2016 4C Spider + 1985 Ferrari 308 GTS QV Black on White + 1981 Delorean DMC12 "6MT" Tesla P90 Swap!
Pics or it didnt happen!I may now have the only 4c with electric power steering.
I had been thinking about how the steering column could be modified to add the motor. Since I had time now with the stay at home order, I decided to go for it. I bought a salvage 4c steering column to cut up, so that I could save my stock one to reinstall if this did not work out. I bought a 2007 Toyota Yaris steering column and the eps control unit out of a Prius. The Toyota eps works fine in the safe mode with only 3 wires (60 amp hot, ground and key on hot). I shortened the 4c column as much as possible, but still attach to the stock bolts. I removed the Yaris steering gearbox and motor and cut down the length of the splined shaft. I welded a splined female sleeve onto to the 4c column and fitted the eps shaft into it. Then I fabricated a light sheet metal bracket to support the gearbox that bolted to the car. I also tack welded a few points to the steel section of the 4c bracket assembly. At this point everything fit fine up under the dash, but the universal joint for the column extension (to the steering rack), was not aligned correctly with the tunnel provided in the CF tub. So I had to re-drill the 4 attachment holes to allow the assembly to rotate about a half inch. Then I fabricated the new column extension by welding the Yaris u joint onto a shortened length of the 4c column end and attached it to the rack. After completing the wiring, I started the car and it all works perfectly. The effort to turn the wheel is just right, not to easy and not too hard. It is just a pleasure to drive now and will be a lot faster to autocross and less tiring doing track days. It has not dulled the steering feel at all. I still feel every bump and groove in the road. The biggest benefit is easily driving to a parking spot in a crowded lot or a hard right turn at a stop sign.
It is not an easy mod to do, but worth the effort. It took me almost 2 weeks and about half of that time, I was laying on my back with my head up under the dash.