Well I was curious about the extra oiling, so here is part of an article that mentions that.
"The turbo unit is a Toyota-made component with a mechanical wastegate that limits maximum boost to 6.8 psi. To help control heat buildup, both coolant and engine oil are circulated through the housing. The presence of an air-to-air intercooler -- also a first for Toyota -- enhances the density of the incoming charge. To further assist heat dissipation, the Turbo model is also fitted with a remote oil cooler and has individual nozzles in the cylinder block that spray oil on the piston skirts. The cam timing has been tweaked a trifle. The only other significant internal change is the installation of a new set of pistons, which lowers the compressions ratio from 9.2:1 to 8.4:1."
So there you go on part of the differences.
Russ
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