[G_B58]

I haven't had any doubts about the effectiveness or reliability of the bms products, for the jb+ it was more so about the pay off vs risk of warranty loss. I figured if I got the jb+ I'd have my fun and work my way up to jb4, rather than jumping right in and then wanting more anyways.
So your running map 5 with the stock downpipe? I thought anything past map 2 you need catless/high flow?

[GD1981]

Yes, I’m running Map 5 with stock downpipe. As long as your fuel is right (E85 mix) and the EWG harness is connected, you can safely run Map 5. That said, I worked myself up to Map 5, meaning anytime i tried a new Map, Id log a few runs and then have the Burger guys evaluate them.

[G_B58]

Map 5 is only for e85 mixes?

[VipinLJ]

Originally Posted by G_B58

Map 5 is only for e85 mixes?

Ideally yes. Else there'll be a lot of timing pulls that can be harmful to the engine, especially on 91 octane. Probably even on 93. So it's ideally ~E25-30 or 93 with a good octane booster or race gas.

[G_B58]

Ya, I can't get e85 around here, so when I was on mhd before I'd use 93 with race gas to boost it to 95.

[GhostMajor]

Considering stock we're doing 0-60 in 4.1s, the results from the JB+ are pretty meh....not gonna lie.

Did you try to lower boost ? Adding boost without having the proper fuel will actually slow the car instead of making it faster.

Pretty sure you're on 91oct...Using octane booster or getting 93oct+ would gives better results if you're trying to run more boost!

Hopefully that'll help!

[rrfitness20]

So is the sweet spot for the JB+ at max setting?
I've read that maxing out JB+ is similar to JB4 map 1. Can anyone confirm ?

[VipinLJ]

Originally Posted by rrfitness20

So is the sweet spot for the JB+ at max setting?
I've read that maxing out JB+ is similar to JB4 map 1. Can anyone confirm ?

Yup. JB+ max is around 4-4.5psi over stock? JB4 map 1 is around 3 psi over stock iirc. But JB4 feels smoother.

[ssgm1x]

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.

I have a 21 M340ix and have had the JB4 on it since day one with zero miles on car. I now have about 900 miles on car and all is good. No check engine lights. Everything runs smooth. I usually keep it on map 2 or map map 3.
I'm supposed to be going down to the Dragstrip soon to see what this car can do. I will probably run it on E20-E30 fuel on JB4 map 3 or 4. Car only has an MST Intake and rest is stock.

[sugarloafer90]

Hey tarrant64, were you able to clear the the 101F01 error code? I installed the JB+ and after 10 min my check engine light came one and has stayed light despite removing the JB+ and driving the car. I also tried Bimmerlink which allows me to clear other errors, but not this one. Hoping to avoid going to the dealer for this one if possible. Thanks in advance

[TruthOne]

JB4 or race chip Black GTS? Which is better?

[G_B58]

Originally Posted by TruthOne

JB4 or race chip Black GTS? Which is better?

From my understanding, Racechip is a more plug and play beginner friendly solution, where as jb4 has more tuning potential with a lot of safety features but still could be a problem if u don't follow the guidelines.

[LongBeachDinanFan]

Originally Posted by TruthOne

JB4 or race chip Black GTS? Which is better?

RaceChip is like JB+ discussed in this thread, JB4 is another league more comparable with flash maps.

[blu_g20b58]

Tried JB+ on 2021 M340i, was not a fan. Car didn't drive or shift as smooth as it used to. Also, pops/burbles (which I already had a minimal amount due to being 2021) disappeared almost entirely. Ending up returning it.

[ssgm1x]

JB4 on an otherwise stock 2021 M340ix running 93 Octane on just Map 3.
I ran 11.75 sec. 1/4mile (left lane)

[Punkwrock]

I just got a 2020 M340i and had still have the JB+ plus i was running in my 2020 330i. I installed it in my M340 and have it set at 3 o'clock. I noticed good torque gains in the bottom end but after 100km/h the car is sluggish compared to stock so i removed it. I can only get 91 octane in my area but was wondering if anyone tried other settings on the JB+ @91 to maximize power gains and not lose any top end power? Even my HP/TQ gauges show a loss of power at the top end compared to stock on my dashboard.

[Sirok]

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.

I have a 2021 with catted dp running jb4, ewg, 93 and e30. 1/4 mile is 11.2-11.3

[Patgilm]

Originally Posted by Sirok

I have a 2021 with catted dp running jb4, ewg, 93 and e30. 1/4 mile is 11.2-11.3

The original claim was a tune only would run low 11’s and I just don’t see it. What you have on your car is more than just a tune.

[G_B58]

Originally Posted by Patgilm

The original claim was a tune only would run low 11’s and I just don’t see it. What you have on your car is more than just a tune.

That's actually a piggyback tune which is less effective than a flash, so low 11s is amazing. Or are u referring to someone reaching that level without any bolt ons?

[Patgilm]

Originally Posted by G_B58

That's actually a piggyback tune which is less effective than a flash, so low 11s is amazing. Or are u referring to someone reaching that level without any bolt ons?

Yes tune only, no other bolt ons. Literally just a tune, that’s it.

[Lonmon]

I don't know who's tune is reliably getting bottom 11's tune only. I have intake and catless downpipe. I have had 4 different tunes. Local tuner OTS e30 stage 2, local tuner dyno tune stage 2+ e50, Bootmod3 OTS stage 2 e30, and Mission Performance stage 2+ e50. I have dragy tested all of them repeatedly in weather from 30* to 80* in the same level spot. None of them have done better than 11.36 with the above mentioned mods. With a little better 60ft it could have been a tenth or two lower but that is with mods and very little fuel in the tank on a 30* day. Typical results were 11.50's. Still great results for not much more than a tune but lets keep it real.

If a jb4 can reliably create bottom 11's with not much else on e30 then I waisted a lot of money. Lol! When I tried the JB+ it felt like the car fought it and felt like stock after running it awhile. No testing honestly, just my feeling. I never bothered since I had the tuning scheduled and the jb+ was just a temporary "fix" for my need for more. The JB4 with ewg wires is certainly better than the + with a lot more adjustability however I would like to see multiple back to back runs to see if performance drops off substantially as the dme "learns" what is going on. If someone could show that the performance from the JB4 is not just "glory run" capable that would be important to know for those debating on whether a tune would do much more for the money.

[G_B58]

Has anyone tried Dinans e85 tune? They claim 502who and 539 ft/lbs, with nothing but their axleback.
How much power would a jb4 be putting down with just e30?