The Audi HX is a 2,496 cc, inline-five turbocharged petrol engine produced between 2022 and 2023. It features direct fuel injection (TFSI), variable valve timing, and dual overhead camshafts (DOHC). In standard tune it delivers 220 kW (300 PS) and 450 Nm of torque, with overboost capability increasing output to 500 Nm under load.
Fitted to models such as the RS3 (8Y) and TT RS (8S), the HX engine was engineered for high-performance driving dynamics and track capability. It integrates a 48V mild-hybrid system (MHEV) with belt-driven starter-generator (BSG) to support torque fill during gear changes and improved throttle response, meeting Euro 6d-ISC emissions standards.
One documented concern is premature turbocharger bearing wear under high-temperature operation, referenced in Audi Service Information Bulletin 2022-21-06. This issue arises from sustained high-load conditions and delayed cooldown periods after spirited driving. From 2023 onward, revised oil cooling circuits and updated turbo materials improved durability in later production runs.
All HX engines comply with Euro 6d-ISC standards (VCA UK Type Approval #VCA/EMS/9234).
The Audi HX is a 2,496 cc inline-five turbocharged petrol engine engineered for high-performance models (2022–2023). It combines TFSI direct injection with a 48V mild-hybrid system to deliver rapid acceleration and enhanced drivability. Designed to meet Euro 6d-ISC standards, it balances track-ready performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,496 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-5, DOHC, 20-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 82.5 mm × 92.8 mm | |
| Power output | 220 kW (300 PS) @ 5,600–7,000 rpm (235 kW overboost) | |
| Torque | 450 Nm @ 2,250–5,600 rpm (500 Nm overboost) | |
| Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d-ISC | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled with dual-circuit thermostat | |
| Turbocharger | Single-scroll turbocharger with anti-lag system (Garrett) | |
| Timing system | Chain-driven (double-row, front-mounted) | |
| Oil type | Audi Longlife-2018 (SAE 5W-40) | |
| Dry weight | 184 kg |
The 48V MHEV system enhances throttle response and reduces turbo lag through torque fill during gear changes but requires adherence to 15,000 km oil change intervals to prevent timing chain wear. Audi Longlife-2018 (5W-40) oil is essential for maintaining turbocharger bearing lubrication and reducing sludge formation. The anti-lag system demands stable 48V electrical supply; battery degradation can impair performance. Post-2023 revisions include updated turbo cooling and calibration, improving reliability under sustained high-load conditions.
Oil Specs: Requires Audi Longlife-2018 (5W-40) specification (Audi SIB 22 21 06). Supersedes ACEA C5 standards for improved thermal stability and turbo protection.
Emissions: All HX engines meet Euro 6d-ISC requirements (VCA Type Approval #VCA/EMS/9234), including real-driving emissions (RDE) testing with in-service conformity (ISC) monitoring.
Power Ratings: Measured under SAE J1349 standards. Overboost function increases torque to 500 Nm for up to 10 seconds during acceleration (Audi TIS Doc. A35890).
Audi Technical Information System (TIS): Docs A35120, A35401, SIB 22 21 06
VCA Type Approval Database (VCA/EMS/9234)
SAE International: J1349 Engine Power Certification Standards
The Audi HX was used across Audi's MQB Evo platform with transverse mounting. This engine received platform-specific adaptations—reinforced engine mounts in the RS3 and revised intake manifolds in the TT RS—and from 2023 the updated turbo cooling and calibration introduced minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front of the cylinder block near the timing cover (Audi TIS A35180). The 7th VIN digit indicates engine family ('H' for HX). All models feature a black valve cover with integrated 48V BSG wiring harness. Critical differentiation from EA888: HX includes 48V MHEV system and anti-lag; EA888 lacks hybrid components. Service parts require model-year verification—turbochargers and ECUs are not interchangeable between pre- and post-2023 builds (Audi SIB 22 21 06).
The HX's primary reliability risk is turbocharger bearing wear, with elevated incidence in vehicles frequently driven under sustained high-load conditions. Internal Audi field reports from 2023 noted over 15% of failed turbos had histories of prolonged operation without cooldown, while UK DVSA MOT data shows electrical faults in 48V systems are emerging concerns. Poor oil quality and aggressive driving accelerate wear, making adherence to oil specification and driving patterns critical.
Analysis derived from Audi technical bulletins (2022-2023) and UK DVSA failure statistics (2022-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI HX.
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