The 4.0-liter twin-turbo V8 Audi CTFA was produced from 2013 to 2017 and was installed on the Audi S8. It has direct injection and two turbochargers (IHI RHF5) and produces 520 hp and 650 Nm.
4.0 TFSI V8 EA824 family: CRDB, CEUA, CEUC, CGTA, CTFA, CTGE, CWUB, DDTA.
Specifications
| Production years | 2013-2017 |
| Displacement, cc | 3993 |
| Fuel system | direct injection |
| Power output, hp | 520 |
| Torque output, Nm | 650 |
| 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 | at intake and exhaust |
| 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 S8 2015) — city — highway — combined |
13.6 7.3 9.6 |
| Engine lifespan, km | ~300 000 |
| Weight, kg | 224 |
The engine was installed on:
- Audi S8 D4 (4H) in 2013 – 2017.
Disadvantages of the Audi CTFA 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 CTFA
How much power does the Audi CTFA make?
The Audi CTFA develops 520 hp and 650 Nm of torque.
How much oil does the Audi CTFA take and which one?
Engine oil capacity: 8.7 liters. Recommended oil: 5W-40.
Does the Audi CTFA have a timing belt or chain?
The Audi CTFA uses a timing chain.
Is the Audi CTFA turbocharged?
Yes, the Audi CTFA is turbocharged (two IHI RHF5).
Does the Audi CTFA need valve clearance adjustment?
No, the Audi CTFA has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Audi CTFA last?
The typical lifespan of the Audi CTFA is ~300 000 km with proper maintenance.
What is the fuel consumption of the Audi CTFA?
Audi S8 2015: city 13.6, highway 7.3, combined 9.6 L/100 km.
What cars was the Audi CTFA installed on?
Audi S8 D4 (4H) in 2013 - 2017.
What are the common problems of the Audi CTFA?
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.
