[LongBeachDinanFan]

Originally Posted by TTHURACAN

You don’t , a lot of these modded M5s running more than 3psi over stock are already bending rods and don’t even know it. It then becomes a question of time, the closer they get to that 140mph trap the more likely it will occur.....

Use the JB4 to reduce boost a bit in the peak torque range for daily use to preserve the rods.

[FSociety]

Originally Posted by LongBeachDinanFan

Biggest advantage to adding a JB4 to a flash map is being able to adjust tuning on the fly and the extra safety systems provided. In a lot of cases though, customers find the JB4 alone adds so much performance they don't even need the flash tuning so something to keep in mind too.

Said no one ever, u write just like Terry (thought u were banned from here)

Jb4 is known to only add torque and not HP, bye bye rods #jb4 #rodsGoFirstWithJb4 #stayStock or BM3 (proper flash)

[luchocamp]

Originally Posted by FSociety

Said no one ever, u write just like Terry (thought u were banned from here)

Jb4 is known to only add torque and not HP, bye bye rods #jb4 #rodsGoFirstWithJb4 #stayStock or BM3 (proper flash)

too much talk....but years later now bm3 start selling a board that makes almost the same JB4 has been doing since 2010.

FSociety Do not focus too much in other companies performance take that time to focus in improve yours.

[LongBeachDinanFan]

Originally Posted by FSociety

Said no one ever, u write just like Terry (thought u were banned from here)

Jb4 is known to only add torque and not HP, bye bye rods #jb4 #rodsGoFirstWithJb4 #stayStock or BM3 (proper flash)

Huh?

Torque and horsepower are the same thing measured different ways. There are F90 M5 running low 10s on JB4 only so I'm sure it's adding plenty of horsepower not to mention the dynos they've posted.

[edwarjejeega]

Originally Posted by LongBeachDinanFan

Huh?

Torque and horsepower are the same thing measured different ways. There are F90 M5 running low 10s on JB4 only so I'm sure it's adding plenty of horsepower not to mention the dynos they've posted.

JB4 only is terrible and inconsistent. The car will go from being a monster to running worse times than stock

[LongBeachDinanFan]

Originally Posted by edwarjejeega

JB4 only is terrible and inconsistent. The car will go from being a monster to running worse times than stock

I ran one on my M3 for a few years and never had a single issue, was always consistently fast. It probably depends on what maps you use, what settings you use, whether the JB4 itself is going to safety map to try to correct a tuning issue, and those sorts of details. You just post up a JB4 log of it running fast and another log of it running slow if you have that issue and they can tell you why and how to fix it.

[greentrbo95gst]

I just picked up my 21 M5 comp yesterday and I have been trying to decide between BM3 and JB4, but hard to find good opinions these days. I even asked several vendors on this board with no response.
Are you guys able to tell me major differences between these two and main things I should be concerned with? Thanks

[LongBeachDinanFan]

Originally Posted by greentrbo95gst

I just picked up my 21 M5 comp yesterday and I have been trying to decide between BM3 and JB4, but hard to find good opinions these days. I even asked several vendors on this board with no response.
Are you guys able to tell me major differences between these two and main things I should be concerned with? Thanks

BM3 is a flash tune that changes tables in the ECU, JB4 is a piggyback system that plugs in to sensors in the engine bay and changes the tuning that way. They have a FAQ that answers most of the basic questions but the bottom line is flash tuning can make a little more power but then you void your warranty/lease, meanwhile JB4 can be a little more of a headache but it can be removed without a trace when needed.