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 i…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The HX is generally robust when maintained properly, but models frequently operated under high-load conditions without cooldown are prone to turbocharger failure. Later units (post-2023) show improved turbo durability. Regular servicing with Audi Longlife-2018 oil, adherence to 15,000 km service intervals, and allowing engine cooldown after spirited driving significantly extend service life beyond 150,000 km.
The most frequent issues are turbocharger bearing wear due to lack of cooldown, 48V mild-hybrid system faults, timing chain tensioner wear, and oil leaks from the valve cover. These are documented in Audi service bulletins and are largely preventable with proper maintenance. The anti-lag system and BSG unit may require attention in high-mileage performance vehicles.
The HX engine was used in the RS3 (8Y) and TT RS (8S) from 2022 to 2023. It appears in 2.5 TFSI variants. All units are equipped with 48V mild-hybrid technology for improved throttle response and torque fill, complying with Euro 6d-ISC emissions standards.
Yes, the HX responds well to ECU remapping. Stage 1 tunes typically increase output to 260–280 kW (354–381 PS) and 550–600 Nm torque. The engine's robust internals and turbocharger support moderate tuning, but supporting modifications like improved cooling, intercooler, and fuel system are recommended for sustained performance. Overboost function enhances responsiveness in stock and tuned configurations.
In real-world conditions, the HX achieves 9.8–11.5 L/100km (24–29 mpg UK) on mixed driving. Highway efficiency can reach ~8.5 L/100km (~33 mpg UK). The 48V MHEV system improves stop-start efficiency and torque fill, reducing consumption in urban driving by up to 0.8 L/100km compared to non-hybrid equivalents.
Yes, the HX is an interference engine. If the timing chain fails or skips, piston-to-valve contact can occur, resulting in severe internal damage. The front-mounted chain is generally durable, but adherence to oil change intervals is critical to ensure proper lubrication and tensioner function.
Audi specifies SAE 5W-40 oil meeting Longlife-2018 (or newer) standards. This low-SAPS formulation is essential for protecting the turbocharger, timing chain, and 48V hybrid components. Oil changes should be performed every 15,000 km or annually, whichever comes first, to maintain engine longevity and hybrid system functionality.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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