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M-Engineering ECU Tune McLaren M840T

Price
$5,495.00
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

FAQ

Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested.

International Shipping
Any and all customs duties, taxes, import fees, and/or tariffs assessed in connection with the purchase shall be the sole responsibility of the customer/end user.

Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unused and in its original packaging. All returns are subject to a restocking fee based on item and package condition. Buyer is responsible for paying for return shipping costs. If you need a return label, we will email you a return label and deduct cost from refund. Original shipping costs are not refundable. Special order items are not eligible for return.

Cancellation Policy
In order to cancel your order you must email within 24 hours of placing your order or before your order has shipped, whichever occurs first. Special order items are not eligible for cancelation.

Exchange Policy
We have a 30-day exchange policy, which means you have 30 days after receiving your item to request an exchange. To be eligible for an exchange, your item must be brand new in box. Buyer is responsible for paying all shipping costs to exchange product.

Product Description

Unlock the hidden performance of your McLaren’s M840T twin-turbo V8 with this professional OBD2 ECU tune by M-Engineering, available through Soul Performance Products. This upgrade lets you safely increase power delivery, improve throttle response, and tailor engine behavior without removing the ECU — all through the OBD2 port. With multiple calibration maps for different octane levels and on-the-fly map switching, you can optimize your Artura, 720S, 765LT, or Senna for street or track use. The tune also adds useful features such as datalogging, live data viewing, fault clearing, and the ability to revert to stock settings whenever you want.

Fitment Notes

  • Compatible with McLaren models equipped with the M840T 4.0 L twin-turbo V8 — including 720S, 765LT, Senna, and other supported variants.

  • Requires a one-time ECU bench unlock process (shipping the ECU to the tuner) before OBD2 flashing is enabled.

  • Suitable for street and track tuning, with map options tailored to different fuel octanes (91, 93, and 100+).

Included

  • M-Tuner OBD2 flashing interface / dongle for McLaren.

  • USB cable for connecting to a laptop or PC.

  • Pre-loaded M-Engineering performance calibrations optimized for the M840T engine.

  • On-the-fly live map switching capability & datalogging software support.

Product Specs

  • Tuning Method: OBD2 ECU flash — no ECU removal required after bench unlock.

  • Calibration Stages: Multi-map support for Stage 1 & Stage 2 configurations with built-in octane-specific maps (e.g., 91, 93, 100+).

  • Features: Live map switching, fault reading/clearing, datalogging, live data access, Dyno Mode toggle, auto start/stop disable, left-foot braking mode, kickdown disable, and more.

  • Flashing Utility: M-Tuner suite developed for at-home or dealer flashing.

Product Features

  • Power & Response Gains: Calibrations designed to increase horsepower and torque while enhancing throttle response and overall engine driveability.

  • On-the-Fly Map Switching: Multiple pre-loaded maps let you switch between fuel-specific and performance modes without reflashing each time.

  • Diagnostic & Live Data Tools: Built-in software support lets you read/clear fault codes and monitor live engine data — handy for tuning validation and troubleshooting.

  • Reversible & Safe: Keep your stock calibration saved and revert to factory settings whenever needed.

  • Tailored for Aftermarket Upgrades: Better integrates with other performance mods such as intake, downpipes, or exhaust systems, maximizing combined gains.