Here is an incomplete yet informative comparison
between Supra engines:

http://members.cox.net/jza70/4Engines.xls

Here are some more facts for you:

Displacement : 2491cc
Type : Twin Turbo Inline 6 Cyl
Valvetrain : Belt driven DOHC, 4 valves per cylinder
Fuel System : TCCS EFI, Premium Unleaded
Ignition System : Direct fire ignition
Combustion Chambers : Pent Roof
Compression Ratio : 8.5:1
Bore x Stroke : 86 x 71.5

Peak Power : 280PS [206 kW] @ 6200rpm
Peak Torque : 37.0 kgm [268 ft-lbs, 363 Nm] @ 4800rpm
Fuel Consumption : 210 g / PS*h @ 2000 rpm

Dimensions [LxWxH] :
860 x 670 x 665 mm [Manual Transmission]
845 x 670 x 665 mm [Automatic Transmission]
Weight [complete] : 217kg [480 lbs.]
Turbos : CT12A [2x]
Compressor wheel : 37/54mm
Turbine wheel : 52/42mm
Boost : 0.60-0.69kg/cm2 [8.5 - 9.8psi]
Fuel Injectors : 380cc/min High Impedance

Intake cam timing [o-c] : 3˚ BTDC - 41˚ ABDC
Exhaust cam timing [o-c] : 46˚ BBDC - 2˚ ATDC
Camshaft duration : 224 [in] 228 [ex]
Valve clearance cold : 0.15-0.25mm [in] 0.25-0.35mm [ex]
Recommended Spark plug : ND PK20TR11 / NGK BRK6EKPB11
Plug gap : 1.1mm [limit 1.3mm]
Base Ignition timing : 8-12 BTDC [jumper TE1,E1]
Idle rpm : 600-700
Recommended Engine Oil : SAE 10W30, API SH