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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications JB4 on 2021 M340i

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      11-27-2020, 03:32 PM   #67
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Quote:
Originally Posted by Vmaxx View Post
Interesting. Is there anything showing examples of how to route this?
I've routed it via the door jamb. And while the cable is visible, it doesn't bother me or anyone else. Best part is ease of install. Takes less than a minute.
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      11-29-2020, 09:17 AM   #68
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I don't have a b58, but same thing happened on my n20. It was as fast as anything out there to 40, then it fell flat on its face. I always thought the small engine/turbo was the culprit. I took it out after 6 months. Decided to go back to stock and use it for what I bought it for. Daily high mileage highway use.
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      06-20-2021, 08:56 PM   #69
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Quote:
Originally Posted by GhostMajor View Post
I'm waiting on an answer from Terry on the n54 forums since I'm getting the same time on the 1/4 mile on map 0-1-2-3.

My time is 12.1s every run.

I'm driving a m340i 2020 xdrive.

Hopefully he can figure out what's wrong, because based on current result it was really disappointing.
whats your 1/8th time ET and trap mph?
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      06-21-2021, 03:52 PM   #70
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Originally Posted by GhostMajor View Post
7.783 1/8th
113.49 mph
Sorry.. should’ve specified... what was your 1/8 mile trap speed?

Just for comparison, I’m RWD, and my 1/8 was 8.05@92.13 mph.
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      06-22-2021, 01:45 PM   #71
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Originally Posted by GhostMajor View Post
Oh yeah sorry. I'm Xdrive.

1/8 was 7.78@88.80 mph
Are you on 93 or 91? In any case, I wouldn’t go passed Map 2 without consulting with Burger and his crew first. I saw a bit of an improvement on Map 2 and 93 octane (when compared to stock) according to dragy. I have since added some e85 and mixed it with 93 for an E25ish mix and then bumped up to Map 3 - the car def pulls harder. With a full gas tank, I attempted to do a 1/4 mile run the other day (88 degrees and humid), but had to abort at the last few seconds, I was still however able to run 12.3 with a crappy 2.05 60-foot. Based on 1/8 mile, I reckon my 1/4 trap speed wouldve been around 117mph.
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      06-24-2021, 10:23 AM   #72
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Originally Posted by GhostMajor View Post
I'm on 91. Contacted Terry and I'm running map 5 for now.

They are making me play with the wastegate setting to try to investigate what is going on.

I should receive my draggy early next week to be able to compare without having to go to the drag strip everyday.

To be honest they are helping me and providing support but the plug and play click on map 1 or 2 and you're set JB4 is advertising for, we're far from that.
Agreed, Map 1 I didn’t feel like much. Map 2 did make a difference to me according to dragy....but the substantial difference was realized once i mixed in some E85 juice and then bumped up to Map3. I’m planning to install a DP and an EWG connector in the coming days which also should see a substantial gain.

Unfortunately for us 2021 guys, its the only route(for now) we can take in terms of tuning.
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      07-05-2021, 02:10 PM   #73
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Quote:
Originally Posted by GD1981 View Post
Agreed, Map 1 I didn’t feel like much. Map 2 did make a difference to me according to dragy....but the substantial difference was realized once i mixed in some E85 juice and then bumped up to Map3. I’m planning to install a DP and an EWG connector in the coming days which also should see a substantial gain.

Unfortunately for us 2021 guys, its the only route(for now) we can take in terms of tuning.
Exactly..People running the higher jb4 maps like 3 and up need to be adding octane in order to get full effect of the extra boost pressure. 91 or straight 93 octane with the added boost will probably cause ignition timing to be retarded, especially in hot weather. I run a jb+ maxed out which would kind of be like in between map 2 and 3 on jb4 at 4.5psi over stock. I also run a E85/93 mix, around 96 octane and the car runs great. Pulls hard to redline and traps 117mph in the 1/4. Wish I could run 2psi more for 120mph traps. Might trade the jb+ in on a jb4

Last edited by cjpp78; 07-06-2021 at 08:44 AM..
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      07-05-2021, 06:06 PM   #74
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Quote:
Originally Posted by cjpp78 View Post
Exactly..People running the higher jb4 maps like 3 and up need to be adding octane in order to get full effect of the extra boost pressure. 91 or straight 93 octane with the added boost will probably cause ignition timing to be retarded, especially in hot weather. I run a jb+ maxed out which would kind of be like in between map 2 and 3 on jb4 at 4.5psi over stock. I also run a E85/93 mix, around 96 octane and the car runs great. Pulls hard to redline and traps 117mph in the 1/2. Wish I could run 2psi more for 120mph traps. Might trade the jb+ in on a jb4
That’s my goal, to trap 120+ mph in the 1/4 mile - I’d like to nip at the heels of a G80

Going to the track once I install the AA DP and Dinan CAI.. hopefully I get to that level of power
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      07-10-2021, 06:40 AM   #75
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Here are some 1/4 mile Dragy times. My current setup is a 2021 M340i RWD + JB4(Map 5)+ E30. One of the runs was with LC (the better 60’) and the other one without. That said the run that I ran a 12.17 1/4 mile, had to be aborted at the very last split second - I really believe I couldve cracked a 12.0X @ 118.XX

Note: Car had about 3/4 tank gas during the runs
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      07-10-2021, 11:12 AM   #76
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Are u getting alot of tire spin off the line?
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      07-10-2021, 03:53 PM   #77
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yea..decent amount of wheel hop/spin
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      07-10-2021, 05:28 PM   #78
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Don’t forget d/a plays a huge factor
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      07-10-2021, 06:49 PM   #79
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Originally Posted by Antec800 View Post
Don’t forget d/a plays a huge factor
Yep. 330’ 70 degrees, not sure of humidity, but it felt kind of humid
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      07-10-2021, 09:10 PM   #80
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Quote:
Originally Posted by GD1981 View Post
yea..decent amount of wheel hop/spin
Can you get it to hook on a prepped surface or drag strip?
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      07-10-2021, 11:54 PM   #81
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Originally Posted by G_B58 View Post
Can you get it to hook on a prepped surface or drag strip?
Haven’t taken it to the track yet..planning to go end of the month
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      07-13-2021, 10:56 AM   #82
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Hey guys,

I have been doing some scrolling through the dragy app to grab some data for you guys of m340i users using the JB4 as the data on the forums has not been good. Keep in mind all these guys are xdrive so they can take advantage of that power off the line more than the rwd guys blowing their tires off on the street.

Found two people well into low 11s.
One guy even using only a JB+ and downpipe:

JB4 E40 mix almost in the 10s:

Plus a full tuned m340i in the 10s, I had yet to see one in the 10s with stock turbo so I includes as bonus:
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      07-13-2021, 01:46 PM   #83
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Quote:
Originally Posted by GhostMajor View Post
All these draggy results are a one timer. I spoke with pretty much every of these guys and they have never acheived these results twice.

Also they are on E40 aka jet fuel and nobody uses E40 on a daily basis.

It's kinda wierd that you didn't include other JB4 user running pump gas 91 with much less impressive results.

Again nobody here is saying JB4 doesn't work. It highly rely on HIGH OCTANE gas to show results aka 91oct with octane booster or 93+ otherwise nothing is happening even in map1 wich several M340I already pointed out with numbers backing these claims aka draggy or 1/4 mile drag strip proof.

I have a friend who'm owns a kia stinger gt and they have the same issue. On 91oct gas very little to no result. When they crank the octane, the results are fairly different.
I run 93 with jb4 and have no E85 pumps in my area. Recently picked up a dragy, but have been having issues with low satellite. Once I figure that out I will post my results. I had no intent of showing a bias or anything, I just quickly scrolled through and found cars in the top runs for each month. If what you are saying is true about all the maps needing more octane it sounds like the maps need some serious tweaking from BMS.
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      07-13-2021, 03:47 PM   #84
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GhostMajor- Absolutely correct, octane levels play a huge part in achieving big gains with a jb4 - E85 is magical in this respect. Where I don’t agree with you is the “one time” statement - my latest runs were done back to back and the results were just about the same. The car is just a different animal once you introduce e85 into the equation, but that goes really with any tune, flash or piggyback - fuel is VERY important. Luckily for me, I have access to 93 gas here in NJ and a station 25 mins away that carries e85. What I typically do is make a monthly trip there and fill up my car and also my VP Racing gas canisters.
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      07-13-2021, 05:00 PM   #85
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Quote:
Originally Posted by GhostMajor View Post
I was running 91oct shell + royal purple(+3) so technically 94oct. Best results after testing Map1-2-3-5 has been map1.

Gonna fill the tank tommorow with boostane and crank it to 97oct.

I'll do 3 runs in every map and see if it has made a difference or not.
I've heard mixed reviews on octane boosters, can't they also gunk up your injectors and plugs?
I had great success with the brand Race Gas, which I believe is just a really high concentrate. I was told not to use the purple version if you have cats.
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      07-13-2021, 06:15 PM   #86
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Yea, octane boosters shouldnt be used regularly. E85 is the best way to go, but unfortunately for some, stations carrying E85 aren’t nearby
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      07-14-2021, 06:00 AM   #87
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Also the guy with a jb4 and e50 most likely either has mhd flash with the jb4 or his draggy isn’t accurate d/a should not be -1000 negative
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      07-14-2021, 09:09 AM   #88
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Quote:
Originally Posted by Antec800 View Post
Also the guy with a jb4 and e50 most likely either has mhd flash with the jb4 or his draggy isn’t accurate d/a should not be -1000 negative
He claims his car is a 2021 so it can't be MHD flashed unless you want to assume he is lying about his cars model year and using a jb4.

A negative DA is possible when its cold, which it is by the temperature you see there 34F.
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