Stock Gen 3's...lookout for this...

[BigGunZ]

While dissecting my intake system to see what makes it tick I noticed something that may affect the performance of the turbo. In this pic, you can see that the vanes in the intake silencer form an "X" across the guide vanes below. This is how it was received from the factory...



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In this next pic, I turned the silencer so the vanes align with the inlet vanes. It's difficult to see from the pic but when the silencer is X'd, it appears that it would restrict and disrupt airflow across the inlet vanes. With the vanes aligned, the hole is visually bigger. If your keeping you intake system stock... you might want to look at this.



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[SRadke]

All that stuff is no fun. Just replace it with a smooth pipe so you can hear the whistle



-Scott

 

[BigGunZ]

All that stuff is no fun. Just replace it with a smooth pipe so you can hear the whistle

-Scott

My smooth tube is in the mail. Any time spent wrenching on a big honkin' dually is fun

 

[AndyMan]

That was a big topic a couple years ago when the 3rd gen's first came out.

I took an air chisel to mine. It just basically "lays" in there. You have to bust it up to get it out. It wasn't as violent as it sounds. You can't even tell anything was ever in that tube once you remove the "honeycomb".

 

[msperos]

5"ips pvc is the perfect size for the intake tube just scuff it up and paint it your favorite color

 

[Yo Hoot]

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More Pics

 

[67guzzler]

There were reports of reduced fuel economy if the vanes are removed or the Genos (or equivalent) tube was used. Apparently they have a purpose. If I'm not mistaken it was something to do with calming the turbulance of the airflow leading into the turbo.

 

[SP Diesel]

The sound attenuator x-baffels may be removed for better airflow, but the vanes in the elbow should remain, as they are better for the airflow.

 

[BigGunZ]

The sound attenuator x-baffels may be removed for better airflow, but the vanes in the elbow should remain, as they are better for the airflow.

Yo Hoot , Thanx for that link. Those pics clear up a few things.





I agree with leaving the vanes in the elbow, particularly on an otherwise factory intake. Having seen Hoots pics, and looking at my own rig, it appears that the overall diameter of the stock ducting is larger than needed to allow space for an accordian in the upper elbow, and vanes/baffles/rings in the intake silencer.



Knowing this, I would think that increasing the inside diameter of the silencer by gutting it, wouldn't accomplish much if anything other than to increase the noise (which ain't such a bad thing IMO). The reason I say this is because of the size of the compressor inlet. I'm only guessing but I think a smooth tube with a slightly larger diameter bore than the inlet, less radical bends than stock, and a velocity stack and flow straightener at the mouth, might be the best option and that's the direction I'm going. We'll see if it works out and I'll get dyno numbers... good... bad... or ugly.

 

[BigGunZ]

There were reports of reduced fuel economy if the vanes are removed or the Genos (or equivalent) tube was used. Apparently they have a purpose. If I'm not mistaken it was something to do with calming the turbulance of the airflow leading into the turbo.

I believe you're right. After looking at it, the "rings" or "grooves" along the inside wall would create a boundry layer (essentially a cushion of air that other air flows across) I doubt removing them will hurt since the vanes in the elbow will straighten the charge but I doubt there are any gains from it either.