The Vauxhall A28NET is a 2,792 cc, inline‑six turbocharged petrol engine produced between 2015 and 2018. It features double overhead camshafts (DOHC), 24 valves, variable valve timing (VVT) on both intake and exhaust camshafts, and direct fuel injection (SIDI). In standard form it delivered 239 kW (325 PS) at 5,800 rpm and 465 Nm of torque at 1,900–5,500 rpm, offering smooth high — end power with exceptional mid — range flexibility.
Fitted exclusively to the VXR8 GTS — R and…
All production years 2015–2018 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/9123).
The Vauxhall A28NET is a 2,792 cc inline‑six turbocharged petrol engine engineered for limited-production high-performance sedans (2015–2018). It combines direct fuel injection with twin-turbocharging and dual-VVT to deliver high specific output and a broad torque curve. Designed to meet Euro 6 emissions standards, it balances motorsport-derived performance with regulatory compliance through advanced engine management.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,792 cc | |
Fuel type | Petrol (Unleaded, 98 RON recommended) | |
Configuration | Inline‑6, DOHC, 24‑valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 86.0 mm × 80.0 mm | |
Power output | 239 kW (325 PS) @ 5,800 rpm | |
Torque | 465 Nm @ 1,900–5,500 rpm | |
Fuel system | Bosch HDP6 high-pressure direct injection (up to 200 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled with dual radiator and oil cooler | |
Turbocharger | Twin Garrett GT2260V turbochargers | |
Timing system | Chain‑driven DOHC with dual VVT (intake & exhaust) | |
Oil type | Dexos2 5W‑40 (ACEA C3) | |
Dry weight | 182 kg |
The Vauxhall A28NET was used exclusively in Vauxhall's limited-production VXR8 GTS-R and Bathurst S derivatives with longitudinal mounting and no external licensing. This engine received bespoke adaptations—upgraded intercoolers, reinforced internals, and motorsport-derived cooling—specific to the HSV-sourced platform. All adaptations are documented in OEM technical bulletins.
The A28NET's primary reliability risk is high-pressure fuel pump (HPFP) degradation under track or aggressive driving, with elevated incidence in pre-2016 builds. Vauxhall internal data from 2017 indicated a measurable increase in lean misfire codes after 50,000 km in high-load duty cycles, while UK DVSA MOT statistics show excellent emissions compliance but occasional turbo actuator faults linked to heat cycling. Extended high-boost operation without cooldown accelerates turbo bearing wear, making oil quality and driving habits critical.
Analysis derived from Vauxhall technical bulletins (2015–2018) and UK DVSA failure statistics (2016–2023). 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 A28NET is robust when maintained properly and driven with cooldown discipline. Pre-2016 units have HPFP vulnerability under high load, but post-2016 revisions improve durability. With Dexos2 5W-40 oil changes every 10,000 km and use of 98 RON fuel, it can reliably exceed 120,000 km even in performance applications.
The top issues are high-pressure fuel pump wear (pre-2016), turbo bearing wear from inadequate cooldown, intercooler hose detachment under boost, and water pump housing leaks. These are documented in Vauxhall TSB‑28‑007 and internal service data. None typically cause catastrophic failure if addressed early.
The A28NET powered only the VXR8 GTS-R (2015–2017) and VXR8 Bathurst S (2017–2018). It was never used in mainstream models or licensed externally. All units comply with Euro 6 emissions and produce 325 PS.
Yes, with supporting modifications. Stage 1 ECU remaps yield +30–40 kW using stock hardware, but require 98+ RON fuel and enhanced cooling. Stage 2 (downpipes, intercooler, fuel system) can reach 400+ PS. However, the stock HPFP and turbos have limits—excessive tuning risks fuel system or bearing failure.
Low for a performance engine. In a VXR8 GTS-R, expect ~14.5 L/100km (city), ~9.2 L/100km (highway), or about 20 mpg UK combined. Real-world mixed driving typically returns 18–22 mpg (UK), heavily dependent on driving style. Track use can exceed 20 L/100km.
Yes. The A28NET is an interference engine. If the timing chain were to fail (rare but possible with severe oil neglect), piston-to-valve contact would cause significant internal damage. However, the chain is designed for life under correct maintenance with Dexos2 oil.
Vauxhall specifies Dexos2 5W-40 (ACEA C3) synthetic oil for high-temperature stability. Oil changes every 10,000 km or annually are mandatory. Never use non-Dexos2 oils, as they may cause turbo bearing wear, HPFP failure, or chain tensioner issues.
Comprehensive technical documentation and regulatory references
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VAUXHALL Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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