TTE850 Turbo Upgrade, B9 S4/S5/SQ5 EA839 3.0T

Now Available for Pre-Order! Orders will begin shipping February 2026 in limited numbers. Reserve your spot today!

We at GAS are proud to have been given the opportunity to perform beta testing on the new TTE850, and have already extracted over 730hp/745tq (the safe limit of the stock EA839 engine) on an E40 blend, over double the factory power! These numbers were achieved at very low wastegate duty cycles, meaning this new turbo can achieve power numbers that far surpass the stock engine limits. Over 800ft-lbs of torque was achieved back-to-back during early revisions, which was reduced to not stress the engine.

With upgraded head studs, auxiliary fuel systems, and forged pistons this turbo is capable of achieving huge power levels!

The TTE850 EA839 3.0 is the newest evolution evolved from the famous TTE810+ and brings a more power and better longevity through lower exhaust backpressure and lower exhaust gas temperatures. The turbine housing features our TTE high end thermoisolation which is superior to the OEM one.

Featuring a larger framed plug & play turbo with 66mm compressor and 63mm turbine so giving big power and yet keeping great response for its HP potential.

Features:

• Bigger compressor cover versus the OEM: Maximum efficiency for lower intake temperatures (IAT) for maximum power.
• Bigger twin scroll turbine housing versus the OEM: Lower exhaust gas tempartures (EGT) and lower backpressure for maximum engine power.
• Turbine housing with TTE superior thermoisolation: Keeping the ambient temperatures in the engine compartment in check.
• Billet Milled 7+7 Blade Compressor (66mm Inlet): Enhanced air intake for improved performance and efficiency.
• 9 Blade high flow low inertia Turbine (63mm Outlet): Maximizes exhaust flow and increases power output.
• TTE Upgrade Bearing Pack: Upgraded bearings for superior durability and longevity.
• Genuine BWTS Actuator: Ensures precise boost control and consistent power delivery.
• CNC Optimized Compressor Cover: Precision machining for perfect fit and improved airflow.
• Plug and Play Installation: Direct fitment with no modifications required for seamless installation. (Except the intake on the turbocharger needs an inlet adapter, review also the point warning and safety notes)
• Works with all TTE810 / TTE810+ turbo intakes and adapters
• Power Potential: 800bhp+
• Balanced for Peak Performance: Individually balanced single components then core assembled and high-speed VSR balanced for long-lasting reliability
• Included Balance Test Report: Documented proof of balance for added confidence in performance.
• Software Recalibration Required: Maximize performance with necessary ECU tuning.
• Proven TTE Quality: Trusted craftsmanship and engineering excellence from TheTurboEngineers.
• 1-Year TTE Warranty: Comes with a one-year, trouble-free warranty for peace of mind.
• Made in Germany: Manufactured with precision and quality in Germany.