BMS N54 JB4 (G5), 2007-2010 BMW 135i / 335i / 535i (N54)
The BMS JB4 is the most popular tune for the BMW 135i and 335i N54 vehicles.
NEW! JB4 PNP (N54 Stage 3) BMW Performance Tuner
Exclusively for the 2007-2010 BMW 335, 335xi, 135i, 535i, 535xi, Z4, X6, and 2011+ 335is, 1M, and Z4 N54 Twin Turbo.
ADD 100 Horsepower to your Twin Turbo BMW Instantly!
Ready to take your BMW twin turbo to the next level?
How about up to 80hp to the wheels (100hp crank) on a completely stock car or up to 180hp to the wheels (215hp crank) on a fully modified car? The JB4 features a simple plug and play installation harness and built in deletion of hidden "tuner detection" codes. Compatible with all ECU versions. With over 5000 in use and tens of millions of customer miles driven the JB Stage3 has proven time and time again to be the safest and easiest way to extract the true potential from your N54 twin turbo!
Now shipping with JB4 featuring 5x the processing power, 2x the memory, more robust signal conditioning, and integrated CANbus. Our new CANbus module allows the JB4 to communicate with your vehicle like never before. New features include code reading/deleting, optional in dash boost, timing, air/fuel, shift light, and IAT gauges, autotuning, a buttery smooth new CANbus based integrated boost control system, map switching on the fly via steering wheel controls, built in downpipe fix, hot/cold oil temperature protection, progressive methanol integration, water pump remapping, gear dependent boost control/traction assist, and much more to come with free firmware updates uploaded using a windows laptop (or mac w/ windows emulator) and BMS USB cable.
In addition to our performance mapping the JB4 features several "on the fly" user selectable maps including a 100% stock bypass map, a 4500rpm rev limited valet mode, a fuel economy map, a progressive methanol map, a race gas map, and for those interested an rpm by rpm user adjustable map. And unlike other flash and piggyback tunes that charge per the map and lock to your VIN the JB4 is 100% unlocked. Meaning you get access to every new feature we release free of charge and when your lease is up will be able to resell the JB4 without penalty.
Remember the JB4 does not require any additional modifications or previous stages. Simply install the JB4 as your first and only modification and enjoy an entirely new fast and smooth driving experience. The JB4 also does not require any user setup or customization. Those features are included for more advanced users but for the average enthusiast simply install and enjoy!
JB4 Dyno results
Stock, Stage 3 on a completely stock automatic 135i
(MSD81 ECU) with 91 octane
Baseline, Stage 3 on an automatic 335i with high flow downpipes and BMS intake, on 93 octane
Various JB4 dynos from a 2008 135i with BMS DCI, high flow downpipes and intercooler
NEW G5 Board Available:
1) A revised boost control system allowing both isolated or integrated control with no hardware PWM/duty cycle limits, etc. PWM limiting is all software/firmware based.
2) Built in crank position offset (CPS) and speed limit defeat (SLD) through additional wires that can be connected to the DB9 connector w/ the BMS USB cable.
3) An extra high current output that can be used to power a 2STEP relay, nitrous relay, etc.
4) 1.8k O2 biasing resistors instead of 2.7k biasing resistors allowing a wider range of AFR adjustment.
5) Some additional analog and digital I/O for future expansion.
The G5 board is meant for "Full Bolt On" cars or those with upgraded turbos. Regular tune only or very lightly modded cars will not see any advantage with the G5 versus the G4.
• 2006-2010 E90 Sedan 335i / 335xi
• 2006-2010 E91 Touring 335i / 335xi
• 2006-2010 E92 Coupe 335i / 335xi
• 2007-2010 E93 Convertible 335i / 335xi
• 2008-2010 E60 Sedan 535i / 535 xi
• 2008-2010 E61 Touring 535i / 535 xi
• 2008-2010 E82 Coupe 135i
• 2011+ 335is
• 2008-2010 E88 Convertible 135i
• 2008-2010 BMW X6 xDrive35i
• 2009+ BMW Z4 sDrive35i
• 2011+ 1M
• Fully compatible with DCT transmissions!