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Ezmoney340i Ezmoney340i is offline
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Default Newbie 2017 340i - JB4 tuning question - 11-30-2020, 11:35 AM

Hi all. So came over to the dark side from Ls1 tech. Sold my Cts-V and purchased 2017 340i X drive 6 speed. Installed JB4 tune, BMS intake, and VRSF ********. The car is running strong. Using MAP 3 but notice some sputtering on boost when wide open. Also it reverts to MAP 8 which im told is the safety MAP. JB4 seems to think it may be misfiring. Was hoping there are any tune experts here who can look at the data (attached here) and offer some advice. The log has 3 different runs. When reading the boost its all over the place? Any help would be gratefully appreciated!!
Attached Files
File Type: csv P58_M3_R1_201129_2001.csv (191.2 KB, 17 views)
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Ezmoney340i Ezmoney340i is offline
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Default 12-03-2020, 09:23 AM

dont everyone respond at the same time?? What up with the BMW world? Would always get tons of replies on LS1 tech but cant get anyone on any of the BMW forums to help. WHAT A GREAT COMMUNITY YOU HAVE HERE!! smh!!
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 12-07-2020, 02:01 PM

You posted this in the wrong forum. I'll move it over for you.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 12-07-2020, 02:02 PM

Do you have an EWG connector installed?

Update to v19 firmware and grab another log.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Ezmoney340i Ezmoney340i is offline
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Default 12-07-2020, 02:08 PM

Thank you Terry. EWG Connector? I have the mobile connector. When did the V19 update come out? I purchased the Jb4 new about 3 weeks ago and installed right away.
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