Ready to take your twin turbo BMW to the next level?
How about up to 80hp to the wheels (100hp crank) on a completely stock car, up to 160hp to the wheels on factory turbos, or up to 350hp to the wheels on a fully modified car with larger turbo(s)? The JB4 includes a simple plug and play installation harness and is compatible with all ECU versions and transmission types. It's everything you need to take your N54 powered vehicle from mild to wild!
In addition to several performance maps which can be selected "on the fly" right from the drivers seat the JB4 includes a 100% stock bypass map, a valet mode, ethanol fuel (E85) support, progressive water/methanol injection support, racing fuel map, an auto tuning map that adjusts the JB4 mapping to your current climate, octane, vehicle condition, and modifications continuously, and for those interested an rpm by rpm user adjustable map. Other features include optional in dash gauges for boost and other engine parameters, a programmable shift light, on the fly adjustable torque limiting to aid with launches at the track, an optional 2STEP rev limiter & no lift shifting for manual transmission cars, an optional speed delimiter, and much more.
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 racing experience. As you decide to modify your car further the JB4 is setup to grow with your vehicle. Whether you're racing a 100% OEM car on pump gas or a 700whp single turbo drag queen, the JB4 has the perfect mix of performance, features, flexibility, and support to ensure your car performs to the best of its potential!
- Power gains of up to 100hp and 100tq to the wheels on a stock vehicle
- Quick Plug & Play Installation
- CANbus integration offering unrivaled tuning features and performance
- Runs as smoothly as stock, this is how your N54 should have come from the factory
- Compatible with all driving modes
- Fuel economy unchanged during normal driving
- Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment
- Ethanol (E85) compatible tuning maps
- Able to read/delete fault codes
- Not VIN locked, can be removed without a trace and resold down the road
3) The JB4 has several safety systems built in that will force a switch to map 4 (low boost) if the JB4 notices various conditions. Including boost over target, fuel pressure below target, and air/fuel ratio running lean. If you ever encounter an automatic switch to map 4 review the FAQ below for addl information.
BMW 1 Series
- 2008-2010 E82 Coupe 135i
- 2008-2010 E88 Convertible 135i
- 2011 E82 1M
BMW 3 Series
- 2006-2010 E90 Sedan 335i/335ix
- 2006-2010 E91 Touring 335i/335ix
- 2006-2010 E92 Coupe 335i/335ix
- 2007-2010 E93 Convertible 335i/335ix
- 2011-2013 E92 335is
BMW 5 Series
- 2008-2010 E60 Sedan 535i/535ix
- 2008-2010 E61 Touring 535i/535ix
BMW X Series
- 2009-2010 BMW E71 X6 xDrive35i
BMW Z Series
- 2009-2016 BMW Z4 sDrive35i/is
Fully compatible with DCT transmissions.
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.
JB4 Dyno results
Stock, JB4 on a completely stock automatic 135i, on 91 octane
JB4 on an automatic 335i with Exhaust and BMS intake, on 93 octane
JB4, Exhaust, BMS intake, BMS Flash, on 50% E85 fuel
JB4, RB Hybrid Turbo Upgrade, Exhaust, BMS intake, BMS Flash, BMS Methanol Injection, Larger Intercooler, on 50% E85 fuel
5 Year BMS Repair Warranty
JB4 Optional Phone Software
JB4 Plug and Play Video Install Guide
JB4 135i 335i Steering Wheel Controls Demo Video
JB4 Optional In Dash Boost Gauge / Shift Light Demo
JB4 Optional Startup Gauge Sweep