I'm starting in on building a Lotus inspired car that I'm basing off an RX-8. I'll be using the entire drivetrain from the 8. Front and rear subframes and suspension, engine & trans. The 8 was my daily driver til it was rear ended and written off by the insurance company. There always seems to be people looking for/arguing over weights of these parts. I bought a hanging digital scale and got some hard numbers.
Front subframe- 198lbs
Rear subframe- 298lbs
Transmission- 103lbs
Complete engine including flywheel, clutch & exhaust manifold= 297lbs