Dinan + Performance Engine Software - MINI B46C Engine



Part # D900-B46-TCMG1-M-S1-W Be the first to write a review

Dinan + Performance Engine Software - MINI B46C Engine



This part is legal under the provisions of EPA’s Tampering Policy dated November 23rd, 2020.

See Emissions Details
3rd Generation MINI's have been largely unchanged since their introduction in 2015. However, the engines and ECU's have gradually been tweaked over multiple LCI refreshes. The first of which in 2020 saw the base B46 engine become standard between both the S and JCW Cooper models, albeit with minor changes. In addition, changes in architecture to the core ECU made early flash tuning solutions incompatible with the LCI. Even within the LCI itself there have been encryption changes that have further diminished flashing availability and relegating options largely to in-line tuners (piggybacks). That changes now. The 2020 B46C engine found in the S variants are the first LCI's to be imbued with Dinan levels of power. With no other modifications but the Dinan + engine tune and 91 octane, maximum gains of +57 WHP and +72 lb-ft of torque are attainable while still retaining a factory mathching 4yr/50k new car warranty. That's a fair amount of power, and fun, added to an already deceptively enjoyable vehicle. The little MINI that could, now can... and then some free of worry. While increases in power at this scale typically come at a cost to the engine's durability, this is typically due to improper calibrations that are simply after one goal regardless of engine health - maximum power. Dinan's calibrations are safe and reliable without sacrificing long-term reliability or performance. Dinan performance engine software is so much more than just turning up the turbo boost after all. It is a fully re-tuned engine management program that maximizes power while keeping all the MINI factory safeguards in place. In most cases Dinan software engineers also implement their own additional safety precautions in order to guarantee flawless performance that may not have been needed with factory power levels/programming. Protecting your MINI, while giving the most performance, is the definition of "Performance Without Sacrifice". To do just that, drivetrain and engine components are analyzed for strength, and then the calibration is tested on the dyno and in the real world for durability and drivability. This process has been a cornerstone of Dinan software development for decades and a major reason why Dinan performance tunes are often labelled as being the smoothest, factory-like solution in the marketplace.


  • More Power: Max gains of 57 WHP / 72 lb-ft of torque over stock with 91 octane. Consult the performance charts for additional data.
  • Dinan + performance software matches the factory new car warranty (4year / 50,000 mi) and is the warranty protection commonly associated with the Dinan brand.
  • No required parts. Install on a stock car and receive the full power gains.
  • Full map rescaling for drivability from idle to wide open throttle and everywhere in between.
  • Optimized boost control, cam phasing, fueling, airflow and temperature controls for maximum power output that is also safe and reliable.
  • Top speed governor (VMAX) removed.
  • Aggressive sport mode cooling added for optimum track effectiveness.
  • Pedal mapping optimized for revised torque output with a more linear throttle feel.
  • Retains all MINI factory engine safeguards and adds additional safety protections such as the stationary rev limiter and implementation of per gear torque limits.
  • Sport gauges rescaled to reflect higher than stock power output.
  • Stock JCW pops and bangs implemented for increased aural satisfaction over the factory S settings.
Brand Dinan
Dinan Point Value3
Emission Code7
Factory Rated HP189 (212 Measured)
Factory Rated Torque (lb-ft)206 (227 Measured)
Install MethodDealer
Labor Time (Hours)0.5
Max HP Gain64 @ 5000 RPM
Max Torque (lb-ft) Gain73 @ 2500 RPM
Peak HP267 @ 6000 RPM
Peak HP Gain54 @ 6000 RPM
Peak Torque (lb-ft)295 @ 4000 RPM
Peak Torque (lb-ft) Gain66 @ 3500 RPM
Product TypeEngine Software
StageDinan +
WarrantyDinan Factory Matching (4yr/50k) Warranty
Part NumberD900-B46-TCMG1-M-S1-W

This part is legal under the provisions of EPA’s Tampering Policy dated November 23rd, 2020. The company has reasonable basis (test results) to verify that this product allows the vehicle to operate within legal emissions standards and is therefore legal to be sold for on-street use in all states that accept the legal provisions of the Clean Air Act and the EPA Tampering Policy. This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending with CARB. Once testing is complete with California, and an E.O. number is issued, this product will be updated to 50-state legal status.
ECU Order Form
Select MINI under vehicle type.
Compatability limited to the 2020 MY (B46C LCI). 2021+ MY and 2020 MY B46D (JCW) owners please see note at the bottom of the page. See DME unlock and compatibility notices at the bottom of the product page for information on potential installation/compatibility limitations.
Dinan Factory Matching (4yr/50k) Warranty: See Details

Dinan + Performance Charts

EngineSelect Graph Type

Calibration Quick Reference

All info supplied in the table below is 'at the crank' for consistency when comparing data with MINI advertised numbers which are always reported at the crank. For data 'at the wheels' please refer to the appropriate chart from the dropdowns above.

Table also represents all possible ECU software options currently available for the selected platform. Some stages / variants may require additional hard parts to achieve advertised numbers. Please consult the appropriate stages product page for details.

B46C (S)
Stock as Reported by MINI 189 HP 206 LB-FT
Stock as Measured by Dinan 212 HP 227 LB-FT
DINAN + / 4YR/50K / $899.95
Dinan + (91 Octane) 267 HP 295 LB-FT +64 HP +73 LB-FT
STAGE 1 / LIMITED / $499.95
91 Octane 267 HP 295 LB-FT +64 HP +73 LB-FT
93 Octane 295 HP 306 LB-FT +87 HP +85 LB-FT
100 Octane 316 HP 322 LB-FT +108 HP +103 LB-FT
104 Octane333 HP 335 LB-FT +123 HP +117 LB-FT
E85358 HP339 LB-FT+140 HP+134 LB-FT


MINI B46C DME's must be unlocked and bench flashed by Dinan. While dealer / retail unlock and flashing tools are in development and will be available in the future, at present, two options are available:

OPTION 1: Visit a Dinan Dealer and purchase the Dinan Flash Software . They will remove and mail the DME to Dinan. We'll unlock the DME, flash the software and ship it back. They'll reinstall the DME.

OPTION 2: Purchase the tune. Send us your DME. We’ll unlock it, install Dinan software, and ship it back. The unlock process is free. Ground shipping to the continental USA is free. Follow the steps below if this is the course you wish to pursue.

  1. Purchase the tune by contacting Dinan via phone at 1-800-341-5480.
  2. Fill out the unlock form and select BMW under the unlock type.
  3. Mail your DME to Dinan, 4800 U.S. Hwy 280 W, Opelika, AL 36801, USA, and include the last 7 of your VIN on the outside of the box along with a copy of the unlock form inside the box.

At no time during the unlocking process is the DME opened or physically modified. If the DME is flashed back to stock, it will need to be unlocked again. Also, vehicle manufacturers issue many DME part numbers and revisions throughout their vehicle lineup. As such, some DMEs may be temporarily unavailable as new parts and/or revisions are released.

CODE CLEARING: Customers doing the DME removal/install process themselves should be aware that in the case a fault code occurs, having the ability to read and erase fault codes is crucial. Failure to be able to perform this task may result in a vehicle that is inoperable. Dinan will not cover any expenses related to not being able to clear codes (towing, equipment rental, etc.).


BOX CODES: The MINI B46C engine and its multitude of variants account for numerous unique box codes across various platforms. While Dinan has created files for many of these permutations, there is a chance you may have a box code that we have not seen. If this happens to be the case we will need to create a file for your vehicle. This process could add up to 7 days to the bench flash process although in most cases it will be turned around within 2 business days.

2021+ B46C / 2020+ B46D LCI's: Current compatibility of the MINI LCI engine software is limited to the B46C engine in MY 2020 vehicles. MY 2021+ vehicles utilize different factory encryption that continues to be worked on. 2020 B46D powered MINI's (JCW) are needed for development in order to expand coverage to them. If you own one and are interested in helping Dinan develop the B46D flash with your vehicle, please reach out to [email protected]. Please note it would require the vehicle and/or the DME to be sent to Dinan in Opelika, Alabama.


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    Some parts are not legal for use in California or other states with similar regulations.