How do I know if the turbo is working?

[Unit 5302]

True, it can be in excellent condition, but I really don't think many people treat the turbo's the way they should, my Turbo coupe was in fair condition with 114k on it, it only spooled to 13-14psi. 15 on rare occations.

As far as spooling it without a load on the engine, true the turbo may spool without power to the driveline, but it'll never hit the 15psi it should put out. Where a turbo shows wear is in boost capability. A worn turbo may only make 12psi or something like that. 12psi to 15psi makes a big performance difference, and turbo's are expensive to rebuild, or change.

I want you to know, this is not gang up on Jett week, your answers are solid, but in this case, I wouldn't buy it unless it's in running shape, or is very cheap. Just my opinion.