Should i remove the curved vains in the elbow

[CEngel]

I just removed my silencer ring and straight vanes in "can" should i also remove the crurved vanes in the elbow

 

[Heavyweight]

No... It will not help performance, so leave it there.

 

[Cattletrkr]

I removed mine way back when I was young and foolish, like 2 years ago. Don't bother. It actually makes sense that they're there. Knock out the baffles in the plastic thingy if you want to, but I don't think you'll gain much there either.

 

[WUnderwood]

you might hear more whistle, but thats about it

 

[Bob4x4]

The vanes in the intake tube add nearly 100 cfm at 1. 5" of water if I remember the #s correctly from the flow test I saw. Cummins does not add to the cost of mfg lightly.



Bob

 

[TFarrell]

The vanes in the intake tube add nearly 100 cfm at 1. 5" of water if I remember the #s correctly from the flow test I saw. Cummins does not add to the cost of mfg lightly.



Bob

i dont work for dodge or cummins so im no expert, but i would think that the entire airfilter/intake system is built and designed by dodge. and i think that they put it there to quiet down the turbo whistle for those customers who dont like a loud vehicle.

 

[WCounts]

Big rigs don't have um.

 

[Bob4x4]

Big rigs don't have um.

:-laf Big rigs don't have 90 degree turns into the turbo normally nor do they have 4" inlets. They also do not put out the hp per displacement of the 5. 9.



Bob

 

[Bob4x4]

i dont work for dodge or cummins so im no expert, but i would think that the entire airfilter/intake system is built and designed by dodge. and i think that they put it there to quiet down the turbo whistle for those customers who dont like a loud vehicle.

The vanes are to increase flow... ... ... . the rest of the intake does the silencing



Bob

 

[nps]

Bob - ever get tired of fighting ignorance?

 

[steved]

No... It will not help performance, so leave it there.

When they get half cocked in the inlet, they affect performance... that's how I found them in my 04. 5... I have over 100k on my truck WITHOUT the vanes... someone in California now owns them...



I would not leave them in just for the peace of mind they are not blocking airflow...



And FWIW, I can still get 23mpg running 4. 10s so it must not affect mileage much. The silencer ring affected my mileage more than the vanes.



steved

 

[opjohnny]

They vanes help reduce turbulence in the air stream when the air turns the corner. If designed correctly don't have much pressure drop. Air on the inside of the turn runs into the air on the outside of the turn and causes the turbulence. Probably reduces the sound also. It keeps the air in laminar flow. If the elbow was further form the intake it would be less a problem. You don't want the turbo seeing turbulent air. Its ok for the heat exchanger side to have turbulent air, better.

 

[steved]

They vanes help reduce turbulence in the air stream when the air turns the corner. If designed correctly don't have much pressure drop. Air on the inside of the turn runs into the air on the outside of the turn and causes the turbulence. Probably reduces the sound also. It keeps the air in laminar flow. If the elbow was further form the intake it would be less a problem. You don't want the turbo seeing turbulent air. Its ok for the heat exchanger side to have turbulent air, better.

While I agree, what good are they if the vanes are blocking the turbo inlet because they have moved out of position???



While they might be a good idea, they should have been designed BETTER.



steved

 

[Bob4x4]

Bob - ever get tired of fighting ignorance?

:-laf :-laf Yup.



Bob

 

[Panther1400]

I had a heck of a time to get them out of my 06 I don't think they could turn and block in my intake.

 

[Panther1400]

The people who feel they should be left in, are saying that the cool blue hose and aftermarket intakes without the vains are losing cfm's?

 

[BGlidewell]

The people who feel they should be left in, are saying that the cool blue hose and aftermarket intakes without the vains are losing cfm's?

I'm going to do my own CFM flow test with a fan and a pendulum against the CBH and the factory plumbing.

 

[steved]

I had a heck of a time to get them out of my 06 I don't think they could turn and block in my intake.

Mine was "twisted"... somehow the vanes had rotated "over-center" and the upper portion had rotated out into the airstream... if that makes any sense. I know for fact that 1/3 of the tube's cross section had became restricted...



I know it surprised me because my first thought was "glad that didn't get sucked into the turbo," followed by "I'll bet that's why my mileage is so low". Upon further inspection the vanes couldn't get into the turbo because the vanes are bigger than the turbo inlet... but it still surprised me.



I know there was a lot of discussion about leaving them in/taking them out, and while they might be a useful/beneficial addition (as shown on paper and dynos), if they cause airflow to become restricted because they move around inside the tube...



I guess since I am mostly stock and not looking for every last bit of HP (just mileage), having a laminar flow isn't as important as having an unrestricted inlet. I also don't pull the intake tube off that often like I'm sure some owners do.



steved

 

[Panther1400]

Mine was "twisted"... somehow the vanes had rotated "over-center" and the upper portion had rotated out into the airstream... if that makes any sense. I know for fact that 1/3 of the tube's cross section had became restricted...



I know it surprised me because my first thought was "glad that didn't get sucked into the turbo," followed by "I'll bet that's why my mileage is so low". Upon further inspection the vanes couldn't get into the turbo because the vanes are bigger than the turbo inlet... but it still surprised me.



I know there was a lot of discussion about leaving them in/taking them out, and while they might be a useful/beneficial addition (as shown on paper and dynos), if they cause airflow to become restricted because they move around inside the tube...



I guess since I am mostly stock and not looking for every last bit of HP (just mileage), having a laminar flow isn't as important as having an unrestricted inlet. I also don't pull the intake tube off that often like I'm sure some owners do.



steved

I agree with you and took mine out too.

 

[bighammer]

Dumb question: Do the 03's have these vanes? I haven't seen 'em, but I wasn't really looking either. My X in the straight tube is gone, but I didn't know there was more.