JAPAN RWD /// platform file
Toyota GR Supra 3.0 (2021+) build guide
B58 · 3.0 turbo I6. What the stock hardware is estimated to support, where it breaks first, and the honest path to more.
Same family, other generations and variants: Supra Mk4 Turbo (JZA80)
The Toyota GR Supra 3.0 (2021+) is rated 382 hp (SAE · US market) at 5,800–6,500 rpm and weighs 3,400 lb (Toyota USA weight figure for the 2021 3.0 (standard not stated)), or 8.9 lb/hp. On enthusiast estimates its stock internals are taken to about ~650–700 hp, the fuel system to around ~500 hp, and the stock turbo(s) are taken to about ~500 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
EngineB58 · I6
Bore × strokenot sourced in this audit
Compression10.2:1 (11:1 on the 2020 car)
Inductiontwin-scroll single turbo
Fuel systemdirect
Rated power382 hp · SAE · US market @ 5,800–6,500 rpm
Torque368 lb-ft @ 1,800–5,000 rpm
Redlinenot sourced in this audit
Stock boostnot sourced in this audit
TransmissionZF 8-speed automatic · 6-speed iMT (2023+)
DrivetrainRWD
Curb weight3,400 lb · Toyota USA weight figure for the 2021 3.0 (standard not stated) · 8.9 lb/hp
GenerationA90 / J29 (fifth generation) · 2021– (382 hp); the 2020 car was rated 335 hp / 365 lb-ft at 3,397 lb; 6-speed manual added for 2023
Verified againstToyota Motor North America, GR Supra races into 2021 with more power (press release, 13 Feb 2020, PR Newswire mirror) (primary, read 2026-09-06); Toyota Motor North America, GR Supra adds manual transmission for 2023 (PR Newswire mirror) (primary, read 2026-09-06) · The rated power and the mass each rest on one document.
02 What stock parts support enthusiast estimates
Engine internals~650–700 hp
rotating assembly ceiling · fails first: rods, well beyond the stock fuel system · 93 AKI / E85 mix · source: bmwtuning.co, How to build a 500 hp B58 · 600–650 whp on stock internals (t2) is roughly 700–760 crank; the site plans on ~650 hp
Induction ceiling~500 hp
stock turbo / supercharger ceiling · fails first: stock turbo out of efficiency · 93 AKI · source: Burger Motorsports, JB4 for the A90 Supra · a JB4 alone adds ~100 hp crank on the stock turbo (t1); the site plans on ~500 hp with full bolt-ons
Fuel system~500 hp
stock fuel-system ceiling · fails first: high-pressure fuel pump near 500 hp · 93 AKI · source: bmwtuning.co, How to build a 500 hp B58 · bmwtuning.co calls fueling the big limitation near 500 hp (t2); the site plans on 500 hp before port injection
Clutch (manual)~420 hp
stock clutch torque capacity · fails first: stock clutch on the 2023+ manual · no named source: site planning estimate · site planning figure; no named source in this audit
Transmission (automatic)~700 hp
gearbox / driveline rating · fails first: ZF 8HP clutch packs · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~500 hp
thermal ceiling for sustained load · fails first: charge-air heat soak · no named source: site planning estimate · site planning figure; no named source in this audit
Tuning limitsenthusiast estimates, crank hp on the stated fuel; sources: Burger Motorsports, JB4 for the A90 Supra; bmwtuning.co, How to build a 500 hp B58; method: the analyzer plans on the lower bound of each range
Planning figures, conservative by design, never a manufacturer claim. How these are used in the score →
03 Where it breaks first community-documented
The B58 HPFP is the wall around 500 hp (bmwtuning.co): bigger high-pressure pump or port injection before chasing more.
Plastic factory charge pipe pops under raised boost (community consensus). Cheap aluminium fix; do it with the first tune.
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.
Analyze your GR Supra 3.0 (2021+) build
Tap your mods, set a goal. Score, weak link, roadmap. Free, no login.
Check this build →
buying used? check the history first — the link gets you 20% off
↗Partner link
↗Partner linkPartner link: may earn carbuildcheck a commission at no extra cost to you. The stock limits, weak points and upgrade path on this page are documented independently and never influenced.
power outgrows the stock wheel and tire package firstWheelHero ↗Partner linkUS
Partner link: may earn carbuildcheck a commission at no extra cost to you. Fitment is per-platform, so check bolt pattern, center bore, offset and tire size against your own car before ordering anything, and note this retailer ships within the US. The stock limits, weak points and upgrade path on this page are documented independently.
05 Related platform files