dllubin
Don
I would guess you are in the right ballpark. In the mid 90s, Volvo had a low pressure (~8 psi) version of their turbo that put out 160 hp from 2.4 liters. It had thinner cylinder walls than the high pressure 2.3 liter turbo, and lacked the sodium filled exhaust valves, and probably a few other things.This is not based on any real data, just guessing from what I've seen on other applications and extrapolating to the TC. I imagine the stock DOHC with only about 8-9 psi (properly tuned standalone ECU, intercooler, etc) would be around 135-140 HP and lots of torque. With a little engine prep (especially pistons) and up the boost to 12-14 psi, I'd guess maybe 160-170 HP. More internal prep and 18-20 psi should offer a good 200 HP. Get to 25 psi and you must be near the 250 mark (if the engine will hold it). Naturally each increased level of prep would also require corresponding thermal management and all components will need to be properly selected/matched. As I said, just guesstimating.