2UR-GSE · 5.0 NA V8. What the stock hardware is estimated to support, where it breaks first, and the honest path to more.
The Lexus IS 500 / RC F / GS F (2UR-GSE) is rated 472 hp (SAE (IS 500); RC F / GS F 467 hp · US market) at 7,100 rpm and weighs 3,891 lb (Lexus USA figure for the IS 500 (standard not stated); GS F 4,034 lb), or 8.2 lb/hp. On enthusiast estimates its stock internals are taken to about ~650 hp, the fuel system to around ~540 hp, and its naturally aspirated setup is taken to about ~520 hp before forced induction. Below: the sourced spec sheet, the limit sheet carbuildcheck analyzes against, and the platform's community-documented weak points.
Units
01 Spec sheet sourced
Engine2UR-GSE · V8
Engine code2UR-GSE
Bore × strokenot sourced in this audit
Compression12.3:1
Inductionnaturally aspirated (Atkinson cycle at cruise)
Fuel systemdual (D-4S direct plus port)
Rated power472 hp · SAE (IS 500); RC F / GS F 467 hp · US market @ 7,100 rpm
Torque395 lb-ft @ 4,800 rpm
Redlinenot sourced in this audit
Transmission8-speed Sport Direct Shift automatic
DrivetrainRWD
Curb weight3,891 lb · Lexus USA figure for the IS 500 (standard not stated); GS F 4,034 lb · 8.2 lb/hp
GenerationIS 500 F Sport Performance (2022+, the sourced car: 472 hp, 3,891 lb); RC F (2015+) and GS F (2016–2020) are rated 467 hp · 2022– (IS 500); RC F 2015–; GS F 2016–2020
rotating assembly ceiling · fails first: rotating assembly under supercharger boost · 93 AKI · no named source: site planning estimate · site planning figure ~650 hp; no named 2UR-GSE tuner source with a limit was fetched
Induction ceiling~520 hp
naturally aspirated ceiling (bolt-ons and cam) · fails first: NA ceiling on an already-optimised V8 · 93 AKI · no named source: site planning estimate · site planning figure ~520 hp
Fuel system~540 hp
stock fuel-system ceiling · fails first: injectors under boost · 93 AKI · no named source: site planning estimate · site planning figure; no named source in this audit
Transmission (automatic)~520 hp
gearbox / driveline rating · fails first: 8-speed clutch packs at torque · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~520 hp
thermal ceiling for sustained load · fails first: oil temperature on track · 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: none named yet; method: the analyzer plans on the lower bound of each range
⚑Supercharger kits are the proven path (community consensus): NA gains are small on an already-optimized V8.
⚑A durable V8 by reputation; the first modifications that matter are tires, brakes and seat time.
04 The typical path
Intake → headers → tune → cams or forced induction. NA gains are modest on most platforms; the big unlock is boost, and boost starts at the fuel system.
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