will be small. For polished aluminum the skin friction is substantially less so at lower throttle laminar flow can be maintained.

Laminar flow has a parabaloid velocity profile within a pipe where the highest velocity air is in the very center. This can in theory help induction when the throttle plate is open. However when it comes to tight turns and stuff like you might get in a header (I dunno what kind of effect the geometry of a header has on the air flow), turbulant air is actually better for drag because an orderly laminar flow going around a corner at a critical angle will cause boundary layer separation which creates a lot of drag whereas turbulant air flows around corners much more easily.

So your saying that sharp turns should have something before them to make the air turbulant to help the air move around those sharp turns easlier?

[RocketMan]

Well lets not use "should" cuz i'm no authority on induction design. I can tell you though that for rockets, "turbulators" are purposely built on the surface of a rocket, usually after the nose, because after the nose, the laminar niceness has done all it can do (reduce pressure drag due to incident surface area) and at that point all its got left is to pass by the jagged fins and recombine into a uniform flow rather abruptly at the tail. This is where a turbulant flow can reduce induced vorticity at the tail and around the fins, though some well designed fins can work in laminar flows

....anyway if you think about rockets, then flow in a pipe can be viewed kinda in the same way i guess. Not like that ribbed pipe is there for aerodynamic reasons....it is pretty crap all around in that regard, but if you have severely changing diameters/geometry or sharp turns that cause boundary separation those points would be where turbulant flow can help....but its a case by case consideration...you really have to model it with something like ANSYS to tell if its worth it. For simple CAI's the geometry is straightforward already so laminar is best for what pipe you have control over cuz it'll screw up anyway when it gets to the manifold.

[skateswitch97]

unralted but ou mentioned it so im curiour, how much is the dyno run going to cost you?

[skateswitch97]

wow i ahve to pay attention to my typing, i am curious how much your dyno run is going to cost you, im kinda looking to get one done