The Toyota Supra Mk4 Turbo (JZA80) is rated 320 hp (SAE net 320 hp (US; Toyota USA and secondary sources); Japan 280 PS JIS (Toyota); UK 326 bhp · US market) at 5,600 rpm and weighs 3,450 lb (US curb, Supra Turbo, Toyota USA history page (standard not stated; KBB prints 3,415 lb for the 1994 automatic); Japan RZ 1,490 kg (Toyota lineage)), or 10.8 lb/hp. On enthusiast estimates its stock internals are taken to about ~700–800 hp, the fuel system to around ~450 hp, and the stock turbo(s) are taken to about ~420 hp. Below: the sourced spec sheet, the limit sheet carbuildcheck analyzes against, and the platform's community-documented weak points.
Units
01 Spec sheet sourced
Engine2JZ-GTE · 2,997 cc · I6
Engine code2JZ-GTE
Bore × stroke86 × 86 mm
Compression8.5:1
Inductionsequential twin turbo (steel-wheel turbos on US/export cars, ceramic in Japan)
Fuel systemport
Rated power320 hp · SAE net 320 hp (US; Toyota USA and secondary sources); Japan 280 PS JIS (Toyota); UK 326 bhp · US market @ 5,600 rpm
Torque315 lb-ft
Redlinenot sourced in this audit
Stock boostnot sourced in this audit
TransmissionGetrag 6MT (not offered in the US for 1996) · 4AT
DrivetrainRWD
Curb weight3,450 lb · US curb, Supra Turbo, Toyota USA history page (standard not stated; KBB prints 3,415 lb for the 1994 automatic); Japan RZ 1,490 kg (Toyota lineage) · 10.8 lb/hp
rotating assembly ceiling · fails first: head gasket lifts before the rotating assembly; then rods · 93 AKI · source: Tread Magazine, the Toyota 2JZ-GTE engine · stock-bottom-end builds commonly run to ~700 hp (t1); the site plans on ~700 hp, down from its earlier 800 hp figure, because 800 sits above what the named sources support
Induction ceiling~420 hp
stock turbo / supercharger ceiling · fails first: stock sequential twins out of efficiency; ceramic wheels (JDM) shatter earlier · 93 AKI · no named source: site planning estimate · site planning figure ~420 hp; no named source states a stock-twin ceiling
stock clutch torque capacity · fails first: stock clutch slip · no named source: site planning estimate · site planning figure; no named source in this audit
Transmission (automatic)~650 hp
gearbox / driveline rating · fails first: the A340 automatic; the Getrag V160 holds far more · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~460 hp
thermal ceiling for sustained load · fails first: oil and water temperature on sustained load · no named source: site planning estimate · site planning figure; no named source in this audit
⚑JDM-spec ceramic turbine wheels can let go past stock boost (community consensus); export steel-wheel turbos are the safe baseline.
⚑Single-turbo territory: plan a metal head gasket and ARP studs with the kit, not after it lifts.
04 The typical path
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85; the clutch on a manual, a gearbox calibration on a automatic before sticky tires.
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