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  1. #1
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    Prime example of turbo over speed

    Got a turbo in for rebuilding yesterday (not an N54) and found a perfect example of how much damage turbo over speed can cause if left unchecked for long periods of time. This is a on a dodge sprinter with an electronic box to control boost, they are known to go bad and most of these are work trucks, the driver just holds it to the floor and goes about his day. With the box failed, boost which equates to turbo speed is left unchecked, eventually the wheel basically just bursts like a balloon. Billet wheels virtually eliminate this problem but over speed can cause other issues and should be avoided as much as possible, stock frame upgrades when pushed hard are pretty much running in an over speed condition at all times under high load.
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    I wonder how long did it take that to happen? Of course I know it depends on the actual speed that was reached.

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    That'll buff right out. lol
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    That's awesome.

    Why do you say a billet wheel eliminates this problem? It would depend on the particular wheel in question...

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    Click here to enlarge Originally Posted by trufus Click here to enlarge
    That's awesome.

    Why do you say a billet wheel eliminates this problem? It would depend on the particular wheel in question...
    Because wheels cut from a solid piece of forged aluminum are much much stronger than a cast aluminum wheel. Getting a billet wheel to burst from ove rspeed is next to impossible. You can have a failure that scatters pieces everywhere, but a burst compressor wheel from over speed is virtually eliminated when using a billet wheel.

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    Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
    Because wheels cut from a solid piece of forged aluminum are much much stronger than a cast aluminum wheel. Getting a billet wheel to burst from ove rspeed is next to impossible. You can have a failure that scatters pieces everywhere, but a burst compressor wheel from over speed is virtually eliminated when using a billet wheel.
    The key is that the wheel has to be machined from a stronger material to see the benefit. It's possible to make a wheel out of a billet of weaker material that might fail earlier than that cast piece.

    Just want to make it clear that there are $#@!ty billet products and there are quality billet products, just like everything else on the market.

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    Click here to enlarge Originally Posted by trufus Click here to enlarge
    The key is that the wheel has to be machined from a stronger material to see the benefit. It's possible to make a wheel out of a billet of weaker material that might fail earlier than that cast piece.

    Just want to make it clear that there are $#@!ty billet products and there are quality billet products, just like everything else on the market.
    Actually thats not the key at all. Not sure why you are trying to dispute the fact that anything cut from a billet forging is ALWAYS going to be stronger than a cast piece of similar material. Be it pistons, be it blocks, be it compressor wheels, be it simple brackets. Billet pieces cut from a one piece forging are ALWAYS stronger than a cast piece even if the material is identical.

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    Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
    Actually thats not the key at all. Not sure why you are trying to dispute the fact that anything cut from a billet forging is ALWAYS going to be stronger than a cast piece of similar material. Be it pistons, be it blocks, be it compressor wheels, be it simple brackets. Billet pieces cut from a one piece forging are ALWAYS stronger than a cast piece even if the material is identical.
    I mostly agree with the statements you've just made. I'm afraid my last post might not have been clear but I don't want to get pedantic.

    Thanks for sharing the pics!

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    Looks like the compressor couldn't Dodge what was in store for it. Cool pictures, thanks for sharing.

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    Most turbines are made using investment casting DS and SC investment casting which are just as strong as forged billet.

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    This is more of a general topic isn't it? Or did you want to leave it in N54?

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    Don't care, threw it up for fun sake. You can pull down if you want.

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    Click here to enlarge Originally Posted by Jewber Click here to enlarge
    Most turbines are made using investment casting DS and SC investment casting which are just as strong as forged billet.
    Talking aluminum here boys, compressors not turbines, go ahead and let us all know how investment cast aluminum is as strong as forged billets. While you are at it, let all the people who are spending their hard earned money to build their engine with forged components know they are wasting their money as their cast counterparts are just as strong. Should be an interesting read.
    Last edited by Tony@VargasTurboTech; 02-05-2014 at 12:43 AM.

  14. #14
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    Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
    Don't care, threw it up for fun sake. You can pull down if you want.
    I put it in general where I think it fits better.

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    Catastrophic failure is a $#@!. Did the engine ingest any of the remmenants?

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