BMS BMW N20 N26 N55 S55 Type B JB1 Stage 1 Tuner (M2 Competition, M135i, M235i, 335i, 435i, M3 & M4)

BMS BMW N20 N26 N55 S55 Type B JB1 Stage 1 Tuner (M2 Competition, M135i, M235i, 335i, 435i, M3 & M4)

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This plug and play tuner attaches to two easy to access sensors in the engine bay and works with your factory DME tuning to remap your boost, timing, and fuelling for optimal performance and reduced turbo lag. It features a 64mhz processor allowing sensors to be sampled 800 times per second using dedicated 10 bit digital to analog converters, ensuring smooth and powerful performance. The same box automatically detects whether you have an N20, N55, or S55 motor based on the TMAP sensor voltage and adjusts the tuning accordingly.

Power gains on the N20 motor are up to 45 horsepower and 60 torque (35hp and 50tq at the wheels), on the N55 motor are up to 50 horsepower and 65 torque (40hp and 55tq to the wheels), and on the S55 motor up to 60 horsepower and 75 torque (50hp and 60tq to the wheels).

Installation is very discrete and it quickly removes without a trace when needed. Fuel economy during normal driving is unchanged. Compatible with all driving modes.

Please Note: This Stage 1 Tuner is for use on Type B TMAP sensors, model year 2014 and newer. Please check your TMAP sensor type before ordering. You may refer to the image below.

BMS BMW N20 N26 N55 S55 Type B JB1 Stage 1 Tuner (M2 Competition, M135i, M235i, 335i, 435i, M3 & M4) - Nforcd UK


For the Stage 1 Tuner with the Type A TMAP sensor harness (2011-2012), you will need the BMS BMW N20 N26 N55 S55 Type A JB1 Stage 1 Tuner (Inc. 135i, 335i & 535i).



N55 Stage 1 Applications:

BMW 1 Series
2014+ N55 BMW F20 F21 M135i

BMW 2 Series
• 2014+ N55 BMW F22/F23 M235i

BMW 3 Series
• 2014+ N55 BMW E90 E91 E92 E93 335i/xi
• 2014+ N55 BMW F30 F31 335i/xi
• 2014+ N55 BMW F34 335i xDrive GT

BMW 4 Series
• 2014+ F32 F33 F36 Coupe 435i / 435xi

BMW 5 Series
• 2014+ F07 535i GT
• 2014+ F10 F11 535i / 535xi

BMW 6 Series
• 2014+ F13 640 Coupe
• 2014+ F12 640 Convertible
• 2014+ F06 640 Gran Coupe

BMW X Series
• 2014+ X1 N55 TwinPower
• 2011+ X3 X5 X6 N55 TwinPower
• 2017+ BMW X4 M40i

BMW 2 Series:
• 2014+ N20/N26 F22 F23 220/228

BMW 3 Series:

• 2014+ N20/N26 F30 320/328

BMW 4 Series:
• 2014+ N20/N26 F32 F33 F36 420/428

BMW 5 Series:
• 2014-2016 N20/N26 F10 / F11 520/528

BMW X Series
• 2014+ X1 E84 N20
• 2014+ X3 F25 N20

BMW Z Series
• 2014-2016 Z4 N20




S55 Stage 1 Applications:

• 2018+ F87 M2 Competition

• 2014+ F80 M3

• 2014+ F82 M4


To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout. 


N55 Stage 1 Dyno Results



2014 M235 Comparing Dinan DTRONICS Stage1 and BMS Stage1


2012 328i N20 Stage 1 Dyno Result

N20 Stage 1 VBOX Tests
BMS BMW F Chassis N55 N20 N26 S55 Stage 1 BMW Tuner 328i VBOX Test


  • F30 Installation
  • N20 Installation
  • S55 Installation




Manufactured by

Burger Motorsports



5 Year BMS Repair Warranty