TTE390 Upgrade Performance Turbocharger VAG 1.8T 20V (2.0tfsi hybrid)


Site Sponsor
Site Sponsor
Jul 9, 2014
Reaction score
TTE390 Upgrade Turbocharger VAG 1.8T

Introducing our third K04-064 turbocharger stage for the 1.8T platform.

TTE390 for the 1.8T begins as a brand new standard BorgWarner K04-064 turbocharger taken from the 2.0tfsi platform, we dismantle and then set about upgrading and optimizing as engineers to create the ultimate K04 TFSI hybrid for the 1.8T VAG platform. This turbo shares same spec as our highly acclaimed TTE420 for the 2.0TFSI, proven at over 440ps without wmi. No spacer plate is required for fitment.

Engineered & Enhanced

The formula to making a TTE390 starts with a much larger 2871X TTE billet compressor wheel, chosen because is highly efficient, new generation type with ultra thin blades. The Re-Profiled compressor cover is machined to a optimized tolerance to ensure maximum compressor efficiency is given. Also the intake pipe is ported to give a smooth transition for the incoming air flow. We fit our TTE CNC silencer delete, we modify the turbo discharge silencer, removing the baffle internals and fitting a new straight through section, removing any restriction and its function as a noise cancelling device, and so improving the flow, giving less surge and enhancing the sound.

A key part to driving the large 2871X compressor and in turn making this unit produce the huge power advantage over stock and also the competition, is machining and fitting a far larger BorgWarner K16 curved clipped turbine and shaft, while still keeping the k04 core, this is not so easy to do. This K16 turbine gives much lower back pressure and keeps EGT lower compared to stock K04 turbine or clipped stock types other company's are still using.

The clipping of the K16 turbine is a special TTE grinding process to the turbine blade tips, curved to alleviate stress from process. Clipping reduces blade area thus increasing gas flow and so reducing back pressure and lowering exhaust gas temperatures, allowing safer higher boost level's. This process also gives a secondary advantage of removing some material, lightening the turbine thus reducing rotational mass improving moment of inertia. Dyno's have shown near no loss in response vs stock K04 yet huge gains in power and torque.

Special TTE developed in house 360 deg high performance motorsport journal bearing system is fitted. Durable at high loads with no loss in transient response.

Actuator used is uprated sprung OE unit, fitted with our reinforced clamps for trouble free operation. This also can also be modified to customer needs and specifications.


Precisely balancing our turbochargers is a key critical factor to become a TTE upgrade unit as longevity and performance are paramount. Good balance improves acoustics also. Subsequent great care is taken with all TTE turbochargers to achieving our balance standards. Firstly parts are balanced at slow speeds up to 2800RPM in multiple planes using our single parts machine, then components are assembled and then the CHRA are dynamically balanced, but this time depending on application at up to 250,000 RPM in multiple planes using our in house VSR machine to acquire the ultimate equilibrium, to a standard far higher than OEM. Each turbocharger is supplied with serial numbered balance test result document.

Key Points
  • Genuine BorgWarner Housings, Exhaust Manifold & Components
  • TTE2871X Highly Efficient Billet Next Gen Compressor Geometry
  • Optimized Compressor Cover Machining Clearances
  • CNC Machined exhaust manifold for 1.8T fitment
  • CNC Adaption hardware for exhaust manifold 1.8T fitment
  • CNC Optimised modified silencer discharge delete
  • Port Matched Exhaust Runners (option available at extra cost. please ask for info)
  • Ported Intake Pipe
  • Genuine BorgWarner Special Curved Clipped K16 Turbine
  • Uprated & Reinforced Genuine Actuator
  • Genuine Original Pierburg N75 Valve
  • Special TTE K16/K04 Reinforced Bearing System
  • Dynamically Balanced & Comes With Protocal Test Report
  • 400PS+ Capable
  • Designed, Machined & Built by TTE in Germany
This turbo is far from Plug&Play fitment. Fabrication skill and adaption or custom parts is required.


Reconditioning price shown is based on overhauling and reconditioning, upgrading a undamaged used turbocharger within specification. Only once cleaned and dismantled, inspected then a firm price be made.

Comparison between BorgWarner K16 (TTE390 uses clipped K16) vs BorgWarner K04 (s3 2.0tfsi)
I've updated the Spec on TTE390 (Same as TTE420 2.0TFSI) as we have made a compressor wheel change and moved to TTE 2871X billet wheel.

Advantages :

More inducer area
Faster Spool
Higher flow

Comparson of TTE390/TTE420 Vs Stock 2.0 TFSI 2283 as used on S3
Last edited:

98 OCTANE FUEL (NO WMI) 396.84PS 484.5Nm
Hi! Im a little confused here. The image shows a complete turbo with manifold and a electronic boost controller. I has a Leon Cupra R LHD 2004. Does this can fit my car? does not have problems with touching the gearbox? If it does. Whats the best matching turbo to my application? with the less lag possible? I dont want high hp numbers
I think telling si your current spec may help you further ric.
The turbo here is an all in one oem turbo from the newer tfsi cars. And requires a custom downpipe.
If you have some hardware already for the Lcr a k04 hybrid may be a better route.
  • Like
Reactions: TTE Si
I think if not wanting the higher numbers and wanting to keep lag a minimum TTE300 is great option with correct hardware and good software 330ps is a achievable with near stock reponse.

This turbo frame is as Daz says from the tfsi gen of VAG range so requires much custom fab work to install, but does offer good power with good response.

Relatively low boost levels for 391ps 481nm 98 fuel with WMI but not mapped for.

Last edited:
  • Like
Reactions: creechy
VW Polo GTI 1.8T TTE390 (no wmi)

4000-6500 RPM 1,7 Bar
6500-7500 RPM 1,4 Bar

Says TTE420 but TTE390 is the same


Relatively low boost levels for 391ps 481nm 98 fuel with WMI but not mapped for.

  • Like
Reactions: andrew_wright and creechy
S3 1.8T BAM 8.5:1 CR from T Performance
TTE390 turbo
102 FUEL
1.4BAR (no overboost)
TIJPOWER custom software

384ps 478nm