A diesel and gas turbo are sized differently. If you did use a 1.9 diesel turbo on a gas, it would run out of breath at a very low RPM. I also believe you could over spin the turbo at higher loads. The last turbo diesel I used that matched 'about right' was a 3.0 liter diesel for a 1.8 liter gas.
I hope others will chime in. If you could find a compressor map, you could see for yourself.
25 years ago Jeff Moss/Aaron/Velocity did a 1.6TD with clipped exhaust wheel on an ABA with Electromotive TEC. It made impressive power. European Car did a thing on it back in the day.
would the power output of the donor engine not get you close enough?
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