Is anyone else concerned that the 6.7 uses a similar VGT actuator design that was used on the 6.0? It once again uses engine oil pressure to adjust the VGT vanes. I prefer the electric motor actuator on the 6.4. I remember reading that it's much faster to react and far easier to tell if it isn't working.

Didn't the 6.0's have problems with the VGT vanes sticking? That was one bonus of the 6.4's electric actuator, it had more torque to break through any soot.

 

I never had a 6.0 but I can tell you that the performance of the 6.7 turbo is pretty amazing as long as you don't mind not knowing it is there.

I did sit in my truck while the service tech. performed a sys diagnostic from his laptop and heard the turbo go through it's cycle. Really impressive. The diag program ran the turbo through it's range of motion and the whistle was amazing at idle.

Perhaps we 6.7 drivers should make certain that we idle after hard running to cool things down?

 

I have always idled my trucks for a short period of time regardless of how I have run them prior to shut down, even my gasers, (just a lot less time for them). The harder they have been run the longer the idle time. I don't like not having a pyro in this truck so I guess I just have to go by time. Fortunately I don't mind sitting in this one while it cools down, I hope that feeling lasts.

 

It is operated by oil...so this means that you will have to ensure good oil in this thing. Don't run extend oil intervals.

It is strange that they went from the electronic back to oil.

 

They must have had a good reason. I hope.

 

Well I hope the reason isn't something like navistar having a patent on an electric motor controlled actuator.

In any event, it won't stop me from buying a 2011. I just found it very interesting to see they reverted back to an old design that unfortunately was used on an engine with a less than desirable track record.

 

Most 6.0s never had a problem w/ the VGT actuator itself, It was primarily that it took Garrett a while to get the housings machined correctly so the vanes wouldn't stick. By 06-07 Garrett had figured it out and you don't see many problems with the VGT sticking at all. Not to mention the fact that ULSD burns much cleaner than the LSD that was being used when the 6.0 came out. The LSD produced much more soot which tended to clog up multiple things on the 6.0. BTW the turbo housing on the 6.7 should stay significantly cooler than the 6.0 b/c it is water cooled by the primary cooling system...IIRC. Turbo cool downs should be a lot less of an issue than with older trucks.