Unison ring out of a Duramax?

We have checked into this as well... It's a tough fix. Mostly though due to cost concerns. Our solution at this point is remove/clean/de-rust/re-install/educate. Starting and running the trucks with the VGT seems to be the biggest issue. Carbon build up is an issue we have never seen. Only rust. This seems to be caused by A: sitting for long periods without running or B: compromised EGR coolers and owners that don't fix them right away. Instead they just keep adding water to the cooling system.

Nickel plating the housings has been our best/most cost effective solution to date...

The stock unison ring is stainless.

DarinCraft said:

Thanks for the info. You said you looked into ceramic coating the turbo internals. What made you reconsider?

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The costs mostly... and technical hurdles in the application process.

mike 6.0 said:

If stock unison ring is ss then why and how does it rust? Also had housing replaced after unison cleaning, due to truck sitting. What is normal vgt duty cycle% and how do you know when to clean?

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Stainless can rust. It's just not as prone to it.

You clean them when they stick. You will probably get an over-boost or under-boost code at this time.

jerg_064 said:

Trying not to misunderstand you; are you saying that soot/etc... from long idle periods really isn't a problem?

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Not in our experience. That doesn't mean it isn't though.

jerg_064 said:

Similar to stuff used in some weapons like POF's "NP3" with which they claim you don't even need to lube the moving parts??
"NP3™ is a combination of a nickel alloy plating combined with
Polytetrafluoethylene aka Teflon. The plating components with
electroless or autocatalytic nickel is one of the most rapidly
developing metal finishing processes. The advantages of coating
uniformity, corrosion resistance and hardness are providing designers
with opportunities to protect and improve base materials in ways that
were not previously possible."

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Sounds perfect to me:thumb:

jerg_064 said:

Meant to hit on this some more in that post...Would 'y'alls' experience entail just your Rigs and your customers who know that it could be a problem and therefor protect against it by not idling very often or switching to high idle when necessary; or does this experience also entail plenty of rigs owned/operated by people that don't know/care about this 'possible' issue?

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We get all of the above and some not even mentioned.