SKU: 67236079825

N54 JB4 BMW Performance Tuner

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Description

N54 JB4 BMW Performance TunerN54 JB4 BMW Performance Tuner 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

 

N54 JB4 BMW Performance Tuner

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 driver's 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 in 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 set up 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! 

 

Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit, or to your Windows laptop with the BMS data cable. Both options allow you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. A separate JB4 Mobile app purchase is also required.

Note: This item is not CARB (California Air Resource Board) exempt and is not legal for sale or use in the state of California.

Click here for the latest N54 JB4 firmware, map guide, and details.

N54 JB4 Features & Benefits

• N54 Power gains of up to 100hp and 100tq to the wheels on a stock vehicle
• Improves 0-60 and quarter mile times.
• Includes multiple tuning maps for different fuel types.
• Quick plug and play installation.
• Supports E85 ethanol blends.
• Reads and deletes fault codes.
• Displays and logs up to 40 engine parameters.
• Boost by gear control for improved traction.
• Controls exhaust flap operation on supported vehicles.
• Compatible with the JB4 Mobile app.
• Offers better performance and safety than basic chip tunes.
• Full CANbus integration.
• Runs as smoothly as stock.
• Compatible with all driving modes.
• No impact on fuel economy during normal driving.
• Requires 91 octane or better for performance gains.
• Not VIN locked and fully removable.
• Includes billet aluminum enclosure.
• Designed and assembled in the USA.
• 5-year warranty.

Vehicle Fitment

BMW 1 Series

• 2008-2010 E82 BMW 135i Coupe
• 2008-2010 E88 BMW 135i Convertible
• 2011 E82 BMW 1M

BMW 3 Series

• 2006-2010 E90 BMW 335i Sedan including xDrive
• 2006-2010 E91 BMW 335i Touring including xDrive
• 2006-2010 E92 BMW 335i Coupe including xDrive
• 2007-2010 E93 BMW 335i Convertible
• 2011-2013 E92 BMW 335is

BMW 5 Series

• 2008-2010 E60 BMW 535i Sedan including xDrive
• 2008-2010 E61 BMW 535i Touring including xDrive

BMW X Series

• 2008-2010 E71 BMW X6 xDrive35i

BMW Z Series

• 2009-2016 E89 BMW Z4 sDrive35i and Z4 sDrive35is 

 

What is a JB4?
The JB4 is a plug and play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way, the JB4 separates itself from the competition with much more advanced connection points and processing, including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can be quickly removed and swapped between cars or resold at a later time. Often imitated but never duplicated, the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.

 

Is the JB4 a real tune?
Yes the JB4 is a real tune. By tapping into specific sensors and CANbus for real time vehicle data the JB4 is able to alter your boost, timing, AFR, and/or fuel trims, to a similar degree an ECU reflash would, but without the vehicle ever knowing its been tuned. The result is safe, smooth, and significant power and torque gains while retaining your factory safety systems and without having to unlock/flag your ECU.





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

JB4 Optional Phone Software





N54 JB4 Install Video


JB4 135i 335i Steering Wheel Controls Demo Video


JB4 Optional In Dash Boost Gauge/Shift Light Demo


JB4 Optional Startup Gauge Sweep

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 67236079825

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4.2 ★★★★★
Based on 5 reviews
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Product Reviews
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Verified Purchase
Dev Girl
Lowell, US
★★★★★ 4
Well written, entertaining - whether this stuff is true or not depends on your opinion.
Format: Paperback
I loved Monroe's first book. *This* book is entertaining, although annoying at times trying to figure out who's talking. I'm silent on whether I believe Monroe's fantastic stories. But if you're okay with that risk, I'd recommend this for both entertainment & perhaps to help unleash some creativity in your self.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 27, 2024
A
Verified Purchase
Andrea Freund
Bozeman, US
★★★★★ 5
Changed forever
Format: Kindle
We become so mired in our subjective “reality”. I find it truly beneficial to have a different, perhaps more objective perspective. I hope this enables me to make necessary changes to my journey before its conclusion.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 30, 2025
L
Verified Purchase
life is good
Boise, US
★★★★★ 5
Enlightening!
Format: Paperback
A history of Monroe's discoveries and seminars I took his seminars in the 1993-4 periods Excellent beyond my expectations
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2025
G
Verified Purchase
GiveHerAGoodMunchin
Lowell, US
★★★★★ 5
Excellent trilogy. This is book 2
Format: Paperback
Bob Monroe is an OG OBE G. Love this trilogy. If you can read, read this
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 25, 2025
J
Verified Purchase
Joe Neal
Pawtucket, US
★★★★★ 5
Great (excellent) details for the date written
Format: Paperback
NOTE: I toned this version down in 2021 – I was in a bad place when I wrote the original and there were some hostile and entirely inaccurate personal remarks in it. A few tables/charts with a wealth of information have tiny text but most of this was easy enough to read. The photos are poorly produced (at least in the paperback version I reviewed), which is sad given they would be so handy otherwise. This is a classic post-war treatise on the weapons used for ground warfare during World War II by the U.S. Army and as such the Marines. It was first published around 1947 when the war was fresh and doubtlessly numerous technical details were still classified. It was written by a man intimately involved in many design projects. The coverage pretty much explains the breadth. Examples of use are included for some weapons and detailed tables of data for many. He explains references to the "long primer" for the 76-mm gun and the 81-mm mortar T1 extension tube. I am happy to have bought it for that and numerous other details. One thing I missed when I first wrote the original rambling, a bit over the top review back in September 2015 was that the 57mm M1 antitank gun is not mentioned even though it was a key component of Infantry weaponry in 1944-45, sometimes maligned but often quite effective when carefully used as noted in many, many detailed accounts. Perhaps it was skipped because it was a revision of the British 6 pounder and not designed by Barnes men? Yet, it is an example of the issues caused by the pre war budget minders forcing the Army into desperate choices as explained later – and the using arms who decided to adopt it almost at the last minute, late in 1943. Until a weapon is adopted by the Army ammunition cannot be developed – it costs too much money and time to do so. Most of the book is positive and ignores failures, posed from the viewpoint of a proud designer not an actual user. Yet those failures illustrate the issues Ordnance had to deal with during the war. The U.S. invented the bazooka as the 2.36-inch model in 1942 yet the Germans fielded the more powerful 8.8-cm (88mm) model in 1944; and the U.S. did not get the 3.5-inch (90mm) into production-ready state until the war was ended. This was caused by offloading development onto people who went out for a “super rocket launcher” that had no place in the war. All too often, some excited designers did indeed get ahead of themselves when it came to what worked but was a bit too much (and ultimately impractical for the Army at the time). The inability to develop hollow-charge (HEAT) ammo for cannon and howitzers to reach its minimum potential (twice the caliber in penetration or better) was common for all countries including the U.S. The 105mm howitzer round was pretty good and while disparaged by all and sundry even the 75mm howitzer’s shell could (and did) take out medium armor. Barnes refers to the M3 and M5 light tank as "excellent" when the tanker's epithet would have been "tin plated coffin with a pea-shooter". Here we have an issue with comparing numbers such as armor thickness and penetration power of guns to facts; it is common to think they were butchered such as in Africa when in fact they fought well enough, flaws and all. But they were not the weapons the tankers wanted (nor deserved), and thus tanker’s complaints were valid. And, yes, they were not seen as a prime resource for fighting German tanks and hence reverted to recon and infantry support roles. Where they continued to meet and destroy German armor (but also be destroyed). Any German field commander would have loved to have a battalion of M5s on hand chasing down and chewing up U.S. troops; the contribution of the men in the light tanks in Europe in 1944 and 1945 is all too often belittled by the “number nerds” who toss the light tanks off as useless. They were anything but useless. Why were the M10, M18, and M36 designed as “Gun Motor Carriages” and not tanks? Because they were developed for the tank destroyer forces and the very bigoted officers who held the most sway on development wanted them to be nothing but “motorized antitank guns”. If they had been designed as tanks that would have invalidated Tank Destroyer Doctrine immediately. And yet, in the end, the men doing the fighting needed and wanted tanks, so they used them as tanks as much as they could, despite the open roof and lack of internal machine guns. It is claimed the gun motor carriages were cheaper than tanks (a specious argument given price varied by manufacturer and ultimately depended more on quantities produced not some arbitrary raw number) but to produce the gun motor carriages for a specialist role that was neither tank nor artillery (albeit they were used for both) was a costly thing to do. The failure to develop a better light tank in time is not mentioned even though the T7 light tank with a 57-mm gun was ready in mid-1942 and could have been in the field around 1943 (the Armored Forces botched that one). The M24 was a nice tank but too late simply because development came too late because development had been stunted badly by congress and it’s miserly pre-1941 budget. There are errors: The design of the M24 began in 1943, not 1945. The 76-mm gun could hardly penetrate the "...heaviest German tank armor." But it could penetrate a lot of armor and the myth that all German tanks were Tigers and Panthers is one of those fantasies of the war pursued by people who are glorifying the war not understanding it (most German armor was medium or lighter), let alone the myth that they were always met head-on is ridiculous. The 90-mm gun was not optimized for anti-tank use and hence had the same issues with dealing with the frontal armor of the Panther (though it could handle the Tiger) and yet was better at that than many other guns. The tendency to adapt anti-aircraft guns for anti-tank guns was common and is where Germany got its 88s and the 128mm. The U.S. found it did not need a lot of 90mms (the homeland was not threatened and what it produced was enough for its needs); there was never the demand for a higher altitude version and hence nothing like the 8.8cm FLAK 41 was developed which led to the 8.8cm Kwk43 and Pak43s; yet Ordnance built their own versions of hot 90mm for tank use. I missed the boat in my original review failing to detail how the Army’s main issue was the budget provided by Congress and politicians from 1920 through 1940. They starved the Army; the U.S. was peaceful and they had no interest in making it a military country and as such kept the Army small (and starved the air forces and Navy as well but not as badly). This crippled development; while the Soviets started building a modern Army in 1930 complete with investment in tank forces and tank arsenals; the Germans in 1934 or so; and British in 1934 or so; the U.S. politicians did not begin serious spending on the Army until 1941. Before then, the budget was all about “beans, bullets, and bayonets” and of course bodes to wield them. The Army had to struggle with what it had and put to field what was practical not what was best. Thus, for example, the recoilless rifles (used by the Germans in 1940) did not arrive in U.S. use until 1945. And yet a U.S. officer bult the first recoilless rifle to be used way back around 1916. Indeed, a brief little discussion on how the U.S. produced what it did based on budget would have opened many eyes. The Soviets produced so many thousand T34s for example, more than the U.S. – and in the U.S. the budget people were always saying, “You don’t need any more, stop building them!” As mentioned, the number of 90mm AA guns the U.S. produced was not based on manufacturing capacity but because they didn’t need more. Thus - there is a lot of information and many details many people will never have heard before. There are also many missing details concerning the Ordnance Department struggles to get things done in a very brief time frame thanks to how Congress had refused to let them do anything earlier. Dig into that deeper and you might find it nauseating the way people played games that hindered the U.S. Army in its job of helping beat the Germans. And sometimes couldn't put 2 and 2 together to get the right answer. But, they were human after all, and people do make mistakes. In my original review I argued that “If you want a politics free book you will not get it in this once, not unless you shut your eyes and remain ignorant . . .” but that is wrong. If this was a political book, Barnes might have ripped the budget mongers of the 1920s and 1930s a new sphincter for leaving the Army (and U.S. military as a whole) in such a bad situation as they did when war broke out. But, Barnes had more class than I do.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 19, 2015

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