I feel that for a near stock truck a slightly modified airbox (like the snorkle set-up) is just fine. I have read many posts on needed airflow for these engines in stock/near stock form. And it seems that they don't need the massive air flow that is being marketed to us. To me anything more on a stock /near stock truck is just BLING. I think what you are thinking of doing is fine and still allows for a stock appearance.

As for toying with what the almighty Cummins engineers have designed. I think they told Dodge that you need this much air flow and filtration and Dodge engineers designed what we got because they could make it fit in this truck. Is there room for improvement.........probably! Remember these are the same guys that designed our:

Fuel tank vent system.
Blend doors
Lift pumps
Transmission that go into reverse by themselves
Inadequate headlamps
on and on and on..........

Don't get me wrong all makes have their problems and I would not trade mine for another. They all need some tweaking.

 

That last one about the turbo whistle is the one that makes me scratch my head. Here's what we know: the stock setup with the white plastic guides makes the intake fairly silent. When that stuff is removed, the turbo is audible.

My question: is turbo whistle a sign of efficient airflow, inefficient airflow, or is it not related to airflow at all?

I would assume that the reason the plastic guides eliminate turbo whistle is because they direct the air in such a way as to reduce interference with itself and the turbo blades. Is turbo whistle a sign that some kind of harmonic interference is happening as the blade moves the air? Does it mean that a high pressure zone is created in front of the blade, and there is subsequent motion of air AWAY from the blade (like toward the intake aperture)? Are the stock air guides actually better at directing air in such a way that works perfectly with the pitch of the blades, thereby eliminating noise caused by air interference?

I dunno enough about fluid mechanics to make any statements or even form opinions about this.

There's also the issue of the silencer ring. Does that help dampen noise from the exhaust side of the turbo? I dunno because I never messed with mine. But if it does, then is exhaust-side turbo noise an indicator of inefficient header design? Should there be air guides in the header like in the intake?

 

Definitely agree here. I never meant to say that the design is infallible, only that modifications should be made analytically, not *****-nilly.

 

HOV, just to clarify, I haven't modified the air intake tube or removed the silencer ring on my '03. The increases in turbo noise came only from the airbox mod. Some time later I installed a 4" exhaust system, which increased turbo noise further, but there was an increase in turbo noise from just drilling the airbox holes.

As for the rest of your questions, I dunno.

 

HOV - the curved white plastic vanes in the rubber elbow mounted on the compressor housing comprise a TAG, and as such perform a useful benefit.

The black plastic insert in the intake duct's straight section, however, are there only to silence intake noise from the compressor, and can be removed if desired.

The silencer ring mounted just in front of the compressor wheel is a personal preference mod, IMO - it's an item that Dodge (not Holset) specs, IIRC.

 

Hmmm, that's interesting. Thanks.

Gotta love that 4" exhaust. I came from a Duramax, and when I popped the hood on my truck at the dealership, the turbo and exhaust were the first things I saw. I swooned.

 

Cool. that makes sense. What's your take on the airbox hole issue? (Not that you have an airbox - I've seen the pics!! )

 

I don't think the holes hurt performance, but I wouldn't count on them helping too much either!

 

I cut a big hole in mine. Was having the same issue with the filter minder pulling down on acceleration even with a new filter. Cut the hole and now it seems to breath better. I am planing on building the Whistler or getting one from XLR8R. I like his products and Mike is a great guy to work with and killer customer service.

 

Thanks Chris

Did you ever get around to posting a pic of your A-Pillar gauge mount?

 

ya got the gauge plate on. still need a tranny pan for the tranny gauge.

https://www.dieseltruckresource.com/...d.php?t=169328

sorry to hijak the thread..

 

Du-Oh!

Now I remember...


Sorry for the hijack!

 

In front of the air box towards the front under the air filter you can drill two 2 1/2 holes which will give you direct air into the airbox using a afe high flow airfilter you will feel a nice difference in response on the 06 - up they now are using a rubber molded part on the front core support which you can take a razor blade and make a nice square or rounded hole.If you go to a hardware store you can buy the wide shop vac floor tool if wanted to help direct more air to the box either way there was a big difference.

Srv Mgr for Dodge.

 

Check PSM's website (see below) because the company has performed numerous tests regarding the effects of the cooler air on EGTs, and acceleration. In addition, the modified airbox has both horsepower and torque increases compared to the OEM airbox.

NOTE: I don't work for the company. The tests are at the bottom of the page in the Test Results section.

http://www.psmdiesel.com/air_04.5.php

 

If you want to improve on a stock design get rid of the stock design..... AFE stage 2 is the only way to go in my opinion. Yes it costs some $ but beter response and MPG are what i see. For that mater almost any of the aftermarket intake systems in my research have been better than stock or a modified stock version. Just my $.02