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MP4 12C ECU Tune
Purchase MP4 12C ECU Tune
  • SKU: 05-838-00081-3

    MP4 12C ECU Tune

  • 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 about Crank HP Vs Wheel HP

    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.

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  • $2,999.00 $2,999.00

  • 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 730
Weistec Torque 652
Manufacturer Weistec
Street legal in all the US States No
Engine Family M838T
Stock Horsepower 625
See more
year make model trim engine
2014 McLaren MP4-12C Spider Twin Turbo 3.8L V8 (M838T)
2014 McLaren MP4-12C Base Twin Turbo 3.8L V8 (M838T)
2013 McLaren MP4-12C Spider Twin Turbo 3.8L V8 (M838T)
2013 McLaren MP4-12C Base Twin Turbo 3.8L V8 (M838T)
2012 McLaren MP4-12C Base Twin Turbo 3.8L V8 (M838T)

Product Description

ECU Calibration Process: How do I get my ECU Calibrated?

The factory Mclaren MP4-12C is an extraordinarily accomplished track car for the road. Having all the attributes that make a daily driven vehicle usable makes you think it's a watered down track car. But when you plant your right foot down on the accelerator, an unexpected urgency rushes you forward like no other road car. No drama, just pure acceleration. Having this unparalleled performance lurking beneath the sensual body lines is beyond intoxicating. However, there is always room for more.

"The car is already fast enough". As true as that may be, we cater to the clientele that thinks otherwise. Truly experience the capabilities of your MP4-12C today with our ECU Calibration.

Weistec MP4-12C ECU Power

What does all this mean to you?  More power, sharper throttle response, and a complete focus on the driver makes this the perfect addition to your McLaren for a much more enjoyable experience for you. 

*Power gains vary based on model, modifications, fuel, and running conditions.

ECU Calibration Process: How do I get my ECU Calibrated?

Key Features:

  • Improved Throttle Response

  • Optimized Fuel, Spark, and Boost

  • +90 Wheel Horse Power

  • +110 Wheel Torque