JB4 Map 6 For 2020-Present BMW Z4 M40i | E30 Fuel
B58TU Gen 2 | Single Map For 93 Octane
(Engine Code B58B30O1 Only)
A Transmission Tune Is Required To Utilize Our Customized Tuning Services
In the age of FEMTO, enthusiasts need an affordable, accessible and reliable way to add power to their BMW without sending their DME overseas for an unlock.
Similar to flash tunes, JB4 maps customized to your specific vehicle are always superior to off the shelf maps. The reason being, every car is different and will operate and perform differently, even if they are the exact same make, model, year, engine and trim. In addition to normal variation in factory tolerances, location, weather, fuel type and modifications will also make a difference in how a car performs. By honing in vehicle specific parameters, we can provide a more powerful and smoother map vs any off the shelf options. There is no doubt that OTS maps and flash tunes make a notable difference over stock, but the real magic happens when a vehicle specific, data driven approach is taken.
Purchase a NXTGEN custom map 6 today, and allow our team to help you take your JB4 equipped BMW to the next level.
Post Purchase Information
Upon purchasing our custom tuning solutions, a team member will contact you via email with instructions within 1 business day from the time of purchase. Please make sure to provide a valid email during checkout, as this is the primary method of contact for these services. If you have not received an email from us within 1 business day or less, please check your spam folder.
Please note: custom tuning services are not covered under the NXTGEN product warranty and are used solely at your own risk. For more information, please see our terms of service.
B58TU Gen 2 | Single Map For 93 Octane
(Engine Code B58B30O1 Only)
A Transmission Tune Is Required To Utilize Our Customized Tuning Services
In the age of FEMTO, enthusiasts need an affordable, accessible and reliable way to add power to their BMW without sending their DME overseas for an unlock.
Similar to flash tunes, JB4 maps customized to your specific vehicle are always superior to off the shelf maps. The reason being, every car is different and will operate and perform differently, even if they are the exact same make, model, year, engine and trim. In addition to normal variation in factory tolerances, location, weather, fuel type and modifications will also make a difference in how a car performs. By honing in vehicle specific parameters, we can provide a more powerful and smoother map vs any off the shelf options. There is no doubt that OTS maps and flash tunes make a notable difference over stock, but the real magic happens when a vehicle specific, data driven approach is taken.
Purchase a NXTGEN custom map 6 today, and allow our team to help you take your JB4 equipped BMW to the next level.
Post Purchase Information
Upon purchasing our custom tuning solutions, a team member will contact you via email with instructions within 1 business day from the time of purchase. Please make sure to provide a valid email during checkout, as this is the primary method of contact for these services. If you have not received an email from us within 1 business day or less, please check your spam folder.
Please note: custom tuning services are not covered under the NXTGEN product warranty and are used solely at your own risk. For more information, please see our terms of service.
B58TU Gen 2 | Single Map For 93 Octane
(Engine Code B58B30O1 Only)
A Transmission Tune Is Required To Utilize Our Customized Tuning Services
In the age of FEMTO, enthusiasts need an affordable, accessible and reliable way to add power to their BMW without sending their DME overseas for an unlock.
Similar to flash tunes, JB4 maps customized to your specific vehicle are always superior to off the shelf maps. The reason being, every car is different and will operate and perform differently, even if they are the exact same make, model, year, engine and trim. In addition to normal variation in factory tolerances, location, weather, fuel type and modifications will also make a difference in how a car performs. By honing in vehicle specific parameters, we can provide a more powerful and smoother map vs any off the shelf options. There is no doubt that OTS maps and flash tunes make a notable difference over stock, but the real magic happens when a vehicle specific, data driven approach is taken.
Purchase a NXTGEN custom map 6 today, and allow our team to help you take your JB4 equipped BMW to the next level.
Post Purchase Information
Upon purchasing our custom tuning solutions, a team member will contact you via email with instructions within 1 business day from the time of purchase. Please make sure to provide a valid email during checkout, as this is the primary method of contact for these services. If you have not received an email from us within 1 business day or less, please check your spam folder.
Please note: custom tuning services are not covered under the NXTGEN product warranty and are used solely at your own risk. For more information, please see our terms of service.
Benefits of JB4 Map 6 Tuning:
1. Full Custom Control by RPM
We can control boost, fuel bias, and duty bias at each 500 RPM interval
Enables precision tuning for your exact fuel, mods, IAT behavior, etc.
Can shape your powerband to match your turbo’s efficiency curve or torque limits
2. Built-in Safety Layers Stay Active
Still uses factory DME knock correction, throttle intervention, fuel trims, etc.
You can’t blow the car up with just bad boost targets — the DME will still protect it (to a point)
Boost failsafe acts as an upper safety net
3. Perfect for E-Blends or Custom Fuels
93, E30, E40, E50, race gas — you can fine-tune the map for different fuels
Adjust fuel algorithms and boost pressure to extract more timing safely
Lets you safely run stronger and more consistent than generic maps without flashing the ECU
4. Adapts with Hardware
If you add a downpipe, intake, port injection or intercooler — we can update the map 6 to fine tune
Unlike Maps 1–2, you're not locked into a predetermined set of assumptions or algorithms
What Driving a BMW with a Well-Dialed NXTGEN Map 6 Feels Like:
1. Stronger Low-End Without the Lag
Map 6 can boost 2–3 psi earlier than OTS maps with the right duty bias settings
You feel the car move instantly at 2000–2500 RPM with no lag or delay
Perfect for daily city driving, stoplight jumps, and early pulls
2. Midrange Power (3000–5000 RPM)
Boost hits hard, torque is immediate
This is where a well tuned Map 6 starts to feel way stronger than Map 2 or 3
3. Cleaner Throttle & Less DME Intervention
You don’t get that “blip” of closure or hesitation when the DME freaks out
JB4 is tuned to stay within torque limits, so throttle stays open
Results in cleaner pulls, even in multi-gear WOT
4. More Consistent Timing (Especially on E30–E40)
Custom boost taper up top helps keep ignition advance stable
Less knock = smoother, safer power = more usable HP
5. Better Multi-Gear Pulls
Off-the-shelf maps can feel jumpy or throttle-y when going 2nd–3rd–4th
A dialed Map 6 is linear and composed, especially with xDrive or hybrids
A NXTGEN custom map 6 is smoother, stronger, more stable and consistent versus off the shelf maps, for a more flash tune-like feeling.
