Dinan + Performance Engine Software - BMW B46 Engine



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

Dinan + Performance Engine Software - BMW B46 Engine



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

See Emissions Details
Engine software on a turbocharged platform is far and away the most cost-effective upgrade to improving engine performance. Through optimization of control strategies and taking full advantage of the engine's capabilities, substantial power can be extracted without any additional modifications. For F chassis BMW's equipped with the B46 motor this translates into maximum gains of nearly 55 WHP & 80 lb-ft of torque on pump gas with the capability of significantly more when running higher octane race fuels. With a 12-29% WHP bump and an increase of 16-45% of torque, depending on octane, the results are delightfully undeniable. While increases in power via ECU upgrades in the marketplace can 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 BMW 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 BMW, 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 labeled as being the smoothest, factory-like solution in the marketplace. Dinan's ECU upgrades are offered in numerous configurations depending on your specific needs, desires or limitations. Whether you are limited to 91 pump gas, want to experience maximum performance with 104 octane, or something in between, chances are Dinan has an option for you. At its core Dinan offers 2 base options; Stage 1 and Dinan +. The Dinan Stage 1 Performance Engine Software is designed for the B46 engine to yield maximum power (for a variety of different octanes), improve drivability, and remove the factory speed governor for unadulterated entertainment. The Dinan + variant of software offers these same features (albeit limited to 91/93 octane) but also carries the signature Dinan 4yr / 50k, factory matching new car warranty that the brand is synonymous with. NOTE: See DME unlock and compatibility notices at the bottom of the product page for information on additional potential installation/compatibility limitations.


  • More Power: Max gains of 39 WHP / 54 lb-ft of torque over stock on 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, lamda targeting, fueling, airflow and temperature controls for maximum power output that is also safe and reliable.
  • Retains all BMW factory engine safeguards and adds numerous additional safety protections.
  • Top speed governor (VMAX) removed.
  • Torque by gear strategies implemented for maximum power output and traction.
  • Sport mode cooling that targets lower coolant temperatures added for optimum track effectiveness.
  • Pedal feel improved to naturally align with the increased torque output.
  • Sport gauges rescaled to reflect higher than stock power output.
  • “der Schubblubbern” (AKA Thrust Bubbles or Pops & Bangs) added in Sport mode for additional audible satisfaction.
Brand Dinan
Dinan Point Value3
Emission Code7
Factory Rated HP248 (266 Measured)
Factory Rated Torque (lb-ft)258 (271 Measured)
Install MethodDealer
Labor Time (Hours)0.5
Max HP Gain43 @ 4000 RPM
Max Torque (lb-ft) Gain59 @ 3500 RPM
Peak HP303 @ 6500 RPM
Peak HP Gain26 @ 5500 RPM
Peak Torque (lb-ft)319 @ 3500 RPM
Peak Torque (lb-ft) Gain36 @ 2500 RPM
Product TypeEngine Software
StageDinan +
WarrantyDinan Factory Matching (4yr/50k) Warranty
Part NumberD900-B46-F-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 BMW MG1 under vehicle type
Dinan Factory Matching (4yr/50k) Warranty: See Details

Dinan + Performance Charts

Engine & OctaneSelect Graph Type

Calibration Quick Reference

All info supplied in the table below is 'at the crank' for consistency when comparing data with BMW 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.

Stock as Reported by BMW248 HP 266 LB-FT 
Stock as Measured by Dinan258 HP271 LB-FT
DINAN + / 4yr/50k / $899.95
Dinan + (91 Octane)303 HP319 LB-FT +43 HP+59 LB-FT
STAGE 1 / Limited / $499.95
91 Octane303 HP319 LB-FT+43 HP+59 LB-FT
93 Octane314 HP345 LB-FT+59 HP+82 LB-FT
100 Octane336 HP377 LB-FT+83 HP+117 LB-FT
104 Octane346 HP393 LB-FT+93 HP+132 LB-FT
Only use fuel equal to or higher than specified. Never use a lower octane fuel. Always follow our fuel guide, especially with race fuel and Ethanol, where available. Dynos are for reference only. Results will vary. Contributing factors include the vehicle condition, vehicle setup, dyno type, dyno setup, environmental factors, fuel quality, and more.


B46 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. Once unlocked the DME can be flashed through normal dealer tools. 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 B46 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.

ENGINE VARIANTS: D900-B46-F-S1 (-W) performance engine software is specifically tuned to function with the B46 engine in 'F' chassis vehicles. 'G' chassis B46 powered models are not supported by this release.


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