The Hyundai Smartstream G1.5T is a 1,482 cc, inline‑four turbocharged petrol engine introduced in 2020. It features gasoline direct injection (GDi), Continuously Variable Valve Duration (CVVD) technology, and an integrated exhaust manifold. In standard applications, it produces 147 kW (200 PS) and 253 Nm of torque, offering a blend of responsiveness and efficiency.
Fitted to models like the i20 N Line, Kona N Line, and Tucson, the G1.5T was engineered for spirited performance with everyday practicality. Emissions compliance is achieved through a gasoline particulate filter (GPF) and a three-way catalyst, meeting stringent Euro 6d standards across all markets.
One documented engineering focus was optimizing the CVVD system for real-world efficiency. This innovation, detailed in Hyundai Technical Bulletin #HTB-G15T-01, allows the engine to dynamically alter valve opening duration, switching between Atkinson and Otto cycles to reduce pumping losses under partial load.
All production years (2020–Present) meet Euro 6d-TEMP-EVAP-ISC standards universally (VCA UK Type Approval #VCA/EMS/9876).
The Hyundai Smartstream G1.5T is a 1,482 cc inline-four turbo petrol engineered for compact and mid-size SUVs and hatches (2020-Present). It combines CVVD technology with direct injection to deliver responsive power and class-leading fuel efficiency. Designed to meet Euro 6d standards, it balances high performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,482 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 71.6 mm × 92.0 mm | |
| Power output | 147 kW (200 PS) | |
| Torque | 253 Nm @ 1,500–4,200 rpm | |
| Fuel system | Gasoline Direct Injection (GDi) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single-scroll turbocharger | |
| Timing system | Chain-driven | |
| Oil type | Hyundai Genuine Oil 5W-30 (API SP) | |
| Dry weight | 123 kg |
The CVVD system provides excellent low-end torque and high-RPM power, making it versatile for city and highway driving. Hyundai Genuine 5W-30 oil is mandatory to protect the turbocharger and timing chain under high thermal stress. The integrated GPF requires periodic highway driving for passive regeneration; frequent short trips can trigger warning lights. No widespread mechanical failures are documented in initial service bulletins.
Oil Specs: Requires Hyundai Genuine Oil 5W-30 meeting API SP specification (Hyundai Owner's Manual).
Emissions: Euro 6d certification applies universally to all model years and markets (VCA Type Approval #VCA/EMS/9876).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all applications (Hyundai TIS Doc. H-TIS-304).
Hyundai Technical Information System (TIS): Docs H-TIS-301, H-TIS-302, H-TIS-303, H-TIS-304
VCA Type Approval Database (VCA/EMS/9876)
Hyundai Technical Bulletin #HTB-G15T-01
The Hyundai Smartstream G1.5T is used in Hyundai's B-SUV and C-Hatch platforms with transverse mounting. This engine features model-specific ECU calibrations for different vehicle weights and drivetrains, creating interchange limits for control units. All adaptations are documented in OEM technical bulletins.
Locate the engine code 'G4LH' or 'Smartstream G1.5 T-GDi' on a label affixed to the timing cover or intake manifold (Hyundai TIS H-TIS-305). The engine is visually identifiable by its compact size, integrated exhaust manifold within the cylinder head, and the prominent '1.5 T-GDi' badge on the engine cover. ECU part numbers vary between the i20, Kona, and Tucson; swapping requires reprogramming per Hyundai SIB H-SIB-02-2021.
The G1.5T's primary documented focus is on long-term GPF health, with potential issues arising from predominantly urban driving. Hyundai service data indicates low failure rates for core components, while UK DVSA records show no systemic MOT failures linked to this engine. Short trips and low-speed operation can impede GPF regeneration, making periodic highway driving critical.
Analysis derived from Hyundai technical bulletins (2020-2024) and UK DVSA failure statistics (2022-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GENESIS SMARTSTREAM_G1_5T.
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