Camry to dump V6 for you know what.

[hotrodalex]

Big rigs shift a ton more than regular cars because of their narrow power bands, which = more spooling up and cycling. They also run boost levels in the 30-40psi range. Higher pressure ratio = faster spinning turbo, regardless of turbo size. So it's kind of a wash.

Around town they do, but on the highway they're usually cruising in one gear, aren't they? So it could even out.

[FoMoJo]

Around town they do, but on the highway they're usually cruising in one gear, aren't they? So it could even out.

So are cars.

[Byteme]

Around town they do, but on the highway they're usually cruising in one gear, aren't they? So it could even out.

Big rigs will downshift in higher load situations, like climbing a grade, that won't tax an automobile enough to cause it to downshift. 

[12,000 RPM]

Dont big rigs have like 90 gears

[MX793]

10 to 15 speeds are very common.  I'm sure there are some with more.  The other factor with semis is that they have an extremely narrow RPM band, so even with all of the shifting the RPM variation is much less than in a car.  A CAT C12 redlined at 1800-2000 RPM.

[hotrodalex]

So are cars.

Yeah but big rigs are mostly on the highway.

[GoCougs]

Big rigs shift a ton more than regular cars because of their narrow power bands, which = more spooling up and cycling. They also run boost levels in the 30-40psi range. Higher pressure ratio = faster spinning turbo, regardless of turbo size. So it's kind of a wash.

Industrial diesels spend many many many more hours at speed vs. the average retail passenger car.

Boost is not necessarily related to turbo RPM but design of the turbine and compressor; industrial turbos are huge and spin slower.

As to boost I was throwing all industrial diesels (marine, power gen, etc.) into the same mix.

[GoCougs]

It's still nonsense.

How exactly? I full well understand that that Ford press release regarding EB design life rattled yer cage but c'mon, you're just plain trolling now.

[FoMoJo]

How exactly? I full well understand that that Ford press release regarding EB design life rattled yer cage but c'mon, you're just plain trolling now.

Let's see..

Meh, no more use in arguing. Turbos don't get as good mpg and they are not as reliable or as robust as a N/A motor. That's just the way it is and it has been addressed  .

Simple conjecture with no validation.  Nonsense.

As for Ford stating that the turbos they use will last at least 10 years or 150 thousand miles, that's a bold statement.  I expect they are quite confident that their Ecoboost engines are exceptionally robust.  The link I posted of their torture test gives a good indication of how robust they are.

[GoCougs]

Has been validated...

Yes, it was very bold for Ford to say that a $3k+ subsystem of the F150 was designed to NOT last as long as the rest of the vehicle.

[12,000 RPM]

Not when it's understood that it is a wear and tear part

Your objection makes about as much sense as complaining about having to replace shocks or brake rotors.