03-29-2017, 05:09 PM | #1 |
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JB4, which map recommended? 440i (B58)
Hello Wonderful People,
I just installed jb4 in my new 440i. I was wondering what map would be best to use for this completely stock car? I am running on octane 91 but will switch to 93 soon. Any suggestions please? Thanks 🙏 Last edited by SikhM4CS; 05-09-2020 at 10:34 AM.. |
03-29-2017, 05:56 PM | #3 |
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Yes map 3. At least until you can run 93 octane then you can run map 1... or map 2 if you're feelin ballsy or add a downpipe.
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03-29-2017, 08:01 PM | #4 |
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03-29-2017, 08:15 PM | #5 |
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No that's map 7. Map 3 is a less aggressive version of map 1 intended for people with less than 93octane fuel, or those only looking for a moderate power gain less than what map 1 has to offer. Map 2 is more aggressive than map 1 intended for those running higher octane and/or a few boltons. There's a full map guide on the n54tech forums.
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03-31-2017, 09:34 AM | #6 |
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Map Guide as of v4 firmware below:
Map 0: Disable JB4 all together Map 1: Suggested performance map Map 2: More aggressive than map1 for bolt on mods and higher octane fuels or octane booster, currently in BETA testing Map 3: Less aggressive than map1 intended for use with lower grade fuels or customers looking for less of a performance increase. Map 4: Stock tuning with CANbus active for logging and diagnostics Map 7: Water/Methanol Injection map |
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04-04-2017, 05:51 PM | #7 |
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As mentioned map 3 until you start using 93 octane
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04-04-2017, 08:23 PM | #8 |
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07-30-2017, 09:06 PM | #9 | |
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07-31-2017, 07:10 AM | #10 |
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they are not the same now.
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08-01-2017, 03:54 PM | #12 |
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Drives: 440 xi MPPSK JB4
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440 MPPSK also..
I use MAP 6 with a PSI setting of 3 up to 5k then taper to 2PSI - So far thats the best config for me.. And believe me I have many logs to show the results... I posted up some charts / graphs comparing all the settings on the N54 forum. Even Map 1 doesnt run all that well - No idea why since it peaks at 3psi. Map 6 seems to run the smoothest with the most power. Anything more than Map 1 or Map 6 (with appropriate settings) requires E85 as 93 octane is not enough to support such high PSI a stock MPPSK delivers Plus the JB4.. |
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08-01-2017, 06:56 PM | #13 |
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Stock except for mppsk
Yes sir ... everything else set to the defaults ... On,y way I can keep timing ...that said I still hit 18 psi some times with an average of 16.. I have experimented with every map... even absolute targets of 17psi... Seems additive 3psi up to 5k on map 6 is best.. 17psi flat on map 6 was next best.. Map 1 to 3 is horrible ... never tried map 5 - not willing to risk the motor |
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08-01-2017, 08:25 PM | #14 |
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08-02-2017, 09:03 AM | #15 |
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They are completely different... JB+ only controls boost based on Manifold pressure..
The JB4 controls boost based on many other factors that I am not entirely aware of but probably more than 30 or 40 data points. I have a JB4 and my friend has a JB+. He has odd shift behavior (sometimes) and I dont (mostly). The car no matter what will not drive nearly as smooth but I guess it depends on how much you can tolerate. I cant tolerate much thus the JB4 I am very happy with. To add to above - The JB4 has the ability to monitor timing - which is a key component of making power. The JB+ isnt even aware of timing. The DME in theory should be mindful of timing related to boost but all it will do is retard the timing to save the motor from a knock - thus you will lose power no matter how much boost you add without the proper level of Octane. With the JB4 you have the ability to see this in the logs and make a conscious decision to scale back the boost (even at a specific RPM) to gain more timing - Low Octane and High Boost is the culprit of timing retard. Boost is not the end all of performance... A good balance between advancing of timing and boost together yields performance gains. You can run 19PSI but if the motor is retarding timing (not advanced) you in fact could be 1. Putting your motor in a position for knock and 2. Significantly lower performance. In fact my tests have shown for my fuel quality (93 octane in NY) lowering boost yielded some higher timing with improved performance. Lastly in light of the above, I will for a stock B58 on 93 octane 4lbs of boost will yield some nice gains.. Both with the JB+ and the JB4. You cant go wrong with either.. - but just know there is a significant difference between the two; Logging isnt the only benefit of the JB4 If you have the MPPSK - My advice would be completely different - I honestly could only recommend the JB4. |
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08-02-2017, 12:02 PM | #16 |
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Since you have the MPPSK I will give you some info to support my statement (since I will get flamed by those who have no clue anyway)..
I have probably taken at least 20 - 30 logs and analyzed them. Even identified a way to determine which map is performing better.. Maps 1 - 3 perform (maps 2 and 3 with diminishing returns) well however has horrible drivability IMO. You either have odd shifting and/or hesitation (feels like a miss)... Inconsistent performance - Not JB4 fault but the DME changes as the environment changes (temperature, Fuel Quality, etc.)... Some can tolerate it... But I cant.. Map 6 which allows you to customly tune by RPM thats perfect IMO. JB+ im afraid would be worse than Maps 1 (lowest PSI added ) with having the MPPSK and forget about Maps 2 and 3. The MPPSK is already adding 2 - 3 PSI above stock... An additional 3 or 4 PSI will yield poor drivability and/or reduction in performance due to timing being retarded. Of course you can fix this with some e85 but again, you shouldnt do that unless you can monitor Trims and AFR .... Thus the reason why I could not recommend the JB+ for MPPSK - JB4 is truly needed if you want performances and drivability.. My suggestion is to get the JB+ now and see if you like it.. If you dont then you can always upgrade to the JB4 through an upgrade program Burger has. They apply what you spent on the JB+ towards a JB4. |
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08-02-2017, 02:21 PM | #17 |
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Not trying to strike a debate between tunes or piggy backs but I have a Dinan Sport which essentially is the exact same as a JB+ and I have zero shift weirdness. The only two items to note were to first 30-40 miles had some odd surging at low RPM's until it adapted and you get a touch slower shifts at redline with the torque limiting coming into factor at times (manual mode is virtually identical shift speeds). I run 92 octane and on the Sport +3psi setting and it's a very noticeable difference and runs very smooth.
However, my only complaint I can say is stock form the B58 feels so linear it almost feels like it lacks a turbo and with the Piggyback you feel the boost come on aggressively at the low end creating that torque surge reminiscence of a turbo engine. From a drivability standpoint this is where a JB4 tuning the boost curve to create a linear powerband would be beneficial. Other than that every single piggyback thus far has some issue in regards to the B58. Dinan, JB+, JB4, AA, etc. all have drivability complaints, torque intervention, etc. JB4 probably has the best chance to cure this with access to the CANBUS but until then it's almost impossible to say especially considering BMS is on firmware 7 or 8 in a pretty short time? Check the N54Tech B58 forum to see the latest map guide as it's recently been changed with their latest firmware release...they seem to be dialing the aggressiveness back. Personally I would buy just a JB+ or Dinan Sport and hold out until ECU access comes around or get MPPSK. None of the Piggybacks have 100% OEM drivability and that's just life for the time being. Last edited by dereksM3; 08-02-2017 at 04:05 PM.. |
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07-06-2018, 05:35 PM | #18 |
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Would like to see if anyone knows when the latest software update was done on the b58 jb4. I just installed one in my 340i with MPPSK and intake. Trying to figure out the best map when running 93oct.
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07-07-2018, 02:14 AM | #19 |
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i,m running just map 1 , and i love it, no lag at all, and a nice boost over stock. planning for a catted downpipe and switch to map 2.
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07-07-2018, 08:20 AM | #20 |
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Is it ok to run map 2 with jb4 on a completely stock 340i b58 engine?
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07-07-2018, 10:13 AM | #21 | |
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