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07-02-2017, 03:02 PM | #1 |
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JB4 backend flash
So I've been running mhd flash tune on my car for the last couple months. I'm fbo right now running a 25% mix. I just looked up some posts and it says that having a jb4 paired with mhd would increase the reliability of the engine. Is that actually the case? If so, would my mhd flash maps be of no use? Thanks again
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07-31-2017, 07:31 PM | #2 |
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Bump. Interested in details/benefits in stacking MHD and JB4
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Current: 2018 M3 RIP: 2013 M6 Individual 1 of 2 750whp
RIP: Bagged & Boosted 135i FBO PS2 RIP: Stanced RSX-S https://www.clubrsx.com/threads/slam...entftl.851394/ |
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07-31-2017, 09:06 PM | #3 |
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Drives: 2008 BMW 135i (E88 N54 6AT)
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I've been swapping between E25 with the JB4 on BMS Race BEF and the MHD E25 OTS tune. With a FBO N54, I found the MHD tune had noticeable low-down pull that the JB4 maps don't. The MHD tune targets higher boost than the JB4, and didn't pull timing as quickly as the JB4.
After installing inlets+outlets, I found Map5 in the Jb4 with the race BEF to be much smoother than the MHD. That said, the outright performance of the MHD map was better (again, thanks to it targeting higher boost and pulling timing less, though the fear here is that the only way you get that is by being less sensitive to knock). I did a heap of 3rd gear runs with each tune, and have attached my best virtual dyno of both. In the end, I've dropped back to pump gas and JB4 map 2, because over my time playing with E25 - E40 I've found the limits of both my HPFP and LPFP. Long story short - from everything I've read, it's one or the other; your Backend-flash options are: 1) JB4 in gauges only mode (4/4) with MHD E25 Map (E25) 2) JB4 in BEF mode (4/2) with BMS RACE BEF (E25) 3) Custom tune (either with our without the JB4) All that said - if you do have the JB4 in gauges only mode, I found it would still drop to Map 4 if it detects a failsafe condition. (Of course, when you're in Gauges only 4/4, it doesn't make any difference to your tune what map the JB4 is in, as long as it's not zero). - So, if you stack your JB4 in gauges only mode and keep the gauges on the dash, you still get a small safety that people with no JB4 do -> Keep it on Map 5, and if you ever see it drop to Map 4, slow down and examine the logs to find out what's triggered it. Last edited by xQx; 02-13-2023 at 09:15 PM.. |
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08-01-2017, 09:02 AM | #4 | |
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Quote:
* No boost until oil (or is it coolant??) gets up to 180f * Gauge hijacking (pretty stupid "feature" in my opinion that #1 can't accurately be read and #2 messes with your ability to see your oil temps and fuel levels lol) * JB4 adds ability to run meth/pi/secondary fuel pump setup * Instantaneous map switching via steering wheel controls (I would argue that this is not as straightforward as people want you to believe it is. JB4 does still require other settings to be fine tuned when you change maps/boost. Also, if you have a back-end flash the DME tables have been re-scaled to work with a more aggressive boost curve than the base JB4 maps. You end up relying on DME table "overhead" or "safety net" when you start changing load/boost too far from the curve the DME expects to see. Most JB4 users are content with having several degrees of timing corrections across an entire pull. DME is pretty robust in its ability to remove timing when the boost curve is too aggressive for the given octane. Flash tuning aims to dial in timing for the given fuel and boost so that these corrections never occur in the first place.) * Bluetooth logging (JB4 logging is not nearly as extensive as MHD though so its more of creature comfort than actual benefit) * Shift lights in-dash using the turn signals * Other "features" that you can find yourself on BMS website that mostly entail things that are really only necessary to make the JB4 device itself user friendly. And as a side note, there are no performance gains to adding on a JB4 device (see above how JB4 can be used as a boost controller but there is a limit to how far you can adjust things before the DME runs out of overhead to compensate). The only thing it's good for after already being flash tuned is for its can-bus features and its ability to control a meth/pi/secondary fuel pump setup. Last edited by bNks334; 08-01-2017 at 09:17 AM.. |
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09-05-2017, 07:27 AM | #5 | |
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Quote:
https://youtu.be/fQ39N2SpPMc |
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09-05-2017, 10:06 AM | #6 | ||
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09-06-2017, 01:03 PM | #7 | |
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In my very biased opinion, the jb4 is the best. And anyone who disagrees has either never used it, or doesn't know how to use it properly. It is a finicky tool, and it is high maintenance. You have to play with it a bit. But it has been very good to me. Most of the craziest n54 builds have a jb4. Not all, but many of them. Happy tuning!! Last edited by E9xjake; 09-06-2017 at 01:10 PM.. |
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09-06-2017, 04:27 PM | #8 | ||
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04-06-2023, 09:05 PM | #9 |
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335xi BEF HELPPP
Im new to joining the forum. I got my 335 a little over two years ago. Ive had a lot of work done and finally did the JB4. I am now going to do the BEF. I need help finding which exact BEF I need to use for my car. Can anyone help me please? I also have a few other questions on some of the settings. Ive done a bunch of research but some things I still can't find. I own a construction company and early have time to even wipe my own ass. All my spare time goes into my car. I love this car and am so happy I did the purchase. Even though I keep spending all my money and it keeps going back to the shop it is all worth it.
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04-07-2023, 10:15 AM | #10 | |
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The template file downloads are at the bottom of the first post. https://www.jb4tech.com/forum/model-...aps#post820731 |
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04-08-2023, 12:37 PM | #11 | |
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04-08-2023, 01:17 PM | #12 | |
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04-08-2023, 03:12 PM | #13 |
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BEF JB4 N54 2008 335xi
It’s a 2008 335xi
I actually found it i think by going to MHD and reading the codes i didn’t realize it said it there. It said its IjE0S So next question. To flash MHD BEF i need to put jb4 in map 0 then which one do i choose. Im just using pump 93 right now but there is regular pump then there’s PUMP_USA then PUMP_USA_SCALAR. Also do i go to 4/2 before i flash or after? One more question. Then onces i put it in 4/2 for BEF do i then hit the volume down button all the way to 0 then change the map again or..? By the way thanks for replying |
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04-09-2023, 02:23 AM | #14 | |
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I’ve personally always used the pump USA file. |
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