Is there an indication of when a turbocharger is in need of overhaul?
I am approaching 1000 hours on my turbo since its last overhaul (before my ownership), and from all performance measures that I can see from the cockpit it is still doing its job without degradation. I've read here that some folks overhaul at 1000 hours - is that based on time or performance? I've also read that the turbo can last to the engine TBO. I'm a fan of IRAN/IROC in most cases so I'd like to know what I can be looking for to indicate the repair/replace is drawing near. I've searched here but didn't come up with anything that answers this for me, and although I'd guess that a decrease in performance and abnormal whining sounds from the firewall is what I should be looking for (like in a car) I'm not one to guess when it comes to my airplane...
Cheers,
Rick