Turbocharger AUDI S7 Sportback (4GA / 4GF) 4.0 TFSI 420 hp

The 4.0 TFSI engine family, found in Audi models like the S4, S5, and RS6, is renowned for its power delivery and engineering complexity. This category provides exchange standard turbos designed specifically for these applications, addressing common failure points such as wastegate leaks, shaft play, and variable-geometry actuator wear. Whether you’re a professional mechanic or a hands-on owner, these remanufactured units offer a cost-effective alternative to OEM replacements without compromising on performance.

Our range is built around two core references—the IHI 9VA17 and 9VA18—selected for their direct fitment and compatibility with Audi’s 4.0 TFSI platforms. These turbos are sourced from a network of certified remanufacturers who adhere to strict quality controls, ensuring each unit undergoes thorough testing for pressure, balance, and durability before reaching the market.

Professional uses by trade

Different users approach turbo replacement with distinct priorities: garages need consistency and traceability, DIY enthusiasts seek ease of installation, and German buyers expect precision-engineered parts. Below, we outline how each group can leverage this category to resolve turbo-related issues efficiently.

• Le garagiste independant : Replace a failing turbo on a customer’s RS6 Avant with the IHI 9VA17, restoring full boost pressure and eliminating hesitation during overtaking maneuvers.
• L'automobiliste depanne : Diagnose a whining noise from the turbo area on a 2018 Audi S5 4.0 TFSI and order the correct exchange unit to avoid further damage to the CHRA assembly.
• Le passionne qui fait lui-meme : Swap a worn-out turbo on a project RS7 Sportback, using the IHI 9VA18 for a direct bolt-on solution that matches the original performance curve.
• Der deutsche Kaeufer (DACH) : Identify the exact turbo reference for a 2016 Audi S4 B9 4.0 TFSI by cross-referencing the engine code CJXC, ensuring compatibility with local workshop standards.
• Le garagiste independant : Source a remanufactured turbo for a 2019 Audi A8 4.0 TFSI with a reported loss of power, verifying the IHI 9VA17’s suitability via OEM cross-references before installation.
• L'automobiliste depanne : Address a sudden drop in boost pressure on a 2017 Audi Q7 4.0 TFSI by replacing the turbo with the IHI 9VA18, a unit known for its robust variable-geometry system.
• Der deutsche Kaeufer (DACH) : Order a core-deposit compliant turbo for a 2015 Audi S6 4.0 TFSI, ensuring the old unit is returned within the specified timeframe to avoid additional fees.

Range comparison

Below, we compare the two turbo references available for the 4.0 TFSI 420 hp platform, highlighting their key features and intended applications. Each unit is designed to meet the demands of Audi’s high-performance engines while simplifying the replacement process.

How to choose

Selecting the right turbo for a 4.0 TFSI engine requires attention to several critical factors, from engine code verification to core deposit policies. Below, we outline the key criteria that distinguish a reliable exchange unit from a risky alternative.

1. Verify the engine code (e.g., CJXC, CNTC) to ensure the turbo’s compatibility with your specific 4.0 TFSI variant, as minor differences can affect fitment and performance.
2. Check the turbo’s core deposit policy, which typically requires returning the old unit within a set timeframe to avoid additional charges or delays in processing.
3. Prioritize turbos with a documented remanufacturing process, including pressure testing, shaft balancing, and variable-geometry actuator calibration, to ensure longevity.
4. Confirm the turbo’s packaging includes OEM-equivalent gaskets and seals, reducing the risk of leaks or installation complications during the replacement process.
5. For high-mileage engines, consider turbos with reinforced housings or upgraded bearings to handle the increased stress of prolonged use without compromising reliability.
6. Ensure the supplier provides clear cross-reference data, linking the turbo to multiple OEM part numbers for flexibility in sourcing and ordering.
7. For garages, opt for turbos with batch traceability, allowing you to track the remanufacturing date and batch number for warranty or diagnostic purposes.

Storage & logistics

Storing exchange standard turbos for the 4.0 TFSI platform requires controlled conditions to preserve their condition and prevent contamination. Store units in a dry, temperature-regulated environment away from direct sunlight, and avoid stacking heavy items on top to prevent deformation. For garages, maintain a first-in-first-out rotation system to ensure older stock is used before newer arrivals, reducing the risk of shelf-life issues. Always inspect packaging for damage or moisture ingress before accepting delivery, as even minor breaches can compromise the turbo’s internal components.

With over 15 years in the turbo remanufacturing sector, our team has seen how a poorly sourced turbo can derail a high-performance Audi’s performance. We don’t just sell parts—we provide the confidence that comes from knowing every unit has been tested to meet the demands of engines like the 4.0 TFSI.— autoKUR team

Related categories

Browse our other ranges:

• 4.0 TFSI 450 hp
• Fuel injector
• High-pressure pump
• Gasket kit
• Core deposit
• Search by part reference

Useful references

For regulatory and sector references, see Reglement (UE) 461/2010 — pieces de rechange et garantie constructeur.