twin turbos

[02ilduramax]

ive done alot of looking and in all of the twin set ups ive seen the bigger turbos475 in my case feeds the smaller turbo 366 but someone told be today that it was backwards am i wrong? shouldnt the bigger turbo be the atomosperic turbo? i would think if the small turbo was atmospheric it would choke down the bigger one am i right? just looking for some info about this and more pictures if possible so i can show that the bigger turbo is the atmospheric am i wrong? sorry for the long post

 

[ikeG]

Cummins guys do it the other way most times.

 

[02ilduramax]

Cummins guys do it the other way most times.

so the smaller turbo feeds in to the bigger? would that not "choke it off" so to say once the big one is spooled?

 

[Mile_high]

Cummins guys do it the other way most times.

No, they SAY it the other way. This is due to the physical location of the turbos in their application.

 

[Dozerboy]

If anything would think it would be easier to over speed the smaller as an atmosphere... I'm assuming you have to gate the atmosphere then?




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[02ilduramax]

I am curious myself iguess I always thought the bigger Turbo was the atmospheric

 

[ikeG]

No, they SAY it the other way. This is due to the physical location of the turbos in their application.

Yes, I worded it weird, but they mount big charger straight to manifold. So it gets exhaust gases first, unlike duramax setups.

 

[WolfLMM]

IMO, you don't want a big turbo sucking through a small one. Turbos are designed to push air, not pull it. Restrictions in front of the compressor always hurt more than restrictions after the compressor wheel.

 

[02ilduramax]

So I'm correct in having the smaller Turbo in the valley and bigger one as an atmospheric like my picture?

 

[mike diesel]

Yes, I worded it weird, but they mount big charger straight to manifold. So it gets exhaust gases first, unlike duramax setups.

I've never seen it done like this

 

[Dirtymaxx03]

The bigger turbo is ALWAYS the atmospheric turbo. It would be impossible to compound pressure if the small turbo fed the large one.

 

[Mile_high]

Yes, I worded it weird, but they mount big charger straight to manifold. So it gets exhaust gases first, unlike duramax setups.

Nah. The difference is that the smaller charger is mounted on the manifold and the atmospheric charger is usually below it and outboard a little. Thus, they call it a 364 OVER 480 setup because it is physically over it. That does not mean the air goes through the smaller one first.

 

[MAXX IT OUT]

I have been thinking about this for a while, I wouldn't want to do a air filter then the small turbo then the big turbo. But i would like to do the big turbo in the valley and run the small turbo right next to it, above the valve cover and still pull air through the valley turbo. This would keep our stranded compound air side but change the exhaust routing. I sold my S480 so I never got to try it.

 

[ikeG]

Nah. The difference is that the smaller charger is mounted on the manifold and the atmospheric charger is usually below it and outboard a little. Thus, they call it a 364 OVER 480 setup because it is physically over it. That does not mean the air goes through the smaller one first.

You're right, I was wrong. But why am I thinking there is sometimes a major difference along these lines? I'm losing it...

 

[Muff]

Since we're asking goofy questions. I've always wondered how the smaller turbo doesn't just get oversped and fail? When the big charger is pushing all that air into the little charger
How does that work efficiently?

 

[mike diesel]

The only weird thing I've ever seen in a set of compounds was on a cummins...it was a normal setup only difference was that the small turbo fed the Intercooler then that fed the big turbo then big turbo fed right into the engine.

 

[Harbin_22]

The only weird thing I've ever seen in a set of compounds was on a cummins...it was a normal setup only difference was that the small turbo fed the Intercooler then that fed the big turbo then big turbo fed right into the engine.

I think H&S race truck is like that. Took me a min to figure out what was going on with it

 

[quadracer37]

The only weird thing I've ever seen in a set of compounds was on a cummins...it was a normal setup only difference was that the small turbo fed the Intercooler then that fed the big turbo then big turbo fed right into the engine.

That would result in a hotter IAT! Wonder why they did that!?

 

[DIESELMAFIAPER.LB7]

I've never seen it done like this

I have

 

[Harbin_22]

It is triple turbo but weird configuration