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There's no such thing as a steel wheeled turbo.  They're at least some sort of high grade stainless, up to inconel.  Not steel.

The best test is to hit the turbine with something like a small ball pein hammer, screwdriver, chisel, etc.  If it breaks, then it was ceramic and needed to be upgraded anyway.

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600 series Inconels are not magnetic. Austenitic stainlesses are also not.  There may be some stainlesses (ferritic ones) used for turbines that could be magnetic, but in general I wouldn't be making any decision on whether it's metallic or ceramic based on a magnet test.  Sadly.

one has that guitar pick looking nut and the other has a normal nut which was looks like half of it shaved off, I guess for balance. my ceramic wheels look lighter in color that came off my car and these look different. guess they are steel wheeled.

 

as mine here are rebuilt with steel wheels I was looking for a more exact way of knowing other than smashing it with a hammer or a magnet because magnets will not stick to either.

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