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2015+ M3/M4 S55 JB4
BMW JB4 M3 M4 BMW Performance tuner tune chip flash ecu raise boost
JB4 performance tuner F chassis M3
Ready to take your turbo //M vehicle to the next level?
The ultimate tune for your S55 powered vehicle, the JB4 allows you to go from factory stock to full race, and everywhere in between, with the push of a button on your steering wheel. The JB4 installs and removes easily and includes many unique features not found in any other tune including user adjustable 1st and 2nd gear boost limiting, map switching in dash, electronic wastegate control, ethanol fuel support, and built in advanced CANbus based diagnostic tools. Installation is completely removable with no splicing or cutting of factory wires.

For the latest performance results, updates, firmware, and map guide be sure to visit N54tech.com.
JB4 Map Guide
Map 0: Disable JB4 / Full Pass Through Mode
Map 1: Stage1 map adding approximately 40whp and 40wtq across the power band on pump gas. Suitable for all stages and fuel mixtures.
Map 2: Slightly more aggressive version of map 1 intended for vehicles with exhaust modifications and 93+ octane fuel. Can also be used with E85 and racing fuel mixtures.
Map 3: Slightly less aggressive version of map 1 intended for vehicles running on lower grade fuels such as 91 octane.
Map 4: OEM performance but with JB4 active for diagnostics only.
Map 5: //M low torque / linear throttle map.
Map 6: Custom tuning map.
Map 7: Race gas map. Requires 100 octane unleaded fuel and for the fuel mass connector to be installed. This map can also be used with up to 35% E85.
Map 8: Methanol injection map. Requires BMS FSB controller or methanol kit for progressive mapping and safety systems.
S55 2015 M3 Motor engine tuned JBM

M5 M3 tuning

Applications:

BMW M3
• 2015+ F80 M3

BMW M4
• 2015+ F82 M4

OBDII M4 M3 Tuner
 
M3/M4 S55 Dyno Results
S55 F80 M3 Dyno F82 M4 dyno stock vs tuned S55 BMW Jb4 Tuner stock BMW S55 M4 Pure turbo upgrade Jb4 tuned
ZCP map 2 vs stock dyno  
 
2015 M4 DCT, 100% stock except for JB4 and 5 gallons of E85 mixed with 91BMW M3 M4 Dyno Jb4 tuned
Change maps on the fly: JB4 S55 CAN Flap DEMO:
 
2015+ M3/M4 S55 JB4

$799.00
Not available in California. Worldwide Shipping Available.
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Optional BMS Data Cable for diagnostics and updates

$35.00
Worldwide Shipping Available.
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Optional JB4 Smart Phone Wireless REV3 for diagnostics and updates

$140.00
Worldwide Shipping Available.
Estimate Shipping by adding to cart and entering in your ZIP code or country.

By purchasing this item you agree to the Terms and Conditions.

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