So far as I know, its very difficult. There are two "electric" systems being used in newer cars. The first has the electric motor built into the steering rack. There is a computer that recognizes how much and how fast you turn the wheel and controls the motor so you don't get abrupt start and stops to your power assist. Obviously, you would have to find a rack that is interchangable, but you'd also need any of the sensor and computer that goes with it. The difficulty with the this system is the same difficulty we had putting PS on the fiero for years, you have to find a compatible rack, width, travel, front vs rear steer, etc.
The other system being utilized has the electric motor on the steering column with an almost standard manual rack. The electric motor just assists the driver in turning the regular rack. Again, this system employs computers and sensors to control the motor smoothly. The difficulty with these systems is that you would have to integrate the entire steering column and maybe the rack too. Hypothetically you could hook up the assist to the manual fiero rack, but I doubt it. I'm betting the other racks don't have as much travel as the fiero rack (since they are power, they don't need as high a ratio). I'm guessing the "power column" would not react well to being used outside its designed range.
With both systems the computer controls somewhat prohibit the use in a fiero because frankly, its a lot of work to figure out what GM did, how many sensors they used, etc. And, its even more work to try and duplicate those complex electronics in our fieros. We may have different speed signals, and are lacking most of the other inputs. It can certainly be done, but in general, the newer the car, the more sensors, computers and controls which have to be integrated.
If I had the time or money, I'd get the parts to an early 90's MR2 and try to retrofit this system. It has the system the 88 Fiero was supposed to get, electro-hydraulic. There is still a lot of work to do, but since its an older system, there is less complexity and more is known about how it works.
I'm not trying to discourage, but it would take a lot of effort. If you have the time and money, I am quite sure anythign could be made to work. If you do work on it, let us know how it turns out.
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1988 Fiero GT
Cleveland Fiero Club
