01-30-2021, 11:13 AM | #1 |
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2021 M340i w/ JB+ (max setting)
Bought my first Dragy last couple of weeks. Pretty cool device, thought I'd share some captures a run of my 2021 M340i w/ JB+ (set to max).
The car really does seem to "wake up" with the JB+. For the money, it's actually fairly good gains from what I've seen on other platforms. Can't really complain for $200, especially with an upgrade route to a JB4. I made some comments earlier, about low end throttle response seeming 'off' with the JB+, I take all of that back. I did gut check that, remove the JB+, and it drove exactly the same even after a couple days. I will say, the power band is really good with the JB+ below ~90-100mph. Above that, the car is slower in my opinion. Noticeably so (just compare the 60-130 HP/TQ meters in the videos). M340i xDrive - Stock w/ JB+, P7 All Seasons (<30 degrees outside): Here is a 60-130mph pull with JB+: 0-60mph w/ Launch Control + JB+ (sorry no audio, not sure why): 1/4 mile run (sloppy start) - 12.85s For comparison, stock 60-130mph and 0-60mph pulls: Last edited by tarrant64; 01-30-2021 at 11:36 AM.. Reason: added content |
01-30-2021, 01:27 PM | #2 |
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By the 3rd run, back to back to back, the car seemed to pull a ton of power and was noticeably slower, presumably heat soaked (weird given how cold it was).
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01-30-2021, 02:29 PM | #4 | |
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I agree with you on the torque limiting, came in hard after multiple pulls. Not something the JB+/JB4 can really compensate for or change the behavior of. I'll be doing all the runs again (stock) weather permitting over the next week. |
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01-30-2021, 04:29 PM | #5 |
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That's normal with the factory heat exchanger. The intercooler is air/water so the water heats up during back to back runs resulting in higher inlet temps. They make upgrades for them but for a tune only car letting it cool down a minute between runs will help greatly.
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tarrant64116.00 |
01-30-2021, 04:31 PM | #6 |
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01-31-2021, 09:49 PM | #7 | |
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Ran some comparisons, and still not sure really if the JB+ will have any positive light shed on it on a Dyno for the '21 B58. Put together a couple of clips (of several I have from stock and now with JB+ maxed), and it's slower with JB+. The butt dyno says the JB+ is doing something, but once you really get going it's a different story (80-100+). |
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01-31-2021, 10:02 PM | #8 | |
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01-31-2021, 10:19 PM | #9 | |
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At best case you could say something isn't working for YOU for some reason but when you start making general statements like it's not working for anyone then that is where it gets a little ridiculous as there are 100s of 2020+ models running it successfully. Post up your JB4 logs if you want me to help you evaluate them. Note which log had it running "faster" and which "slower" so we can see what the difference is exactly. Last edited by Fuel-It!; 01-31-2021 at 10:24 PM.. |
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01-31-2021, 10:21 PM | #10 | |
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It's certainly possible you'd be quicker with the JB+ set at 50% or 75% rather than 100%. If you push boost too far without sufficient octane you'll wind up with some timing pull. Given what you're describing timing pull seems like the most likely culprit. One of the limitations of the JB+ is it can't provide any performance metrics or data. With a JB4 you'd want to look at boost, timing, air/fuel ratio, throttle position, intake temps, etc, to evaluate the differences and see what is and isn't work for your specific situation. |
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ssgm1x418.50 kamaleon_m34014.00 |
01-31-2021, 11:14 PM | #11 |
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Are you saying just a JB4 tune and nothing else (e.g. stock downpipe, pump 91-93, stock spark plugs, stock air filters, stock exhaust, etc.) that there are plenty running low 11’s? When I think of low 11’s I’m thinking 11.1-11.3. That’s a lot of time to shave off with just a tune and nothing else.
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02-01-2021, 09:59 AM | #12 |
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Congrats OP, glad you like it
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02-01-2021, 11:15 AM | #13 | |
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I don't usually take note of true "tune only pump gas" posts for the platform. Probably mid-high 11s? |
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02-01-2021, 12:34 PM | #14 |
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On my dragy on pump 93 my best is around 11.7. I’m likely going to add a catted downpipe to see what I can shave off and see if I can get the mph a little better. I’m trapping sound 117-118mph.
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02-01-2021, 01:32 PM | #15 | |
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I made mention of that before I think elsewhere, that I think the car may be faster with the boost turned down. I'll be doing some more runs for sure though. Of the pulls I did do, the one where I still managed a 12.8x while having the crappiest start imaginable - I'm pretty sure that was best case scenario and had it been a clean launch, easily low 12s if not high 11s with a high 3.8-9x 0-60mph. Overall, to be clear, there are gains over stock with the JB+. It does, in fact, work. I think a stock dyno showing vs JB+/4 or Dragy times (what I'm doing now) - is going to paint a picture how "well" it works, but for $200 the JB+ is not worthless, it's not pointless, it does increase power via boost - and for the money you can't really do better. I'm merely posting up my findings as I give this a try, and I may find I graduate to a JB4 for better results. |
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02-08-2021, 01:07 PM | #16 |
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I wrote a detailed experience here on the forum back when I got my JB+ about 5 months back... Just wanted to chime in, that for me personally, it made a noticeable difference in the power.
I did multiple things to see how it is on different settings, etc, and i felt the kick on of the boost more with JB+ on than stock for sure. Best setting was ALMOST MAX BOOST, but not at max. (i think 4'o clock instead of 5'o clock) Is it faster on dragy?? No way of knowing because I never did any timed runs but it sure feels faster ha Last edited by M340i Pride; 02-08-2021 at 01:14 PM.. |
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02-11-2021, 10:57 AM | #17 |
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As I said I would, Continuing to test different boost settings with JB+. I'm at the halfway boost right now and actually threw a code today. On highway to work check engine light came on this morning.
CODE 101F01 - Intake Pressure Absolute - too high I suspect this could be due to extreme cold weather right now, but I wasn't even "on it" today, casual drive doubt even past 2-3K RPM. It's about 1-2 degrees F currently. Car wasn't even warmed up so no reason to beat on it especially if it's slick. I removed the JB+ for now, and will drive around more later to see if the code returns. Not a good thing to see though either way. As far as drivability with at the midway point in the JB+ - it's just ok. It's not great and shifts are rough. Stock is a better experience. The sweet spot right now seems to be between the midway and max. |
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02-13-2021, 04:45 PM | #18 | |
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02-13-2021, 07:02 PM | #19 |
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What is just below max setting 4:00 ?
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02-15-2021, 09:04 PM | #20 |
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04-01-2021, 07:02 PM | #21 |
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Well I put the JB+ back in (at position 3/50%) after having it stock for a bit and it seems after awhile it just throws the check engine/code again.
My guess is it won't matter what setting I have the JB+ set at - something with the '21 motor after awhile learns that it's off and refuses to be ok with it. Car still drives fine, just throws a code. Honestly annoyed with it and it's keeping me from upgrading to something like the JB4, because there isn't really any ability to tell the ECU not to freak out. Not really sure what my options are, but going to search around see if any others with a 21 are having the issue. |
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04-01-2021, 09:20 PM | #22 | |
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