My Cart: 0 item(s)


Secure Checkout


W.3 Turbo Upgrade, M838T
Purchase W.3 Turbo Upgrade, M838T
  • SKU: 01-838-01836-8

    W.3 Turbo Upgrade, M838T

  • Gains are at the engine or "crank". Actual gains are dependent on the model, model year, fuel octane, engine health, and environmental conditions. Learn More

  • $4,999.99

  • Prop 65 warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Weistec Horsepower 786
Weistec Torque 663
Turbo Type W.3 (Factory Upgrade)
Manufacturer Weistec
Street legal in all the US States No
Engine Family M838T
See more
year make model trim engine
2020 McLaren 600LT Spider Twin Turbo 3.8L V8 (M838TE)
2019 McLaren 600LT Spider Twin Turbo 3.8L V8 (M838TE)
2020 McLaren 600LT Base Twin Turbo 3.8L V8 (M838TE)
2019 McLaren 600LT Base Twin Turbo 3.8L V8 (M838TE)
2018 McLaren 600LT Base Twin Turbo 3.8L V8 (M838TE)
2020 McLaren 570GT Base Twin Turbo 3.8L V8 (M838TE)
See more

The Weistec W.3 Turbo Upgrade for the McLaren 3.8L Twin turbo vehicles provides vastly improved top end performance of the M838T Engine.  Where the factory turbos peak out shortly after 6000 rpm causing power to drop as revs increase towards 8000 rpm, the Weistec W.3 Turbos hold power until the rev limiter.

The factory turbocharges are disassembled and fully inspected.  The compressor cover and center cartridge are then machined to accept our 5-axis CNC machined impeller wheel which despite being substantially larger, weighs the same as the factory cast impeller wheel.  Externally, no changes are made to maintain a completely stock appearance.  The new impeller wheel supports greater power levels than the factory unit with little to no sacrifice in spool and response thanks to its light weight construction.  The turbochargers are then reassembled with new seals and bearings, then fully balanced for smooth operation and OEM service life.  All the OEM oil and coolant lines bolt right up making for a simple install.

For maximum results, the combination of our Weistec Downpipes, and Weistec High Flow Air Filters is recommended.  A Weistec W.3 Turbo Specific ECU Upgrade is recommended.

Key Features:

  • Signifigant horsepower and torque gains depending on fuel and supporting modifications

  • 5 Axis CNC Machined

  • High RPM Balanced for perfect operation

  • Substantial power throughout the RPM range

  • Stock Appearance when installed

  • 100% Bolt on installation

  • All necessary hardware and gaskets are included

  • Core exchange/charge required