If I had to do this all over again from scratch I would try to find a car with a G50 conversion and swap out to a 930 engine or go directly to a 930. The number of issues you have to deal with are substantial including the internal engine oil pump, turbo oil supply/scavenge, timing, fueling, intake plumbing etc.. The 915 puts significant limitations on torque. Optimally you want the mechanical 930 scavenge pump with the corresponding 930 or sportomatic oil tank plus vent/overflow tank. All of these things will nickle and dime you to death when seeking aftermarket solutions.
OTOH, it has been an incredible journey of self-education.
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Steve
Sapere aude
1983 3.4L 911SC turbo. Sold
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