11-07-2022, 04:19 PM | #23 | ||
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There is one guy who has had universally positive feedback from both BMW and Supra communities regarding smooth power delivery and safe performance optimization as far as it goes on the JB4. Not cheap at all but it's the way I would have gone if I were to get JB4. I'm at the point now where I will likely be shipping my ECU to Femto for the unlock instead
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11-08-2022, 05:04 PM | #24 |
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I just talked to burger motorsports with the question of over boosting with the jb4 piggyback. I told them I was running the jb4 on map 2 with the aa catted downpipe. Under these circumstances I was told as long as the electronic waste gate was hooked in overboostng would not be an issue. This setup is on my 2022 M 240I.
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11-12-2022, 08:39 AM | #25 | |
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11-12-2022, 02:36 PM | #26 |
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RE: post 19 of this thread.
To me that transcript of emails is fairly meaningless. there is no discussion of JB+ boost relative to recommended octane for relative boost setting. Keep in mind there is a range of Prem octane in US from 91 to 93, and there is a range of settings available with the JB+. Frankly i would not run JB+ at max setting with 91 octane. |
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11-12-2022, 03:29 PM | #27 | |
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The fact fueling was not discussed makes the transcript even more meaningful as it shows the JB+ is safe and marketed in all 50 states, where 93 is not always available. Like you, I also would not use 91 on max setting, just to be cautious, but then again I wouldn't use max setting with 93 either. I'm pleased with the default setting, which I run with E30 on 93. |
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11-23-2022, 09:53 AM | #30 | |
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11-23-2022, 12:25 PM | #31 |
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11-23-2022, 12:51 PM | #32 |
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03-03-2023, 08:30 PM | #33 |
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I never knew map 3 could be an issue. I have been running map 3 on my M340 as a daily driver for almost 3 years. I don’t drive that much but I have put 13K miles on it under map 3 with zero issues. Why is that problematic? I just ordered an M240 so I am trying to see about moving my JB4 over and trying to learn thanks!
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03-08-2023, 08:32 PM | #34 | |
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Since then, I have also heard from one M240i driver who is on replacement turbo #3 (or 4) and has been running map 3 the whole time. I know better than to definitively attribute anything to one factor when there’s also people like you who haven’t had any problem. At the same time, map 3 seems to be a common variable amongst those who have blown their turbos while running JB4.
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03-08-2023, 08:38 PM | #35 |
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Interesting. My M340 is a lease I am buying the M240 so I think I’m going to play it safe and run map 2.
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03-08-2023, 08:42 PM | #36 |
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Based on this thread, running map 4 is generally recommended over map 2 since it has an absolute PSI target rather than the additive PSI that maps 1-3 utilize. There’s quite a lot of people that have been running map 2 regardless but just something to keep in mind.
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03-09-2023, 12:03 PM | #37 | |
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03-09-2023, 12:51 PM | #38 | |
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Read the first page of the thread for more information on all of this.
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03-09-2023, 12:53 PM | #39 |
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03-09-2023, 03:28 PM | #41 |
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Data log,make sure fuel trims aren’t maxed and see if timing is being pulled. More timing > Less boost.. That’s the smartest way to pick a map. I’ve tried every map on 93 and E30 and they all pulled timing,some much worse than others. Terry set me up with a map 6 and it pulled so much timing it fell flat on its face lol
Map 2 on E30 is the strongest map with the most timing(for me anyways) 11.3@123mph is my best so far. All testing done with a dragy and data logging,no guessing. Jesse is the only guy I would trust if you want a custom map to make more power safely. If you are inexperienced or want to learn more about logging,fuel trims etc..Do some research on JB4Tech - https://www.jb4tech.com/forum/model-...ussion/b58-b48 Last edited by Value; 03-09-2023 at 03:45 PM.. |
03-09-2023, 04:11 PM | #42 |
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So what maps do you recommend to run on 93 octane?
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03-09-2023, 06:38 PM | #43 |
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03-09-2023, 07:36 PM | #44 |
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Curious if map 4 might be more viable on 93 octane if you live at higher altitude?
If im daily driving my car, I don't necessarily want to be forced to go out of my way all the time to mix ethanol since there aren't a ton of gas stations around here that sell it. |
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