Just got a OE Air cleaner box and hoses for my 2005

[AH64ID]

I have seen folks use PVC. It is likely better than OEM at some airflows, but I’m not sure it would be better at low airflow due to the abrupt change at the transition to the bottle elbow.

 

[Ozymandias]

Im looking at this OE middle plastic middle piece with the thick X vein inside. And it does also have "side chamber baffles" design. Those could be to trap turbo noise. Even the X baffle has thousands of little round recesses molded into it. It looks to me like it would restrict smooth air flow. Better off just putting a 5" PVC pipe in the middle. Or just use a cool hose or AFE 'S' tube

Keep - it - stock.
Safe your money, there is NO benefit from that stuff on a factory engine.
They know their business at Cummins to design an intake that fits the needs of the engine.


No pictures here, but looks like a bunch of flat bananas in the elbow.

 

[Ozymandias]

The Turbo takes the air in that he needs - as long as there isn't a rats nest in the box you gain nothing.
This is entirely different the a naturally aspirated Gas engine where you want the greatest flow to make some horsepower. Here - no gain at all.
Safe your money now, you'll need it in the future for maintenance.

 

[GSP7]

My elbows are out in the shop soaking in vinegar to remove the stains, so I cant look at them to see the Inside diameter. I might just modify my K&N 'S' tube to attach to the OE filter box. Just have to cut a couple inches of length off so it will meet the box and use a rubber boot to attach to the box

Here we go. 5" OD OE middle piece is to big if you replaced it with a piece PVC

I might just modify my K&N 'S' tube to attach to the OE filter box. Just have to cut a couple inches of length off so it will meet the box and use a rubber coupler boot to attach to the box

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[Ozymandias]

Just think about it - if this would be the ideal solution.
Don't you think Cummins would have gone this cheap way with just a plain rubber hose instead of our factory elbow?
Noise is not a case in this intake as there is an Intercooler and a turbo that takes all the intake noise away.
This thing is for optimization of flow.

Clean yours.

 

[AH64ID]

Just think about it - if this would be the ideal solution.
Don't you think Cummins would have gone this cheap way with just a plain rubber hose instead of our factory elbow?
Noise is not a case in this intake as there is an Intercooler and a turbo that takes all the intake noise away.
This thing is for optimization of flow.

Clean yours.

The stock tube between the elbows is not designed around flow, it’s designed around noise.

There is a lot of room for improvement on that piece.

That being said the entire stock setup is better than just a hose, like the K&N is.

 

[GSP7]

The Turbo takes the air in that he needs -
This is entirely different the a naturally aspirated Gas engine where you want the greatest flow to make some horsepower. Here - no gain at all.
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You are Absolutely Correct
I just want the stock air box and good paper filter rather than the worthless K&N filter kit that the previous owner stuck on there. Im not too concerned with the piping to the turbo, just simple and clean , dont need any "wiz-bang" gimmicks

The stock plastic piece with baffles in side between the rubber elbows is just a noise suppressor. The later trucks they even added foam to it . A guy researched the patents, and they are designed as a noise suppressor only

 

[CharlesinGA]

Just be sure and use the 4 inch thick filter, and not the 2 inch one. Lots more filter surface area. NAPA 9946 is the 4 inch one and NAPA 2846 is the 2 inch thick one. Both fit in the stock air filter box.

Now you'all have me thinking I need to find the '05 and later elbow with the guide vanes in it, if it helps that much.

And its VANES not veins!

Charles

 

[slowmover]

lol… you obviously never seen the inside to the stock tube

The stock tube makes a ton of turbulence. It’s designed to muffle the turbo, not improve airflow.

I’ve used and tested both. It was your recommendation some years back after I asked you that I try the AIRAID as an experiment to improve steady-state FE. On this stock truck it was not of benefit. Once the T/C lit off, sure, it pulled more air more easily.

But in all other ways it’s a dud. Works against FE as turbulence at the T/C intake is dramatically increased.

The stock intake tube doesn’t allow that turbulence. It’s very easy to tailor power against load as a result. No missteps. No throttle-finagling as with the AIRAID.

I used it for years. Many conditions. Recently changed back. No comparison when in transitional state change. That set is a key to high average MPG.

Lowering air intake restrictions is better done ahead of the filter box assuming temp control is maintained in all but highest demand & high ambient temp conditions under a load.

105F throughout operating range.
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[slowmover]

“The stock plastic piece with baffles in side between the rubber elbows is just a noise suppressor. The later trucks they even added foam to it . A guy researched the patents, and they are designed as a noise suppressor only”


This is like believing the “silencer ring” is of no benefit except in sound abatement. Remove it and turbulence is increased. Bad move.


The 2014+ air intake changes illustrate this re temp control versus flow demand. (VVT plus more sophisticated software also changes up what is desirable or possible). Very short-time admittance of cold air under tightly-defined conditions.

Turbulence is never of benefit with a T/C. It’s just more obvious a barrier with early HPCR.

105F air temp with lowest turbulence is what works.
Factory engineering emphasis.

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[slowmover]

FWIW, I’ll try the turning vanes in my 555 if they’ll fit, or try with the later intake set as a whole.

This device also an @AH64ID recommendation from that advice request of years ago. I just haven’t gotten around to it.

Testing by others via data-logging shows an improvement.

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[slowmover]

https://www.dropbox.com/s/dmc309u4x9rgtoj/ram CIA damper.mov?dl=0

A demand-only CAI is also on the list. The infamous toilet-bowl flange air box mod plus an HVAC back-draft damper.

Same data-logger contributor as above. A quarter-mile racer. Retired engineer. Used to crunching data on small changes when 1/100-sec counts.

Got tired of 18-MPG solo and recently in the 22-23 MPG range after a slew of restoration & repairs to bring an ‘06 back to new. Some changes such as these:

1). Momentary restriction reduction under load otherwise preserving air inlet temps.

2). Air-straightening improvements.

3). Some minor aero additions.

4). . Improved driver skill (biggest change).

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[AH64ID]

Noise suppression, turbulence, and decreased efficiency go hand in hand. You have to disrupt airflow to reduce the noise signature.

Exhaust, intake, turbo’s, turbine engines, etc all are less efficient the quieter they are.

 

[slowmover]

Noise suppression, turbulence, and decreased efficiency go hand in hand. You have to disrupt airflow to reduce the noise signature.

Exhaust, intake, turbo’s, turbine engines, etc all are less efficient the quieter they are.

Up to the point FE is reduced.
That’s the balance to preserve.

These trucks have always been overpowered. It’s the HP increase between the ears needed by operators that’s been missing.

Whining about grade ascent speed is the classic example when what should concern anyone is control of the descent.

FE is best efficiency.

.

 

[Regcabguy]

I've used the M.I.T. spacer unit and the Cool Blue Hose. I didn't have an issue with slight noise increase but I didn't see an increase in fuel economy. Skinny pedal use and EFI helped somewhat and selling my 2200# popup cabover gained me 3+ mpg. Even restoring the airdam up front didn't help much. I wish it weren't so but that's my observations.

 

[GSP7]

I've used the M.I.T. spacer unit and the Cool Blue Hose. .........

I give up.... What is a "M.I.T. spacer unit" ? ? ?


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[Regcabguy]

I give up.... What is a "M.I.T. spacer unit" ? ? ?


.

I might have the name wrong. It's the replacement piece on the right in the video.

 

[AH64ID]

I give up.... What is a "M.I.T. spacer unit" ? ? ?


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The Airaid part I’ve mentioned. Modular Intake Tube.

Aerodynamically it’s the best piece I’ve seen available for these trucks. Smoothest airflow possible, especially when coupled with the 04.5-07 lower elbow that has the directional vanes. You want low turbulence over sheer volume, this does that since the air filter is the main flow restriction.

 

[CharlesinGA]

Kinda funny, in the video the guy removed the guide vanes from the lower elbow. I agree they would improve the airflow by smoothing out the turn.

My concern with the guide vanes is the possibility of them breaking up and getting ingested and trashing the turbo, but since its a Dodge part and has been around a long time, I guess that has not happened.

Someone needs to make a new insert to go in the Modular Intake Tube that has a shutoff butterfly in it (to shut off air in event of a runaway engine) Mopar calls this part a "RESONATOR, Air Cleaner" (discontinued)

The lower elbow, for a 2005 is listed as "Mopar 53032847AB
Fuel Clean Air Duct, 2004-2008 Mopar 53032847AB" (still available for $115)

Now, I know the turbo on the 305 HO engine is a couple of MM smaller than the 325 engine, but is the outside of the turbo the same? As in, will the elbow fit on the earlier models, such as my 305 HO 2003 model? Apparently the vanes are part of the elbow, not listed or show separately.

Charles

 

[AH64ID]

Kinda funny, in the video the guy removed the guide vanes from the lower elbow. I agree they would improve the airflow by smoothing out the turn.

My concern with the guide vanes is the possibility of them breaking up and getting ingested and trashing the turbo, but since its a Dodge part and has been around a long time, I guess that has not happened.

I recall reading it made the turbo up to 30% more efficient, I’m guessing at low airflow.

I wouldn’t be too worried about it breaking apart.