Just curious.. I was browsing through the turbonetics site and a question came up.
Can a compressor wheel from a big shaft setup be mated with a turbine wheel that's a standard shaft? What's the main difference (if any) between the two?

 

ok dumb question, i just realized that the question answered itself lol..

How can you tell (physically) from a big shaft and a standard shaft?

 

just looking at a turbo, you cant, but if you have them side by side, looking at the compressor shaft you will see the difference, a small difference.