JB4 map 2 or 3?

idontsave · 11-07-2022, 05:19 PM

Quote:

Originally Posted by XC3LLR8

Quote:

Originally Posted by idontsave

I would certainly be very careful running +4 PSI on 91 and running any higher boost than that with an additive map on 93 without proper logging.

Despite what BMS says, people have blown their turbos when running the more aggressive additive options. Not to knock them, but I have seen them advise some of the Supra guys to run JB4 map 3 only for disaster to result.

Mike's advice on the other hand seems to be spot-on. Definitely would be the safer way to go.

I only run 93 (unless unavailable on a road trip) and even try to be picky where I get my gas. I have not made any adjustments to the JB+, so my additional boost should be limited to 4 psi or less. I really hope the BMS and Dinan tech guys are being honest when they say their +/Sport tuners are "mild" and "perfectly safe" on a G chassis.

Once I go the JB4 route I'll likely skip the Maps 1-3 and leave it on Map 4 with logs sent to BMS as Mike suggests.

Another option would be to get a custom map made after logging map 4.

There is one guy who has had universally positive feedback from both BMW and Supra communities regarding smooth power delivery and safe performance optimization as far as it goes on the JB4.

Not cheap at all but it's the way I would have gone if I were to get JB4. I'm at the point now where I will likely be shipping my ECU to Femto for the unlock instead

Robinde · 11-08-2022, 06:04 PM

I just talked to burger motorsports with the question of over boosting with the jb4 piggyback. I told them I was running the jb4 on map 2 with the aa catted downpipe. Under these circumstances I was told as long as the electronic waste gate was hooked in overboostng would not be an issue. This setup is on my 2022 M 240I.

mike@x-ph.com · 11-12-2022, 09:39 AM

Quote:

Originally Posted by Robinde

I just talked to burger motorsports with the question of over boosting with the jb4 piggyback. I told them I was running the jb4 on map 2 with the aa catted downpipe. Under these circumstances I was told as long as the electronic waste gate was hooked in overboostng would not be an issue. This setup is on my 2022 M 240I.

danallxt · 11-12-2022, 03:36 PM

RE: post 19 of this thread.
To me that transcript of emails is fairly meaningless.
there is no discussion of JB+ boost relative to recommended octane for relative boost setting.

Keep in mind there is a range of Prem octane in US from 91 to 93, and there is a range of settings available with the JB+.
Frankly i would not run JB+ at max setting with 91 octane.

XC3LLR8 · 11-12-2022, 04:29 PM

Quote:

Originally Posted by danallxt

RE: post 19 of this thread.
To me that transcript of emails is fairly meaningless.
there is no discussion of JB+ boost relative to recommended octane for relative boost setting.

Keep in mind there is a range of Prem octane in US from 91 to 93, and there is a range of settings available with the JB+.
Frankly i would not run JB+ at max setting with 91 octane.

I do not understand why a discussion on fueling was necessary in order for BMS to confirm the JB+ w/a high flow DP is safe. If specific fueling requirements were necessary to run the JB+ BMS would specify, just as they do for certain maps on JB4. Also, on the JB+ webpage BMS shows a dyno chart where 91 octane was used to achieve the results.

The fact fueling was not discussed makes the transcript even more meaningful as it shows the JB+ is safe and marketed in all 50 states, where 93 is not always available.

Like you, I also would not use 91 on max setting, just to be cautious, but then again I wouldn't use max setting with 93 either. I'm pleased with the default setting, which I run with E30 on 93.

dasistato · 11-22-2022, 03:32 PM

Newbie here. How would one go about data logging? What device/app needed? How long the data should be logged for?

XC3LLR8 · 11-22-2022, 03:43 PM

Quote:

Originally Posted by dasistato

Newbie here. How would one go about data logging? What device/app needed? How long the data should be logged for?

You can datalog with a JB4 and start in 3rd gear (manual) at about 2,500 RPM's and floor it to redline.

mike@x-ph.com · 11-23-2022, 10:53 AM

Quote:

Originally Posted by dasistato

Newbie here. How would one go about data logging? What device/app needed? How long the data should be logged for?

Quote:

Originally Posted by XC3LLR8

You can datalog with a JB4 and start in 3rd gear (manual) at about 2,500 RPM's and floor it to redline.

This and traction needs to be fully off (not MDM)

XC3LLR8 · 11-23-2022, 01:25 PM

Quote:

Originally Posted by mike@x-ph.com

This and traction needs to be fully off (not MDM)

Does "fully off" mean a quick press of the Traction Control button (like you would do for Launch Control), or a long press?

mike@x-ph.com · 11-23-2022, 01:51 PM

Quote:

Originally Posted by XC3LLR8

Does "fully off" mean a quick press of the Traction Control button (like you would do for Launch Control), or a long press?

long press

heelsmj · 03-03-2023, 09:30 PM

Quote:

Originally Posted by idontsave

Not to knock them, but I have seen them advise some of the Supra guys to run JB4 map 3 only for disaster to result.

I never knew map 3 could be an issue. I have been running map 3 on my M340 as a daily driver for almost 3 years. I don’t drive that much but I have put 13K miles on it under map 3 with zero issues. Why is that problematic? I just ordered an M240 so I am trying to see about moving my JB4 over and trying to learn thanks!

idontsave · 03-08-2023, 09:32 PM

Quote:

Originally Posted by heelsmj

I never knew map 3 could be an issue. I have been running map 3 on my M340 as a daily driver for almost 3 years. I don’t drive that much but I have put 13K miles on it under map 3 with zero issues. Why is that problematic? I just ordered an M240 so I am trying to see about moving my JB4 over and trying to learn thanks!

At the time that I wrote this, I was referring to a few isolated incidents on the Supra forums where several people blew their turbos while running map 3.

Since then, I have also heard from one M240i driver who is on replacement turbo #3 (or 4) and has been running map 3 the whole time.

I know better than to definitively attribute anything to one factor when there’s also people like you who haven’t had any problem. At the same time, map 3 seems to be a common variable amongst those who have blown their turbos while running JB4.

heelsmj · 03-08-2023, 09:38 PM

Quote:

Originally Posted by idontsave

I know better than to definitively attribute anything to one factor when there’s also people like you who haven’t had any problem. At the same time, map 3 seems to be a common variable amongst those who have blown their turbos while running JB4.

Interesting. My M340 is a lease I am buying the M240 so I think I’m going to play it safe and run map 2.

idontsave · 03-08-2023, 09:42 PM

Quote:

Originally Posted by heelsmj

Interesting. My M340 is a lease I am buying the M240 so I think I’m going to play it safe and run map 2.

Based on this thread, running map 4 is generally recommended over map 2 since it has an absolute PSI target rather than the additive PSI that maps 1-3 utilize. There’s quite a lot of people that have been running map 2 regardless but just something to keep in mind.

heelsmj · 03-09-2023, 01:03 PM

Quote:

Originally Posted by idontsave

Based on this thread, running map 4 is generally recommended over map 2 since it has an absolute PSI target rather than the additive PSI that maps 1-3 utilize. There’s quite a lot of people that have been running map 2 regardless but just something to keep in mind.

OK now I’m really confused I thought map for was only for ethanol?? Can you please explain what you mean about an absolute target versus the additive map?

idontsave · 03-09-2023, 01:51 PM

Quote:

Originally Posted by heelsmj

OK now I’m really confused I thought map for was only for ethanol?? Can you please explain what you mean about an absolute target versus the additive map?

Maps 1-3 are additive PSI maps, meaning that they simply add a specific PSI of boost to whatever PSI the vehicle is already pushing. On the gen 2 B58s, the stock value can range from 15-20 PSI which can be problematic on these maps. Maps 4 and 5 are absolute PSI target maps, meaning that rather than simply adding to whatever PSI the car is pushing, they target a particular overall PSI value (i.e. 20 PSI) consistently. Map 4 is recommended for either 93 octane or E30.

Read the first page of the thread for more information on all of this.

heelsmj · 03-09-2023, 01:53 PM

Quote:

Originally Posted by idontsave

Map 4 is recommended for either 93 octane or E30.

Wow I did not know that. Thanks! I need to take a closer look at what all the maps are.

XC3LLR8 · 03-09-2023, 03:30 PM

I run map 4 with a 93/E30 blend. It makes me feel sad for those running stock.

Value · 03-09-2023, 04:28 PM

Data log,make sure fuel trims aren’t maxed and see if timing is being pulled. More timing > Less boost.. That’s the smartest way to pick a map. I’ve tried every map on 93 and E30 and they all pulled timing,some much worse than others. Terry set me up with a map 6 and it pulled so much timing it fell flat on its face lol

Map 2 on E30 is the strongest map with the most timing(for me anyways)

11.3@123mph is my best so far. All testing done with a dragy and data logging,no guessing.

Jesse is the only guy I would trust if you want a custom map to make more power safely.

If you are inexperienced or want to learn more about logging,fuel trims etc..Do some research on JB4Tech - https://www.jb4tech.com/forum/model-...ussion/b58-b48

beshsefen21 · 03-09-2023, 05:11 PM

So what maps do you recommend to run on 93 octane?

XC3LLR8 · 03-09-2023, 07:38 PM

Quote:

Originally Posted by beshsefen21

So what maps do you recommend to run on 93 octane?

1

G42UPRA · 03-09-2023, 08:36 PM

Curious if map 4 might be more viable on 93 octane if you live at higher altitude?

If im daily driving my car, I don't necessarily want to be forced to go out of my way all the time to mix ethanol since there aren't a ton of gas stations around here that sell it.

11-08-2022, 06:04 PM	#24
Robinde New Member 6 Rep 7 Posts Drives: M240I Join Date: May 2022 Location: Tucson iTrader: (0)	I just talked to burger motorsports with the question of over boosting with the jb4 piggyback. I told them I was running the jb4 on map 2 with the aa catted downpipe. Under these circumstances I was told as long as the electronic waste gate was hooked in overboostng would not be an issue. This setup is on my 2022 M 240I.
	Appreciate 2 XC3LLR82086.50 hyperpip25.50 Quote

11-12-2022, 03:36 PM	#26
danallxt Captain 746 Rep 706 Posts Drives: 2022 M240x, 2007 Honda VFR Join Date: Dec 2021 Location: Springfield, OR USA iTrader: (0)	RE: post 19 of this thread. To me that transcript of emails is fairly meaningless. there is no discussion of JB+ boost relative to recommended octane for relative boost setting. Keep in mind there is a range of Prem octane in US from 91 to 93, and there is a range of settings available with the JB+. Frankly i would not run JB+ at max setting with 91 octane.
	Appreciate 0 Quote

11-22-2022, 03:32 PM	#28
dasistato Private 46 Rep 87 Posts Drives: G42 M240i, E30 Join Date: Apr 2016 Location: VA iTrader: (0)	Newbie here. How would one go about data logging? What device/app needed? How long the data should be logged for?
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03-09-2023, 03:30 PM	#40
XC3LLR8 Banned 2087 Rep 1,559 Posts Drives: Super73 Join Date: Jan 2022 Location: Keller, TX iTrader: (0)	I run map 4 with a 93/E30 blend. It makes me feel sad for those running stock.
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03-09-2023, 04:28 PM	#41
Value First Lieutenant 584 Rep 360 Posts Drives: M240i Join Date: Jan 2022 Location: New York iTrader: (0)	Data log,make sure fuel trims aren’t maxed and see if timing is being pulled. More timing > Less boost.. That’s the smartest way to pick a map. I’ve tried every map on 93 and E30 and they all pulled timing,some much worse than others. Terry set me up with a map 6 and it pulled so much timing it fell flat on its face lol Map 2 on E30 is the strongest map with the most timing(for me anyways) 11.3@123mph is my best so far. All testing done with a dragy and data logging,no guessing. Jesse is the only guy I would trust if you want a custom map to make more power safely. If you are inexperienced or want to learn more about logging,fuel trims etc..Do some research on JB4Tech - https://www.jb4tech.com/forum/model-...ussion/b58-b48 Last edited by Value; 03-09-2023 at 04:45 PM..
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03-09-2023, 05:11 PM	#42
beshsefen21 Enlisted Member 11 Rep 34 Posts Drives: G42 M240 Join Date: Jan 2023 Location: NJ, USA iTrader: (0) Garage List 2023 BMW M240 [0.00]	So what maps do you recommend to run on 93 octane?
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03-09-2023, 08:36 PM	#44
G42UPRA Second Lieutenant 246 Rep 223 Posts Drives: Mazda 3 Join Date: Oct 2022 Location: Colorado iTrader: (0)	Curious if map 4 might be more viable on 93 octane if you live at higher altitude? If im daily driving my car, I don't necessarily want to be forced to go out of my way all the time to mix ethanol since there aren't a ton of gas stations around here that sell it.
	Appreciate 0 Quote