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Trucks [ Eighteen Wheelers ] Roll On Big Mama. Forum/Discussion about Eighteen Wheeler Trucks. What truck do you like or dislike? Is your favorite truck a Mack, Peterbilt, Kenworth, Marmon, Volvo or Freightliner? Which diesel engine do you prefer; Detroit Diesel, Cummins, or...

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Old 04.30.2007
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variable rate turbos?
just out of curiousity, do any of the newer trucks coming with variable rate turbos, and i'm not talking about variable waste gates? Myjohn deere service man claims that the new tractors have turbos with fins that actually chnge in angles according to engine needs for power and efficiency. Iwas just wondering if trucks were using this type of turbo, and how they are holding up.
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Old 04.30.2007
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Variable vein turbos is some thing Ford tried on the 6.0L Powserstroke with disastrous results when it comes to warranty costs.

I don't know of any big trucks that use them.
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Old 05.01.2007
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A great many of the newer trucks are using them. Basically, they change the blade angles to be more effective at various rpm ranges, and the main reason for doing this is to improve the emmisions of the engine as the engine spools up in rpm. If you look at newer trucks, you will see that there is what looks like a vacuum dashpot on the side of the turbo that operates the variable vane feature. It also involves sensors and software involving the fuel controls, so it's not something that could be retrofitted to an older engine.
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Old 05.07.2007
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I know the new '07 Cat and Cummins don't adjust boost by adjusting the fins. They adjust boost by sliding a ring over the turbine. The more area that the ring covers, the higher the boost.
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Old 05.11.2007
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This was called variable geometry turbo-charging, it is a way to bring up boost more quickly when the throttle is opened. I've driven them and they work, anything that makes for more complexity would mean more repairs down the road, I don't know that Cat or Cummins are any better, only way around the newer technology is to buy a crate motor that is no longer manufactured or go with a re-man or rebuild. I think you could still get a N-14 this way if you really have to have one.

AJ
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Old 11.27.2007
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yes
Volvo just started using them this last year on the new D11, D13 & D16 liter engines. Cummins ISX has been using it for years also. All that I have came across are manufactured by Holset. There was a recall for the D16 to change the actuator from a Delphi to a Holset. Other than that, they are pretty reliable thus far. They just need to be on the road a touch longer to give a long term analysis of reliability.
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