Re-Silenced, pre-turbo...

[rbattelle]

I'm with JHardwick... what the heck is SOTSU?



Sitting On The Stairs Upchucking?



Some Old Timers Still Understand?

 

[JHardwick]

LOL, thats all I can do



well, I need to go see how this concrete repair is coming on my porch step that the insurance company *****ed about (like anybody goes to the front of an old house anyway, lol) ..... I aint no mason, I aint no carpenter, I aint no auto mechanic ..... if it can be made I can make it, but this porch step has me stessed out

 

[Bfulgham]

A different Tangent

In posts regarding the 2100 rpm rough feeling (or vibration as some refer to it) it appears some techs. have detected the problem coming from the turbo. Was wondering if you guys have the vibration and if so has the silencer ring etc. had any effect in said 2100 vibration.

Bob(need to change my profile, 03 now)

 

[Car_nut57]

The Turbo Air Guide (TAG) is still very much an experiment on the 03 Cummins and we are trying some different configurations. This week two different trucks are trying a couple of different configurations of the honeycomb. As results become available we will be posting them on the website.



One of the things that makes this application complicated is the design of the inlet housing of the turbo. The picture is of the inlet housing with silencer ring removed. It is almost impossible to see, but near the bottom of the annual area between the outside of the housing and the inner portion a slot is machined radially about a 1/4" below the leading edge of the compressor wheel. The annual area is the area the silence ring covers so air escaping through the slot would hit the back of the silencer ring and be directed into the center intake of the turbo. This may explain why those who have removed the silencer notice spoolup is slower as that air would be traveling to some extent against the incoming air flow creating even more turbulence.



When our TAG is installed using the silencer ring in reverse the honeycomb material is as close as can be to the compressor wheel which is not the ideal distance, but does effectively block the air from the slot. In this configuration the turbo spool up is extremely fast. We are currently running tests with honeycomb that covers the entire inlet to the turbo with and without the silencer ring and will be comparing those results with the original configuration.



As for the 2,100rpm vibration or drone or what ever it is, with the TAG installed it is definitely effected, either moved up considerably in the rpm or eliminated with the original TAG configuration. We have not gotten any information back about the full coverage tests yet.



It will take some time and testing to find the most effective configuration of the TAG concept for the Cummins and we are working on that. Hopefully a combination that yields results similar to the Powerstrokes will be found as the TAG has been quite effective on the Fords.

 

[Car_nut57]

Here is a picture that shows the slot below the intake fins of the compressor wheel a little better.