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Justin1 Justin1 is offline
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Default 11 535xi f10 issues/questions - 12-17-2018, 01:59 PM

Car currently has a JB4, mufflers, *** delete(no *****), 450lph in tank pump, otherwise stock. 90k miles



The throttle shuts on gear changes, anyway to remedy that? I assume it's for torque reduction.

@WOT I see it takes a bit for the AFR to recover after the gear changes(lean), the afr will gradually get richer through the rpms. Is this normal? Is there anyway to make wot fueling adjustments or is that all done through BMS?

Transmission shifts- I would like it to shift around 6k at wot, what would I need to do for that? Separate trans tuning software? The xhpflash tool?

Dynoing the car. I've seen multiple opinions on disabling the fwd. Pulling the awd fuse, #25? is that effective?


Recently on a cold start the car will stumble, misfire, failsafe. Basically undriveable and throws multiple codes. Shut the key off count to 3, restart and its fine the rest of the day. The spark plugs have been pulled/inspected, I have replaced 2 injectors with aftermarket replacements (#2/#6). The high psi fuel pump was replaced prior to me owning the car. I attached a screen shots of the codes I get.

Any help/advice would be appreciated. Thanks!!



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ziekxqq ziekxqq is offline
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Default 12-23-2018, 02:22 AM

When was the last time you replaced your spark plugs?
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is online now
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Default 12-25-2018, 11:39 AM

Misfires can have a lot of possible causes. First step might be to post a JB4 log so we we can check the basics like boost, fuel pressure, AFR, timing, etc.


Burger Motorsports
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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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Justin1 Justin1 is offline
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Default 12-27-2018, 10:22 AM

Changed spark plugs about 4k miles ago, when it was unmodified. I'm going to pull them and check. Running a decent amount more boost since the JB4 install, Map 2.

Any particular spark plug you guys recommend and what gap?


Lately the car has been acting fine in regards to the failsafe/limp mode.

@Terry, you have looked at my logs with the latest map 2 update and everything looked good.

Just installed your air intake kit over the weekend, fit was excellent.
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Terry @ BMS's Avatar
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Default 12-27-2018, 11:33 AM

We suggest 2step colder NGK gapped to 0.022" on our site.

If logs look OK, then maybe a failing coil?


Burger Motorsports
Home of the Worlds fastest N20s, N54s, N55s, S55s, N63s, and S63s!

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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