Excellent discussions on the physics of drifting!
For the original post request, the weights of the RBs, here's a complete chart of Nissan engine weights. Hope it helps
Can I see more on that discussion? Physics of drifting, vol 1!
Nissan
Model Engine Capacity Format Power Torque Weight 0/100km 180SX CA18-DET 1809cc I4 turbo 130kW 225Nm 1190kg 7.0 180SX SR20-DET 1998cc I4 turbo 153kW 274Nm 1230kg 6.2 300ZX Twin Turbo VG30-DETT 2997cc V6 twin turbo 206kW 388Nm 1490kg 5.96 300ZX Convertible VG30-DE 2997cc V6 165kW 272Nm 1490kg 7.11 Bluebird SSS (U12) SR20-DET 1998cc I4 turbo 151kW 274Nm 1390kg 8.31 Bluebird SSS (U13) SR20-DET 1998cc I4 turbo 155kW 274Nm 1380kg 6.17 Cefiro SE-4 RB20-DET 1998cc I6 turbo 151kW 165Nm 1510kg 7.91 Pulsar GTiR SR20-DET 1998cc I4 turbo 172kW 284Nm 1220kg 5.89 Silvia K's CA18-DET 1809cc I4 turbo 130kW 225Nm 1119kg 6.9 Silvia K's SR20-DET 1998cc I4 turbo 153kW 274Nm 1210kg 6.2 Silvia Q's CA18-DE 1809cc I4 97kW 162Nm 1170kg n/a Silvia Q's SR20-DE 1998cc I4 118kW 188Nm 1190kg 8.62 Silvia Spec-R SR20-DET 1998cc I4 turbo 184kW 274Nm 1240kg 5.52 Skyline RS Turbo (R30) FJ20-ET 1990cc I4 turbo 142kW 225Nm n/a 6.8 Skyline GTS-X (R31) RB20-DET 1998cc I6 turbo 142kW 240Nm 1320kg 8.8 Skyline GTS-t (R32) RB20-DET 1998cc I6 turbo 160kW 263Nm 1290kg 6.89 Skyline GT-R (R32) RB26-DETT 2597cc I6 twin turbo 206kW 353Nm 1480kg 4.73 Skyline GTS25t (R33) RB25-DET 2498cc I6 turbo 184kW 274Nm 1370kg 6.21 Skyline GT-R (R33) RB26-DETT 2597cc I6 twin turbo 206kW 368Nm 1530kg 4.94 Skyline 25GT-t (R34) RB25-DETn 2498cc I6 turbo 206kW 343Nm 1410kg 6.0 Skyline GT-R (R34) RB26-DETT 2597cc I6 twin turbo 206kW 392Nm 1540kg 4.92 Terrano TD27 2698cc I4 turbo-diesel 75kW 216Nm 1760kg 17.45