compound turbochargers?????

[SLaw]

just read an article in a trade magazine that said ' 6. 7 L engines really come alive and tow well with compound turbochargers ' . is this true ? or should i be happy with stock turbo ? also does twin setup yield better fuel mileage ? wonder what hidden costs come with this setup

 

[JJPage]

Usually the reason for compounds is increased fueling. If you add fuel , you need more air to keep exhaust gas temperatures down and to completely burn that extra fuel. It is doubtful the compounds by themselves would result in better mileage, but maybe... if they were sized for your current fueling and absolutely balanced/tuned to perfection.



Unless you are prepared for all of the related consequences that may arise with a set of compounds on an emission controlled 6. 7, I would leave it as designed .

 

[Wingate]

X2 on what he said...

If you are looking for a little more power, but a Smarty jr...

 

[Surefire89]

I would definitely consider a compound setup if I was you. The stock holset Vgt 351 turbo is garbage and its just a matter of time before it grenades not under warranty. And yes your fuel economy will considerably increase if the right setup is chosen. There are setups for towing, drag racing and a mix of both make sure you get a setup that best fits your needs and works together with the rest of your setup of aftermarket parts and programming on your truck. The fuel economy will become better due to removing the stock turbo which is to small for its application creating allot of high drive pressure readings. You lower your drive pressure and your fuel economy will increase. Depending on your setup though a simple fixed vein single may be the answer.

 

[MChrist]

I know this question is for 4th gens, but the compound setup on my 3rd gen didn't alter my fuel mileage positively or negatively. Maybe it would if the VGT isn't an efficient turbo?
I also now have a 2012 5500 as a work truck and will leave it bone stock for now. I really don't feel like messing with all the junk on this thing and voiding my warranty for the "possibility" of slight mpg gains.

 

[RustyJC]

The stock holset Vgt 351 turbo is garbage and its just a matter of time before it grenades not under warranty.

Gosh, I guess I missed that valuable tidbit of tribal knowledge before I ordered my truck back in 2010. I don't think I'll tell my truck about it as I've enjoyed the trouble-free service it's provided towing our 16,000 lb 5th wheel to date. :-laf



Rusty

 

[Surefire89]

Gosh, I guess I missed that valuable tidbit of tribal knowledge before I ordered my truck back in 2010. I don't think I'll tell my truck about it as I've enjoyed the trouble-free service it's provided towing our 16,000 lb 5th wheel to date. :-laf

Rusty

How many miles do you have on your truck? Since your sig indicates you have a stock truck I take it to assume your also not getting very good fuel economy? Could be wrong though...

 

[RustyJC]

10-10. 5 MPG towing and 16-17 MPG running unloaded on the Interstate. About the same as my 2002 HO/NV5600 4. 10-geared 3500 dually. Really no complaints on the fuel economy front, and still under warranty.



Bomb it if you wish - my last truck was moderately bombed for towing (347/762 at the rear wheels). I've not seen any need to do so with this truck, however.



Rusty

 

[Surefire89]

I wasn't trying to bash sorry if it came off that way. But it looks like you may have found a lucky straw.

 

[Wertles]

This is listed under the 4th Generation section of ATS website. Looks pretty slick but not sure if it can be used for 2010+ trucks.

http://www.atsdiesel.com/ats2/produ...us-7500-Turbo-System---2007.5-2009-Dodge-6.7L

 

[CBlack]

I know this question is for 4th gens, but the compound setup on my 3rd gen didn't alter my fuel mileage positively or negatively. Maybe it would if the VGT isn't an efficient turbo?
I also now have a 2012 5500 as a work truck and will leave it bone stock for now. I really don't feel like messing with all the junk on this thing and voiding my warranty for the "possibility" of slight mpg gains.

The He351 VGT was chosen for the engine because it is very restrictive. It was the smallest turbo that Cummins could get away to use in conjunction with the EGR/DPF system while still keeping the engine running.

 

[CBlack]

just read an article in a trade magazine that said ' 6. 7 L engines really come alive and tow well with compound turbochargers ' . is this true ? or should i be happy with stock turbo ? also does twin setup yield better fuel mileage ? wonder what hidden costs come with this setup

Call Fleece Performance.

They have a new VGT out that flows A LOT better while still maintaining the braking capability.

They do recommend slightly larger nozzles, but it will work on a stock truck.

PS - Get rid of the fuel economy destroyer components.