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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > Jb4 help needed please.



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      06-09-2020, 02:42 AM   #1
drew 007
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Jb4 help needed please.

Hello Guys, I’m looking for somebody that’s more then confident with the jb4 and ideally on the N54 platform.

I’ve recently bought a e92 335i which has come with this fitted but I would really like somebody in the know to have a look at the car as I’m not 100% it’s all running correctly.

Whenever I drive the car with the unit turned on I seem to get the hazard lights flashing now I’ve searched and found one of the four reasons these units will flash at you but I seem to get one flash then three then one long one so no continuity hence the reason I would like somebody in the know just to cast there eye over it if possible. I’m in South Yorkshire but don’t mind traveling for the right person as at the moment the jb4 is turned off.

Any help will be much appreciated.

Kind regards,

Drew.
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      06-12-2020, 03:00 AM   #2
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Hi did you get this sorted?
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      06-12-2020, 03:31 AM   #3
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Sadly not buddy, I can’t find anybody that’s fits or works on these units to see if I could take it there For them to have a look.

The jb4 is turned off.
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      06-12-2020, 11:01 AM   #4
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Wasn't there an option in the JB4 to flash the hazard indicators only on the dash, when it is time to shift?

I vaguely recall some option like this.

Check to see if when this happens the exterior lights are also flashing, if not you have your answer.
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      06-12-2020, 06:57 PM   #5
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Hello buddy, Really appreciate the comment you are correct in that is does have that function but when I get the flash of the indicators it’s no where near the rev limiter or factory clock rev limit.

When the jb4 is operational it will detect a fault and put the unit back into setting 4 which is like a factory map for the jb4. Ive also noticed with the jb4 on it knocks my speedo out by 10 mph as well.

I had my Carly plugged in yesterday while out and was keeping an eye on my coolant and oil temps which was all running fine until I engaged jb4 via the steering wheel once the jb4 was running my oil temp more then doubled and my coolant temp halved within 20 secs..

Before jb4 is turned on.. oil 98.60oc coolant 81.75oc

While jb4 is turned on.. oil 275.10oc coolant 27.75oc

Very strange I just wish I knew what I was looking at and had some experience With the jb4 as it may be something simple?

Kind regards,

Drew.
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      06-13-2020, 01:15 AM   #6
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When the Jb4 is turned on OBD2 reads are inaccurate.

That is why you must set map0 to program.

Try switching off the JB4 after you use it then immediately check the temps.
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      06-13-2020, 03:49 AM   #7
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Hello buddy, is that a rule of thumb that the OBD2 reads inaccurate?

And map 0 is the unit turned off no JB4’s active and as above I’ve checked already and it wasn’t good readings there all over the place.

Kind regards.

Drew.
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      06-13-2020, 04:21 PM   #8
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Yes the JB4 hijacks the data lines to intercept and adjust the sensor readings.

What map were you running before the JB4 reverted to MAP4?

Can you run map1 without issues.

The JB4 will also flash the lights as you described if there is an over boost condition and revert to map4 when that happens.
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      06-13-2020, 06:04 PM   #9
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Hello buddy, I was running in map 5.

I will have a run out tomorrow/today and see what happens in map 1 and report back but I’ve got a feeling il end up back in map 4!

Also while stationary and the jb4 on the rev counter is barely moving the revs sound normal but the rev clock is at the very bottom. But when the jb4 is off clocks back to normal.
Is this normal behaviour?

Kind regards,

Drew.
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      06-13-2020, 06:16 PM   #10
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Personally I'd remove the jb4 & get a decent remap

Just out of interest what other mods does it have?
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      06-14-2020, 12:56 AM   #11
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Yeah I’m thinking that myself but would like to know if there is any problem with the unit for future reference.

And mods on the car are decats, exhaust system, induction and I believe up rated front mount intercooler.

Kind regards,

Drew.
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      06-14-2020, 11:59 AM   #12
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Quote:
Originally Posted by drew 007 View Post
Hello buddy, I was running in map 5.

I will have a run out tomorrow/today and see what happens in map 1 and report back but I've got a feeling il end up back in map 4!

Also while stationary and the jb4 on the rev counter is barely moving the revs sound normal but the rev clock is at the very bottom. But when the jb4 is off clocks back to normal.
Is this normal behaviour?

Kind regards,

Drew.
No that is not normal at all.

Either the Jb4 is not working properly (bad flash?) or it is miswired.

Do the gauges sweep when it is turned on or the car is started?
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      06-14-2020, 03:41 PM   #13
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Hello, if the car was to be started with the jb4 turned on I get the dial sweep yes also the fuel gauge go’s to a boost gauge!

Kind regards,

Drew.
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      06-17-2020, 01:59 AM   #14
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Hi, so the JB4 as above hijacks the signals so the best thing to do turn it off if using another device to read codes etc.

I would also say that it may be on auto error clearing and so when you get the error occurring the JB4 is clearing the error as well as shifting it to a safe map with reduced boost etc.

You can remove the hijack of the dials so that it doesn't use it as a boost gauge etc.

Something isn't quite right but hard to tell without seeing it in person.
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      06-19-2020, 05:26 AM   #15
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Quote:
Originally Posted by RajB View Post
Hi, so the JB4 as above hijacks the signals so the best thing to do turn it off if using another device to read codes etc.

I would also say that it may be on auto error clearing and so when you get the error occurring the JB4 is clearing the error as well as shifting it to a safe map with reduced boost etc.

You can remove the hijack of the dials so that it doesn't use it as a boost gauge etc.

Something isn't quite right but hard to tell without seeing it in person.
Hello buddy, thanks for that yeah I had a feeling something wasn’t right so that’s why I’m running the unit turned off until I can take it somewhere and have it looked at.

Kind regards,

Drew.
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      06-19-2020, 05:10 PM   #16
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I'd try it in Map 1 to see what that gives you. Also check around the glovebox area for a USB lead which will connect to your laptop/tablet or you may be lucky and it's a Bluetooth version in which case you'd connect to it from your phone. Free or paid versions of the JB4 software can be downloaded from Burger or the Play Store IIRC, first thing is to update to the latest firmware and then read the fault codes from the JB4 app.

Burger Motorsports have a page which details every option on the JB4, I'd set them all back to default and then work from there and I'd also get hold of the previous owner and ask him/her what version of JB4 it is and if there's any options added. I wouldn't be too quick to bin it as it can be a very handy bit of equipment.

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      06-19-2020, 05:52 PM   #17
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Quote:
Originally Posted by drew 007 View Post
Hello buddy, thanks for that yeah I had a feeling something wasn’t right so that’s why I’m running the unit turned off until I can take it somewhere and have it looked at.

Kind regards,

Drew.
You can disable the auto error clearing which means you can also use the JB4 to read out the codes either via the dial hi-jack or connecting your laptop up as Hibbyfor mentioned above.
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      06-20-2020, 05:28 PM   #18
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Do you have a data cable or Bluetooth connector to the jb4?

After the four blinks do you go into map4? If yes then...
You will not get an error code for this as you have experience. You will need to download the jb4 app and connect it to the jb4. Then go to settings > user adjustment. Scroll to the bottom "Last Safety", this will tell you why you've been kicked into map4.

Also I highly recommend getting a back end flash for the jb4. It retains the safety features l, allows jb4 to control your meth flow as I am using it, but with the benefit of a custom flash.
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      06-21-2020, 05:03 PM   #19
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As Imy said.

Over boost detection will cause that.
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      06-22-2020, 04:27 AM   #20
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Thanks for the info gents much appreciated I’m looking at taking the jb4 off the car as I’m Not a fan of the unit.

Yesterday while sat in the car I turned the jb4 on and the clocks give me the sweep but when I go onto the settings ie on the rev counter to switch maps my first setting which should be at 1000 revs is at 1500 my second map is at 3000 rather then 2000revs third map is 45000 revs and so on.. so the unit is playing up.

A lot of headache to say the jb4 should be plug and play!!

I’ve had a look and can’t find any lead in the car so I’m at bit of a lose end with the problem.
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      06-22-2020, 09:44 AM   #21
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Sounds like the dial is not calibrated to the JB4.

I think there is a way of adjusting that.
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      06-22-2020, 06:18 PM   #22
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Quote:
Originally Posted by drew 007 View Post
Thanks for the info gents much appreciated I’m looking at taking the jb4 off the car as I’m Not a fan of the unit.

Yesterday while sat in the car I turned the jb4 on and the clocks give me the sweep but when I go onto the settings ie on the rev counter to switch maps my first setting which should be at 1000 revs is at 1500 my second map is at 3000 rather then 2000revs third map is 45000 revs and so on.. so the unit is playing up.

A lot of headache to say the jb4 should be plug and play!!

I’ve had a look and can’t find any lead in the car so I’m at bit of a lose end with the problem.
Make sure menu 5 on the speedo is set to 2 on the revs for the 335 and do it by number of clicks rather than what the clocks say i.e. with the jb4 on, 5 clicks of the speedo button then zero the revs then 2 clicks up on the revs, hold both down buttons to save and exit command mode. It may be setup for the wrong car dials.

Have you scanned for a JB4 Bluetooth connection, it may be a Bluetooth version.
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