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My brother bought a turbo 850 in the mid-1980s, but something was wrong with the turbo (I think it was an aftermarket unit added by a home mechanic). It went through an entire tank of gas in about 150 miles. But it was a comfortable, stable-riding, solid-feeling car, even if it did look like a lowered, wide-tire version of a shoebox.
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Steve, I'm assuming you meant mid 90's 850, the 850 didn't come out until '93. I've heard of alot of guys adding a turbo kit to a normally aspirated 850, probably the worst thing you could do to the car for longevity. Most people think that the turbo and N/A 850 differed only in the addition of the turbo itself and the software changes to run it. About the only thing that the turbo and non-turbo 850's share in common engine wise is the displacement and number of cylinders, they are almost completely different engines after that. The turbo motors had sodium filled valves, bigger cams, and forged bottom ends to handle the boost, amongst other things. The transmissions were also beefier to handle the added HP. The N/A motors were downright fragile in comparison, and the addition of a turbo is a quick ticket to problems down the road as the bottom ends of those motors were never designed to handle boost. Given what the cars cost used today, its usually far cheaper and less headache to just buy a factory turbo car if you can. Mines a 93, and the turbo option was not available at all the first year. Without the turbo the car is a real dog, although a comfortable, well handling dog. If I knew then what I know now I would have held out for a turbo car.