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kyle_rg85 kyle_rg85 is offline
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Angry MHD BEF causing 4.5k rev limit - 10-15-2018, 05:15 PM

Hi guys, first post here. I have installed the MHD back end flash on my 07 335i and for some reason it causes the car to rev limit at 4.5k rpm. It's driving me nuts. No codes. I've installed it before and sometimes it doesn't do this. I've tried different DCAN cables, same thing. Used both race and pump flash, same thing. Installed stock map first and then completely reinstalled the BEF, no change. Fully charged battery with charger hooked up during install. Let the car go to sleep after the install. WTF!!! Any ideas guys?

Thanks
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Terry @ BMS's Avatar
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Default 10-15-2018, 06:19 PM

Log?

2step installed?


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kyle_rg85 kyle_rg85 is offline
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Default 10-15-2018, 06:28 PM

Sorry don't have a log right now but i'll get one soon, not sure what use it would be? No 2 step installed. If I revert back to stock map (4/3) it does not rev limit, turn the BEF back on (4/2) and it limits again
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Default 10-15-2018, 07:02 PM

Doesn't add up so post a log!


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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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duracell8 duracell8 is offline
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Default 10-16-2018, 04:25 PM

Just guessing here but seems like u have misfires not rev limiter. Common symptom after installing a bef or JB4 is chronic misfires. Mileage? Mods? Logs?? Without u posting the basic info necessary I’m just assuming ur relatively new to the platform/tuner and should start with the basics before assuming more complicated that the obvious. Is auto delete on? Did u get the tuner brand new or second hand?



2008 535i RB Turbos, ER Charge pipe, Tial BOV, 2.3 gal BMS Meth 75/25, Dual nozzle CM10 and CM7, BMS Race Flash, 3" Down Pipe, JB4 ISO G5, N20 Map Sensor, BMS OCC, BMS PCV Valve, JB4 Mobile App, 12.3 @ 116 mph
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kyle_rg85 kyle_rg85 is offline
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Default 10-16-2018, 05:48 PM

Quote:
Originally Posted by duracell8
Just guessing here but seems like u have misfires not rev limiter. Common symptom after installing a bef or JB4 is chronic misfires. Mileage? Mods? Logs?? Without u posting the basic info necessary Iím just assuming ur relatively new to the platform/tuner and should start with the basics before assuming more complicated that the obvious. Is auto delete on? Did u get the tuner brand new or second hand?
Nope not misfires, it's a clear rev limit caused by the back end flash. Like I said above if I turn the back end flash off the issue goes away, back to normal rev limit. It's very annoying, no one knows why it's doing this. I have XHP transmission flash as well which could be interfering with the BEF for some reason as well. I've reinstalled it several times as well as the BEF. Still working on this annoying issue
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Default 10-16-2018, 06:34 PM

Are you using the right BEF?


07 E90 AT 335I 130k
JB4 G5 - Race BEF
DCI
VRSF CP - TS RP BOV-Orange Spring
VRSF V2 D-P's
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kyle_rg85 kyle_rg85 is offline
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Default 10-16-2018, 06:51 PM

Quote:
Originally Posted by Haynpunch
Are you using the right BEF?
As far as I know yes, I have the I8A0S hardware so I used the BEF marked as "JB4_BB2_I8A0S_PUMP" and I used the race flash as well. It's frustrating because I've gotten it to work before, it's just sometimes if I have to re flash it it will do this rev limit thing
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Default 10-16-2018, 07:28 PM

Quote:
Originally Posted by kyle_rg85
Sorry don't have a log right now but i'll get one soon, not sure what use it would be? No 2 step installed. If I revert back to stock map (4/3) it does not rev limit, turn the BEF back on (4/2) and it limits again
It's not your BEF. You can't turn off the BEF because it's in the DME. When you go into map 4-3, you're telling the JB4 you have a stock DME. (as per Payem reply to one of my questions)

Take a good look at your JB4 settings. Me thinks you may be in valet mode.


No matter how fast I go there's always someone slower in front of me.

You can lead a horse to water but you can't make him Jet Ski.

'10 E92 335 M Sport, JB-4 G5 ISO, 3" CPE Charge pipe, WMI w/dual CM 5 nozzles, 3.5 Tmap, E85 BEF, Front Strut Brace, SS brake lines, Drilled and Slotted Rotors, Anti-lag, OCC. Escort Max 360

Totaled by a careless driver:
'08 E92 335, M sport option
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kyle_rg85 kyle_rg85 is offline
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Default 10-16-2018, 07:46 PM

Quote:
Originally Posted by 08 335Ci
It's not your BEF. You can't turn off the BEF because it's in the DME. When you go into map 4-3, you're telling the JB4 you have a stock DME. (as per Payem reply to one of my questions)

Take a good look at your JB4 settings. Me thinks you may be in valet mode.
Interesting, any idea why it would go away when I go to 4/3? And only comes back when I turn the BEF on? (4/2). I didn't know jb4 had valet mode, I'll try to find that, or maybe the BEF has some kind of valet mode
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kyle_rg85 kyle_rg85 is offline
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Default 10-16-2018, 07:56 PM

ya tried to toggle valet mode of and off (4/7), not working. The car is basically stuck in valet mode whenever the BEF is enabled
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kyle_rg85 kyle_rg85 is offline
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Default 10-16-2018, 08:23 PM

I'm reading that some people are saying 4/2 and 4/3 are to toggle transport mode on and off? Was this on some old jb4 models? If so, which one turns the BEF on and off on my car if I have this old jb4?
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kyle_rg85 kyle_rg85 is offline
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Default 10-16-2018, 08:48 PM

ok looks like I had old firmware where 4/3 and 4/2 were to toggle transport mode on/off, I thought it was for turning the BEF on and off like the latest firmware. Updating it now.
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Default 10-16-2018, 08:53 PM

Don't leave TRA on it will cut out regardless of flash.


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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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Rickster1269 Rickster1269 is offline
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Default 11-03-2018, 09:09 AM

Did updating work for you Im still having the same issue
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kyle_rg85 kyle_rg85 is offline
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Default 11-03-2018, 09:14 AM

Quote:
Originally Posted by Rickster1269
Did updating work for you Im still having the same issue
Yes, solved the issue. The menu is different in the old jb4 firmware so 4/2 and 4/3 turn valet mode on and off
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Default 11-03-2018, 09:39 AM

Quote:
Originally Posted by Rickster1269
Did updating work for you Im still having the same issue
If TRA shows in dash you need to turn it off!


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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Rickster1269 Rickster1269 is offline
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Default 11-03-2018, 12:17 PM

Tra Mode is not displayed
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Terry @ BMS's Avatar
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Default 11-03-2018, 01:31 PM

Then you must have a other issue. 2step installed?


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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Rickster1269 Rickster1269 is offline
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Default 11-03-2018, 01:35 PM

No sir no 2 step
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Terry @ BMS's Avatar
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Default 11-04-2018, 12:54 PM

Then log issue coming up.


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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