Wow - now that was an interesting 3 days of reading...................... Dougal, you have the patience of a saint!
I own a 1991 LC 80 (auto) with post-turbo EGT and fully rebuilt pump, big end bearings and radiator. Blow-by is quite low for a 275k KM engine (or so the diesel fitter who did the pump says). My turbo doesn't show any wear if I try to wiggle the shaft with the inlet hose off.
Consider this though: if my standard 1HDT turbo
was starting to signs of wear,
I have $500 AU to spend.
I buy an
ebay Supra turbo for $300 or so.
I unbolt the exhaust housing from the old and new turbos and swap them over.
I get an
ebay "Turbo Smart" boost controller and gauge for $150.
I bolt the new turbo in with controller and gauge attached, run it up slowly checking for oil flow, water flow, and leaks.
I set the boost controller to 18 psi.
I drive off into the sunset with a smile on my face due to the extra power and faster spooling.
Please tell me if this is not the cheapest, most bullet-proof standard upgrade?