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ENGINEERING THE FUTURE OF PERFORMANCE ™
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McLaren

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

    W.3 Turbo Upgrade, M838T

  • Advertised gains are estimates of HP and Torque “at the engine” calculated from gains as measured on a Dynojet Dynamometer in ideal conditions and typically show the largest possible change.  Actual gains are dependent on the following: Learn More

    Model – Manufacturers use the same engine in multiple model vehicles and often times they are in a different state of tune, for example: 2008 C63 and a 2008 CLK Black Series.  Both have the same engine, but the C63 has 451hp while the CLK63 has 500hp.  Naturally the C63 will show more gains as it starts at a lower level.

    Model Year – Similar to above, as time progresses, Manufacturers tend to slightly increase power output via software from one year to the next or offer “Performance Packages” with increased power.  The engines remain largely unaltered and as a result, final tuned output remains the same, while the gains are lower as the starting point is now higher.

    Fuel – Fuel quality is HIGHLY important with performance vehicles.  Low quality and/or low octane fuel will greatly impact engine output and potentially even engine health.  Top tier brand premium fuels should always be used to achieve the best results possible.

    Drivetrain – All wheel drive has higher drivetrain losses than rear wheel drive.  This results in lower numbers when testing on a chassis dyno.  Wheel/tire size and weight will also impact chassis dyno results

    Weather/Conditions – Temperature, humidity, altitude, and air density all impact engine performance.  Heat, high humidity, and thin air will all work towards reducing engine output

    Engine Health – Higher miles tends to result in increased build up and lower compression which can and will impact engine output.  Properly maintained engines will have better performance than abused or neglected engines.

    Supporting modifications – The highest power levels require supporting modifications.  Depending on the engine, this could mean forged internals, built transmission, upgraded fuel system, 110+ octane race fuel, etc.

  • $4,999.99

  • Prop 65 warning
    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 www.P65Warnings.ca.gov.

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
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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
Please contact tuning@weistec.com to see if a tune is available for these turbos on your specific application. Core exchange required.


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

  • Core exchange/charge required