BM3 vs JB4 w/ BEF

[AleksDeRussian]

I have a 2015 M4 with catless DPs and JB4. I also have Alex's GTS flashes. I have been looking into getting a flash tune and can not find an answer which route would be the better option. I plan on getting BM3 and was wondering if I should just flash their stage 2 tune and just use the JB4 for gauges and logging or would it be better to flash the BMS BEF and keep using JB4 map 2 or 5? What are the pros and cons of both?

PS:
I know MHD is cheaper for flashing BMS BEF but I am interested in BM3. Also I'm not sure about methanol injection just yet.

[mike@x-ph.com]

The pros of actively using the Jb4 is to control boost direct instead of using the flash for it. Meaning you can adjust boost very easily by setting the PSI level on the Jb4 app.

Other useful Jb4 features are the safety failsafes but that can be used even with the Jb4 tuning off (map 4)

[AleksDeRussian]

Originally Posted by mike@x-ph.com

The pros of actively using the Jb4 is to control boost direct instead of using the flash for it. Meaning you can adjust boost very easily by setting the PSI level on the Jb4 app.

Other useful Jb4 features are the safety failsafes but that can be used even with the Jb4 tuning off (map 4)

So running JB4 with the race BEF would be the best of both worlds? I'll get the benefits and features of JB4 and the smoothness of a flash tune? Also what will the power look like just running BM3 stage 2?

[AleksDeRussian]

Do all of the flash features from BM3 with with the JB4 RACE BEF? Like start up roar, burbles, cold start delete, and valve control?

[Fuel-It!]

Yes anything you do on the flash side carries over

[chipper1]

so I have a alpine stage 2+ flash tune on my fbo m4 if I put a JB4 on my car I was told i could only use map 0 pass through. is this correct? what's different about there backend flash?

[TopJimmy]

Originally Posted by chipper1

so I have a alpine stage 2+ flash tune on my fbo m4 if I put a JB4 on my car I was told i could only use map 0 pass through. is this correct? what's different about there backend flash?

An Alpine Stg2+ already has the timing and boost adjusted in the flash, that's why Alex would tell you to use JB4 Map0, so JB4 doesn't add more boost but still allows JB4 monitoring to be used. Some tuners allow Meth/PI control through the JB4, but coordinated with timing/fuel/boost through their Flash map.

The BEF only has fueling and timing adjustments for the fuel, and the JB4 can still add the boost increases on top of the BEF.

I did not use the BEF+JB4. I only used the BEF in Bootmod3 to try running E85 at stock boost.