Dinan Stage 1 Performance Engine Software - BMW 'F' Chassis N55 Engine (Non-M2 / X4 M40i)

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Part # D900-N55-S1 Be the first to write a review

Dinan Stage 1 Performance Engine Software - BMW 'F' Chassis N55 Engine (Non-M2 / X4 M40i)



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

See Emissions Details
Dinan has a long and storied past when it comes to engine tuning having introduced our first engine performance chip in the mid 80's - over 3 decades ago. From those early years with chips, followed by engine software and then to our own external control modules we have become experts in nearly every possible way to extract safe, reliable power from the factory powerplant. While we have long preferred the unheard of control and sophistication capable of being achieved from engine software, over the past 6 years that option was not one afforded to us. That changes now with the re-introduction to flash tuning for Dinan with the S55, and now, N55 engines. The start of the next generation of Dinan flash tunes, the N55 calibrations are held to the same principles of the past; performance, reliability, and safety. 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. Protecting your BMW while giving the most performance is the definition of "Performance Without Sacrifice". Drivetrain and engine components are analyzed for strength then the calibration is tested on the dyno and in the real world for durability and drivability. This generation of Dinan flash tunes does differ from the past however in that there are multiple octanes to choose from depending on your needs, desires or limitations. Whether you need a tune for 91 pump gas living in California or want to experience maximum performance on 104 octane race gas at the track or something in between, chances are Dinan has an option for you. The Dinan Stage 1 Performance engine software is designed for the N55 engine to yield maximum power (for a variety of different octanes), improve drivability, and remove the factory speed governor for unadulterated entertainment.


  • More Power: Max gains up to 95 WHP / 120 lb-ft of torque on the base N55 using 104 octane. Consult the performance charts for detailed data and additional octanes.
  • Dinan Stage 1 performance software includes a limited lifetime warranty against defects in the software and provides free updates and reflashes as they become available. Labor or shipping charges are not included in the warranty and are at the discretion.
  • Access to numerous octane calibrations depending on your needs (91, 93 and 104). Switching between mappings would require a reflash at a Dinan authorized dealer.
  • The Dinan Dual Core Intercooler is recommended for improved performance gains, regardless of octane, across the entire power band (where applicable).
  • Full map rescaling for drivability from idle to wide open throttle and everywhere in between.
  • Top speed governor removed.
  • Sport Cooling mode in sport / manual modes.
  • Upgradeable from DINANTRONICS - See the FAQ linked below for details.
  • Retains all BMW factory engine damage safeguards and adds additional safety protections.
  • Torque gains drastically improve acceleration.
  • Downloads through the OBD2 Port - See compatability notice at the bottom of the product page.
  • Hassle free operation — Install and enjoy.
Brand Dinan
Dinan Point Value3
Emission Code7
Factory Rated HP300 (318 Measured)
Factory Rated Torque (lb-ft)300 (303 Measured)
Install MethodDealer
Labor Time (Hours)0.5
Max HP Gain105 @ 4500 RPM (104 Octane)
Max Torque (lb-ft) Gain130 @ 4000 RPM (104 Octane)
Peak HP395 @ 5500 RPM (104 Octane)
Peak HP Gain73 @ 6500 RPM (104 Octane)
Peak Torque (lb-ft)430 @ 3500 RPM (104 Octane)
Peak Torque (lb-ft) Gain128 @ 3500 RPM (104 Octane)
Product TypeEngine Software
WarrantyLimited Lifetime Warranty
Part NumberD900-N55-S1

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.
See compatibility / box code notice within the product description for information on potential installation limitations. Neither the N55 based M2 or X4 M40i nor N55 engines equipped with a pneumatic wastegate are supported with this version of software. D900-N55-S1 is specific to N55's with an electronic wastegate.
Limited Lifetime Warranty: See Details


The N55 engine and its multitude of variants account for several 100 unique box codes across various platforms. While Dinan has created files for a great number 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 take several days and multiple dealer visits. 

Dinan Stage 1 Performance Charts

Platform & 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 BMW 300 HP 300 LB-FT
Stock as Measured by Dinan 318 HP 303 LB-FT
STAGE 1 / LIMITED / $499.95
91 Octane 345 HP 379 LB-FT +66 HP +81 LB-FT
93 Octane 384 HP 414 LB-FT +92 HP +115 LB-FT
104 Octane 395 HP 430 LB-FT +105 HP +130 LB-FT
STAGE 2 / LIMITED / $549.95
91 Octane 426 HP 457 LB-FT +119 HP +152 LB-FT
93 Octane 436 HP 472 LB-FT +135 HP +172 LB-FT
100 Octane468 HP502 LB-FT+168 HP+205 LB-FT
104 Octane 481 HP 520 LB-FT +187 HP +222 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.

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