09-14-2020, 10:10 PM | #1 |
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Jb4 worth it.
So first bmw and it’s a 20 m340 love the car just would like to be in the 11s . The car is a lease so there’s that . I’m leaning towards the jb4 for the simplicity and safety compared to tuning their car .
Will I notice a big difference from stock to the stage 2 jb4 map? Thanks for any input new to bmw period come from tuning 5.0 mustangs which were bullet proof on tune only |
09-15-2020, 07:25 AM | #2 |
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In my experience, and I've had both products on cars in the past. The car just runs smoother and better with a flash tune. There's also the fact that it makes more power with a flash tune. My opinion is that having the computer that was designed for the car do all the work is better then using an external controller. Again thats my opinion though. I dont think you will be disappointed with the extra power from either one.
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09-15-2020, 11:59 AM | #4 |
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The JB4 is the go-to tune for any car that is leased or under warranty. Can't do quite as much as a full ECU tune but gets you close and offers a lot of great features too like CANflap, boost by gear, on the fly map changes, E85 support, and others.
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09-16-2020, 09:42 AM | #5 | |
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09-16-2020, 05:15 PM | #6 |
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Hey Mike, are there flash tunes available for the 2021 model 340xi yet? I know the DME has to be sent in for the 2020 so I am guessing its the same for the 2021 if its available. Do you know if they are tune-able yet?
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09-16-2020, 11:12 PM | #7 |
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I tested jb4 at the drag strip, map1 was same as stock and map2 was 4mph and 4 tenths slower than stock.
It doesn't work on this platform, flash is required I suspect due to torque limitation. |
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09-17-2020, 10:21 AM | #8 | |
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As long as you are okay with sending the DME, you should be able to get the 2021 flashed
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09-18-2020, 04:17 AM | #9 |
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Same even map 5 wasn’t really quicker then stock car, the jb4 on this platform is pretty subpar
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09-18-2020, 05:41 AM | #10 |
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09-18-2020, 11:59 AM | #11 | |
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It's not possible for a map to go slower unless you're riding some sort of octane limitation or have something set dramatically wrong. Our last JB4 Z4 dyno: |
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09-18-2020, 03:56 PM | #12 | |
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2015 Honda Civic Si // FBO + Hondata // Retired
2017 340i // FBO + BM3 // Retired 2020 M340i // Stage 2 // Retired 2021 X3M // RGSport Midpipe + MSS + RaceChipGTS // Retired 2016 Rav4 |
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09-18-2020, 07:35 PM | #15 |
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Hope that helps :-) Fuel-It originally posted that information in their post from February regarding this run. It can be found here. Also some good info on results on Map 1 vs 2 and 91 pump gas. https://f30.bimmerpost.com/forums/sh....php?t=1692979 Last edited by chenry; 09-18-2020 at 07:48 PM.. Reason: added link |
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09-18-2020, 08:31 PM | #16 |
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has BM3 put out a tune for the M340i?
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2015 Honda Civic Si // FBO + Hondata // Retired
2017 340i // FBO + BM3 // Retired 2020 M340i // Stage 2 // Retired 2021 X3M // RGSport Midpipe + MSS + RaceChipGTS // Retired 2016 Rav4 |
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09-18-2020, 11:45 PM | #18 | |
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Map 1: +28 wheel horsepower vs stock wheel horsepower Map 2: +35 wheel horsepower vs stock wheel horsepower So noticeable difference? Sure. Worth the money? Up to you :-) Last edited by chenry; 09-19-2020 at 10:47 AM.. Reason: typo / and reworked a sentence |
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09-19-2020, 10:42 AM | #19 | |
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