[tarrant64]

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:

[tarrant64]

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).

[IMG][/IMG]

[shawntech]

Torque limiting sets in after a few pulls, jb products don't work on this platform

[tarrant64]

Originally Posted by ls3c6

Torque limiting sets in after a few pulls, jb products don't work on this platform

I think the product "works", just not well. A flash would be optimized and best, no doubt, but I'm in the boat with many others right now where we can't flash it due to locked DME. So this is an inexpensive way to kind of explore additional boost the moment.

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.

[Fuel-It!]

Originally Posted by tarrant64

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).

[IMG][/IMG]

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.

[Fuel-It!]

Originally Posted by ls3c6

Torque limiting sets in after a few pulls, jb products don't work on this platform

There is no torque limiting that applies to the JB4, there are plenty of JB4 tune only B58s running low 11s.

[tarrant64]

Originally Posted by Fuel-It!

There is no torque limiting that applies to the JB4, there are plenty of JB4 tune only B58s running low 11s.

I don't doubt there a plenty of B58's running 11s. I think it's a mistake though to consider all B58's the same, the 2021 clearly being different with some modifications going into the mild hybrid system among other notable differences.

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+).

[shawntech]

Originally Posted by tarrant64

I don't doubt there a plenty of B58's running 11s. I think it's a mistake though to consider all B58's the same, the 2021 clearly being different with some modifications going into the mild hybrid system among other notable differences.

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+).

I tested my 20 with jb4 on dragy and the drag strip. The car is slower after flooring it a few times. There is stock calibration logic that slows the car back to and beyond stock. It's pretty irritating that fuel it being burger's cheerleader repeatedly undermines customers and users when they say it does not work rather than explain to us why it doesn't work.

[Fuel-It!]

Originally Posted by ls3c6

I tested my 20 with jb4 on dragy and the drag strip. The car is slower after flooring it a few times. There is stock calibration logic that slows the car back to and beyond stock. It's pretty irritating that fuel it being burger's cheerleader repeatedly undermines customers and users when they say it does not work rather than explain to us why it doesn't work.

I'm not undermining anything or cheer leading, but I've driven around in BMS' 2020 G20 M340 and done back to back runs in it. There was zero power drop off. And we've never had any drop off in our Z4 B58.

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.

[Fuel-It!]

Originally Posted by tarrant64

I don't doubt there a plenty of B58's running 11s. I think it's a mistake though to consider all B58's the same, the 2021 clearly being different with some modifications going into the mild hybrid system among other notable differences.

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+).

I don't know what the differences are between your runs but for metrics use your dragy and measure 60-130mph times or 1/4 mile trap speeds, for example. Try to match up starting temps/heat soak as well.

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.

[Patgilm]

Originally Posted by Fuel-It!

There is no torque limiting that applies to the JB4, there are plenty of JB4 tune only B58s running low 11s.

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.

[mike@x-ph.com]

Congrats OP, glad you like it

[Fuel-It!]

Originally Posted by Patgilm

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.

They usually also have an intake, sometimes a DP, usually on E85 mixtures. Factory plugs, catback, tires, full weight, etc, usually.

I don't usually take note of true "tune only pump gas" posts for the platform. Probably mid-high 11s?

[Patgilm]

Originally Posted by Fuel-It!

They usually also have an intake, sometimes a DP, usually on E85 mixtures. Factory plugs, catback, tires, full weight, etc, usually.

I don't usually take note of true "tune only pump gas" posts for the platform. Probably mid-high 11s?

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.

[tarrant64]

Originally Posted by Fuel-It!

I don't know what the differences are between your runs but for metrics use your dragy and measure 60-130mph times or 1/4 mile trap speeds, for example. Try to match up starting temps/heat soak as well.

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.

All good points, thanks for that feedback. Weather is pretty much the same, give or take 15-20 degrees, but cold is cold when it's <30 degrees outside lol.

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.

[M340i Pride]

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

[tarrant64]

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.

[M340i Pride]

Originally Posted by tarrant64

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.

I played around and tried many different settings. I wholeheartedly agree with you on the sweet spot being just slightly below max setting.

[russell21]

What is just below max setting 4:00 ?

[tarrant64]

Originally Posted by russell21

What is just below max setting 4:00 ?

Yeah, I think it's a bit of a grey area but that more or less seems to be a pretty good spot to place it.

[tarrant64]

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.

[VipinLJ]

Originally Posted by tarrant64

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.

A few people have been getting CELs with the JB+ recently (though on the B46 engine). Probably a defective batch? Did you contact BMS?