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Just adding a turbo charger will add 30 to over 80 pounds depending on the application.
Adding a Rankine cycle would add much more weight for small gains.
For example classical boiler design calls for 10 to 12 square feet surface for each horsepower you hope to generate with a Rankine engine.
My turbocharger and added piping weighs about 60 pounds and generates about 40 horsepower worth of compressed air the way I use it, but I only use about 1/3 its max rated output.
The turbocharged diesel has no problem producing 2 to 3 times the horsepower and 10%-20% better fuel economy over an N/A diesel.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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