The 4.0-liter twin-turbo V8 Audi CWUB was produced from 2015 to 2017 and was installed on the Audi RS6 and Audi RS7. It has direct injection and two turbochargers (IHI RHF5) and produces 560 hp and 700 Nm.
4.0 TFSI V8 EA824 family: CRDB, CEUA, CEUC, CGTA, CTFA, CTGE, CWUB, DDTA.
Specifications
| Production years | 2015-2017 |
| Displacement, cc | 3993 |
| Fuel system | direct injection |
| Power output, hp | 560 |
| Torque output, Nm | 700 |
| Cylinder block | aluminum V8 |
| Block head | aluminum 32v |
| Cylinder bore, mm | 84.5 |
| Piston stroke, mm | 89 |
| Compression ratio | 9.3 |
| Features | AVS |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | on all shafts |
| Turbocharging | two IHI RHF5 |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 8.7 |
| Fuel type | petrol |
| Euro standards | EURO 6 |
| Fuel consumption, L/100 km (for Audi RS6 2017) — city — highway — combined |
13.9 7.5 9.8 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 224 |
The engine was installed on:
- Audi RS6 C7 (4G) in 2015 – 2017;
- Audi RS7 C7 (4G) in 2015 – 2017.
Disadvantages of the Audi CWUB engine
- With proper maintenance this twin-turbo V8 can be reliable; avoid engines after serious tuning and watch the cooling;
- Poor fuel quickly destroys the Alusil coating of the cylinders;
- Turbocharger life depends on how often the oil and their mesh filters are changed;
- Owners often complain about the high-pressure fuel pump, active engine mounts and timing chain tensioners.
Frequently asked questions about the Audi CWUB
How much power does the Audi CWUB make?
The Audi CWUB develops 560 hp and 700 Nm of torque.
How much oil does the Audi CWUB take and which one?
Engine oil capacity: 8.7 liters. Recommended oil: 5W-40.
Does the Audi CWUB have a timing belt or chain?
The Audi CWUB uses a timing chain.
Is the Audi CWUB turbocharged?
Yes, the Audi CWUB is turbocharged (two IHI RHF5).
Does the Audi CWUB need valve clearance adjustment?
No, the Audi CWUB has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Audi CWUB last?
The typical lifespan of the Audi CWUB is ~300 000 km with proper maintenance.
What is the fuel consumption of the Audi CWUB?
Audi RS6 2017: city 13.9, highway 7.5, combined 9.8 L/100 km.
What cars was the Audi CWUB installed on?
Audi RS6 C7 (4G) in 2015 - 2017; Audi RS7 C7 (4G) in 2015 - 2017.
What are the common problems of the Audi CWUB?
With proper maintenance this twin-turbo V8 can be reliable; avoid engines after serious tuning and watch the cooling. Poor fuel quickly destroys the Alusil coating of the cylinders. All known problems.
