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If you're hell bent on going forced induction try sourcing a BMW N20 motor and swap the entire setup... You could change the turbo install a bigger intercooler, CO2 or nitrous and be north of 350hp easily. Good luck, it's not for the faint of heart.
I hear ya!! I've built about 12 e36 BMW turbo cars/motors so I know EXACTLY what you mean!! My direction on this project has changed due to the fact that I have a spare S50 turbo built motor laying around the shop...so now I'm looking for a roller/shell for the swap/turbo effort. The REAL issue with these projects is tuning. I know 3-4 guys that can tune obd1/obd2 DME's so that's the direction I'm heading. For now, a standalone is just not in my future and the availability of S14 motors and their value has pushed me in another direction. I will find a roller/shell swap in a M50 based 8.5:1 built motor with a nice little GT3582HTA turbo and have a blast. Nice street/crusing car. Appreciate your input...obviously, I've seen your build and the troubles you've had. What an effort!!
Time to get this moving. S14 turbo build on the way. Stock rebuild, spacer gasket/with sealing rings to lower compression to 8.5:1. Simple twin "Y" manifold feeding a bottom mount GT30R twin scroll with internal wastegate. 15psi max boost. Megasquirt plug and play using 60-1 trigger and MAP sensor. I'll do all of the electronics first. I will start around June and finish by September. Then over the winter, I'll dissemble everything and do a complete restoration. Should be fun. Follow along as I once again change direction!! Muuuahhhhaaa!!