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BMW M5 F90 (2018+) General Forums Engine, Exhaust, Drivetrain, Tuning Modifications    JB4 + BOOTMOD from 131 to 138 miles in 7 days

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      11-20-2020, 05:40 PM   #23
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Quote:
Originally Posted by TTHURACAN View Post
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.
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      11-22-2020, 10:07 PM   #24
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Quote:
Originally Posted by LongBeachDinanFan View Post
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)
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      11-23-2020, 03:42 AM   #25
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Quote:
Originally Posted by FSociety View Post
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.
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      11-23-2020, 10:33 AM   #26
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Quote:
Originally Posted by FSociety View Post
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.

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      11-25-2020, 02:14 PM   #27
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Quote:
Originally Posted by LongBeachDinanFan View Post
Quote:
Originally Posted by FSociety View Post
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.

JB4 only is terrible and inconsistent. The car will go from being a monster to running worse times than stock
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      11-26-2020, 03:13 PM   #28
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Quote:
Originally Posted by edwarjejeega View Post
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.
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      11-26-2020, 05:39 PM   #29
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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
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      11-26-2020, 07:32 PM   #30
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Quote:
Originally Posted by greentrbo95gst View Post
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.
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      03-09-2021, 11:16 AM   #31
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some updates, now with better E85 using same BM3 OTS 30 + JB4 custom map 6.
60 to 130mph 6.02
10.13@139mph with 1.65 on 60ft
Car full weight, all weather tires.
Probably could achieve a constant 9sec with better 60f in summer time.



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      03-09-2021, 10:20 PM   #32
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Quote:
Originally Posted by greentrbo95gst View Post
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
No ECU tunes available on 2021s yet. When my car is delivered in March I will be playing the waiting game also
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      03-10-2021, 08:02 AM   #33
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      03-10-2021, 01:25 PM   #34
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Quote:
Originally Posted by luchocamp View Post
Damn that is impressive! Can you post a jb4 log? I would love to see the boost/afr/timing during a run.

Absolutely incredible when you think it wasn't that long ago where a 9 second car could BARELY be driven to the track and most likely didn't even have an interior .
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      03-11-2021, 04:24 AM   #35
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      03-12-2021, 11:17 AM   #36
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Ive had my Jb4 in for about a month now on my M8, on map 1 no issues, i only have BMC filers and secondary cat delete as of now but the car is notably faster.

What issues have owners been seeing?
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      03-12-2021, 11:49 AM   #37
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Quote:
Originally Posted by luchocamp View Post
Wow pushing nearly 20 degrees timing at 25+psi and trims are still relatively low even with a e30 mix. Pretty amazing how hard the stock engine can be pushed.
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      03-12-2021, 12:15 PM   #38
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Quote:
Originally Posted by Quinn A View Post
Ive had my Jb4 in for about a month now on my M8, on map 1 no issues, i only have BMC filers and secondary cat delete as of now but the car is notably faster.

What issues have owners been seeing?
Won't see much issues reported on map 1. When you start pushing it harder is where you can get in trouble if your not careful. I am no expert but what I have learned is If you want try the higher maps/custom maps start logging on the jb4 app and look at your timing, afr and trims. Look for timing dips that indicate the DME is lowering timing because it's detecting knock (timing going to zero during shifts is normal though). At this point you can mix in some E85 gas to raise the octane, start with a few gallons and then watch your trims.

The trims are the short term Fuel Trims, the DME can raise or lower the air fuel mixture this way, since E85 has less energy density then normal gas due to the ethanol content, the DME will adjust fuel trims to compensate. It only has so much headroom to adjust however. That is why you just want to start with a few gallons and work your way up. E85's ethanol content can vary also (55-85 percent in many states).
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      03-12-2021, 01:41 PM   #39
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thousands of users with excellent results using map 1, 2 3 etc depending on the other parts installed in their cars

Quote:
Originally Posted by Sophisticated Redneck View Post
Won't see much issues reported on map 1. When you start pushing it harder is where you can get in trouble if your not careful. I am no expert but what I have learned is If you want try the higher maps/custom maps start logging on the jb4 app and look at your timing, afr and trims. Look for timing dips that indicate the DME is lowering timing because it's detecting knock (timing going to zero during shifts is normal though). At this point you can mix in some E85 gas to raise the octane, start with a few gallons and then watch your trims.

The trims are the short term Fuel Trims, the DME can raise or lower the air fuel mixture this way, since E85 has less energy density then normal gas due to the ethanol content, the DME will adjust fuel trims to compensate. It only has so much headroom to adjust however. That is why you just want to start with a few gallons and work your way up. E85's ethanol content can vary also (55-85 percent in many states).
.
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      05-25-2021, 11:00 AM   #40
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We got some new records, same car same configuration just change for better E85 not pump.
10.23@140.78mph

still using BM3 OTS E30 + JB4 on Custom Map 6 //LPopwer...

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Last edited by luchocamp; 05-25-2021 at 11:37 AM..
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      05-25-2021, 02:49 PM   #41
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140 in the quarter for a luxury sports sedan is impressive, especially for so few mods — downpipes, tune plus piggyback, intake and race gas or E85 mix.

No E85 near me and race gas is too expensive to use daily so I will be trying water/meth. Have only JB4 - no DP or tune or intake yet.
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      06-16-2021, 10:03 AM   #42
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Quote:
Originally Posted by pbonsalb View Post
140 in the quarter for a luxury sports sedan is impressive, especially for so few mods — downpipes, tune plus piggyback, intake and race gas or E85 mix.

No E85 near me and race gas is too expensive to use daily so I will be trying water/meth. Have only JB4 - no DP or tune or intake yet.
great, keep it up
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