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Aside from having to replace a good bit of your exhaust system, what concerns me is the turbo oil feed and return. I haven't looked at a non-turbo block, but are there pre-drilled holes (plugged of course) for both the feed and return? If not, that's a major issue.
Personally, if I owned a non-turbo that I loved and just wanted some additional performance, I'd look into exhaust,ignition tuning systems, a lighter flywheel and possibly even a new cam before attempting a turbo retro fit. I'm sure there are some rather simple things to do to give you at least what you'd get with a base boost turbocharged system.
Another thing that's of issue with a turbo system is the added heat factor. If I'm not mistaken, all turbo fitted cars have a radiator that's different than the non T car. The turbo car radiator is designed to compensate for the increased heat levels of the engine. The additional heat comes from a number of places. One being all that additional exposed metal leading into and out of the turbo, plus the intake air that passes through the turbo often reaches 200 degrees and above! That'll heat up an engine quick!
I have a temperature guage sensor fitted onto the intake side (after turbo) of my intercooler, and a typical operating air temp coming out of the turbo on a cool day is 120 degrees. Go up a hill and that temp will hit 180 and above. Just sitting in traffic the intake temp will reach 180. Even an intercooler isn't going to help at all in that situation. On a hot day, just amp all those temps up considerably. The turbo designed radiator is crucial.
In a non T car, the air going into the engine is considerably cooler - whatever the ambient temp is. In fact, a non-T car has that airbox intake device that pulls air heated by the exhaust pipe. That's because even at moderate ambient temps the intake air is often too cool for the engine to run efficiently! With a turbocharged car, the struggle is to keep the heat to a minimum.
Before summer hit here in CA, and because I often drive into the hot side of the city (the infamous San Fernando valley), I was worried about overheating my 82T. Now having driven in some seriously hot situations, I'm pleased that the car cooling system seems to handle it well. If and when the cooling fan turns on, the engine temps come down rather quickly. Mind you, when it is hot, I don't ask much out of the engine by way of performance. Just stay running and keep me moving.
So unless you have all the requisite turbo sub-systems, adding a turbo could be disastrous.
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