KOREA RWD /// platform file
Kia Stinger GT / G70 3.3T (2018–2021) build guide
Lambda · 3.3 twin-turbo V6. What the stock hardware is estimated to support, where it breaks first, and the honest path to more.
The Kia Stinger GT / G70 3.3T (2018–2021) is rated 365 hp (SAE · US market) at 6,000 rpm and weighs 3,829 lb (US curb, GT RWD (AWD 4,023 lb)), or 10.5 lb/hp. On enthusiast estimates its stock internals are taken to about ~550 hp, the fuel system to around ~470 hp, and the stock turbo(s) are taken to about ~460–480 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
EngineLambda · 3,342 cc · V6
Bore × stroke92 × 83.8 mm
Compression10.0:1
Inductiontwin turbo
Fuel systemdirect (GDI)
Rated power365 hp · SAE · US market @ 6,000 rpm
Torque376 lb-ft @ 1,300–4,500 rpm
Redlinenot sourced in this audit
Stock boostnot sourced in this audit
Transmission8-speed automatic
DrivetrainRWD
Curb weight3,829 lb · US curb, GT RWD (AWD 4,023 lb) · 10.5 lb/hp
GenerationCK; the MY2022 refresh is rated 368 hp at 4,021 lb (RWD); Genesis G70 3.3T shares the 365 hp rating · 2018–2021 (US); 2022–2023 refresh 368 hp · pre-facelift (before the refresh, Kia’s term for the facelift)
Verified againstKia Media, 2018 Stinger specifications (primary, read 2026-09-06); Kia Media, 2022 Stinger overview (refresh) (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~550 hp
rotating assembly ceiling · fails first: rods and bearings (no numeric source) · 93 AKI · no named source: site planning estimate · site planning figure; no fetched page states a rod ceiling
Induction ceiling~460–480 hp
stock turbo / supercharger ceiling · fails first: stock turbos out of efficiency · 91/93 AKI, E85 mixes · source: Burger Motorsports, JB4 for Kia Stinger / Genesis G70 3.3T · a JB4 adds up to 100 whp on a stock car (t1) and Burger's locked-ECU package tops out over 450 hp (t2); the site plans on ~460 hp
Fuel system~470 hp
stock fuel-system ceiling · fails first: HPFP (Burger sells a stage-2 HPFP and port injection past this) · 93 AKI · source: Burger Motorsports, 450 horsepower Kia Stinger / Genesis package · stock fuel treated as done near ~470 hp
Transmission (automatic)~480 hp
gearbox / driveline rating · fails first: 8AT clutch packs; wants its own tune · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~450 hp
thermal ceiling for sustained load · fails first: charge-air heat exchangers · 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 Kia Stinger / Genesis G70 3.3T; Burger Motorsports, 450 horsepower Kia Stinger / Genesis package; 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
Downpipes plus heat exchangers are the proven combo (community consensus), and the 8AT wants its own tune with them.
Strong platform, smaller aftermarket. Stick to shops with Stinger dyno sheets, not promises.
04 The typical path
Stage 1 tune → intake → downpipe → intercooler → Stage 2 tune. Fueling before E85; a automatic gearbox calibration before sticky tires.
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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.
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