Because of the dynamic nature of JB4 tuning, it is able to self-tune critical and difficult-to-dial-in aspects of tuning such as wastegate control and fuel trim range for various modifications, climates, and vehicle conditions, largely eliminating the need for expensive and time-consuming custom flash tuning.

The JB4, on the other hand, ranges from $479-$900 and includes 8 unique maps, including maps for pump gas, race gas, ethanol fuels (E85), factory tuning, VALET mode, WMI integration, and a user-defined map. For more advanced higher-power maps, “custom tuning” is usually required which can double the flash cost. While performance is usually very similar between the two there are a few things the JB4 just can’t do including changing fuel injection timing (exhaust pops and bangs), raising the RPM limiter, adjusting valve timing, and in some cases, raising the speed limiter.Ĭost: There is a wide range of price variance for flash maps ranging from a few hundred dollars up to several thousand depending on the application. But it’s also more limited relative to a flash tune as it is working off the factory flash tables. Performance: The JB4 is able to achieve a dramatic performance increase, completely transforming your vehicle. Even if flashing to stock later, permanent traces of the more aggressive tuning will be stored in your ECU, transmission computer, stability control module, and, if flashed via the OBDII port, also your gateway module. Flash tuning, while easy to install, can never be fully removed. Once you’ve installed it once, most JB4 systems can be fully removed in less than 10 minutes. With the JB4 you plug it into sensors in the engine bay, usually taking 20 to 30 minutes the first time as you learn where each sensor is for your specific model.

Installation: Flash tuning can be simpler initially as there is no extra hardware to install. So which is better? A better question is probably which is better for your specific needs? Usually loaded via the vehicles gateway on the OBDII port, but in some applications directly to the ECU by drilling a hole or disassembling the ECU to access the processor inside. This CANbus connection provides a complete set of real-time operational data which is then dynamically incorporated into your JB4 tuning.Ī flash tune, on the other hand, modifies the tables on the ECU directly for higher performance. Unlike other similar-looking tuning systems the JB4 is also able to tap in to CANbus - analogous to a spinal cord - allowing it to communicate and receive information from not only the ECU but also the transmission computer, stability control module, dash module, and many others. The JB4 is a programmable computer that attaches between the ECU and vehicle sensors allowing it to adjust your vehicle’s tuning by tapping into areas of the factory flash mapping that are not normally available. JB4 vs cobb bm3 bootmod3 mhd apr giac dmetune weistec flash hptuners eurocharged unitronic ktuner hondata openflash and countless others. This question comes up often when customers are evaluating what method to use for modifying their vehicle’s performance. What’s the difference between a JB4 and a flash tune?

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