6th gear jb4 problems

Xchrisxxxx · 03-19-2020, 03:01 AM

Hey guys, been a long time since I've brought this up, but no one seems to be able to help me still, currently I am dealing with an issue when I shift into 6th gear, I am BBK 3.4 with port injection MHD BEF and jb4.
Anytime I'm WOT and I shift into 6th I overboost to about 35psi when my target is set for 30psi, in any other gear i hold a steady 28psi to 30psi.
Also to note my WGDC drops significantly in 6th gear.
Lastly noted, if I do a 6th gear only pull it also overboosts to high hell.
Any ideas? Suggestions? It's very hard to have a clean run in mexico with this ongoing issue 😭

n55david · 03-19-2020, 07:13 AM

Quote:

Originally Posted by Xchrisxxxx

Hey guys, been a long time since I've brought this up, but no one seems to be able to help me still, currently I am dealing with an issue when I shift into 6th gear, I am BBK 3.4 with port injection MHD BEF and jb4.
Anytime I'm WOT and I shift into 6th I overboost to about 35psi when my target is set for 30psi, in any other gear i hold a steady 28psi to 30psi.
Also to note my WGDC drops significantly in 6th gear.
Lastly noted, if I do a 6th gear only pull it also overboosts to high hell.
Any ideas? Suggestions? It's very hard to have a clean run in mexico with this ongoing issue

What trans?

Xchrisxxxx · 03-23-2020, 12:27 AM

Quote:

Originally Posted by Phantom10R

What trans?

I believe hp45 , it's a 13 335i with xhp s3 tcu flash

harkes · 03-23-2020, 01:49 AM

Quote:

Originally Posted by Xchrisxxxx

I believe hp45 , it's a 13 335i with xhp s3 tcu flash

Dont push more than 700nm through 6th gear MAX! Your transmission might only be able to take more than 600nm before slipping...

Xchrisxxxx · 03-23-2020, 07:18 PM

Quote:

Originally Posted by harkes

Dont push more than 700nm through 6th gear MAX! Your transmission might only be able to take more than 600nm before slipping...

Its.not a slipping issue. It's a tune issue that I cant pinpoint

Fuel-It! · 03-23-2020, 07:55 PM

Let's see the JB4 log of the problem and from that I can offer tuning advice for resolving it.

Xchrisxxxx · 03-25-2020, 03:32 PM

Quote:

Originally Posted by Fuel-It!

Let's see the JB4 log of the problem and from that I can offer tuning advice for resolving it.

https://datazap.me/u/xchrisxxxx/overboost-issue?log=0&data=1-4-5-11-30
The log requested.
Thank you in advance

Fuel-It! · 03-26-2020, 10:54 AM

I think the basic issue here is that your flash boost target is too low, and some settings could also be optimized for 6th gear. Email the log to Terry @ BMS they can probably customize a flash file for your situation.

mike@x-ph.com · 03-26-2020, 10:59 AM

Quote:

Originally Posted by Xchrisxxxx

Hey guys, been a long time since I've brought this up, but no one seems to be able to help me still, currently I am dealing with an issue when I shift into 6th gear, I am BBK 3.4 with port injection MHD BEF and jb4.
Anytime I'm WOT and I shift into 6th I overboost to about 35psi when my target is set for 30psi, in any other gear i hold a steady 28psi to 30psi.
Also to note my WGDC drops significantly in 6th gear.
Lastly noted, if I do a 6th gear only pull it also overboosts to high hell.
Any ideas? Suggestions? It's very hard to have a clean run in mexico with this ongoing issue 😭

Anytime you have an issue with the Jb4, I strongly recommend reaching out to them directly. They are responsive and very helpful. They will also have better advice than anyone on this forum including me

Xchrisxxxx · 03-26-2020, 09:32 PM

Quote:

Originally Posted by Fuel-It!

I think the basic issue here is that your flash boost target is too low, and some settings could also be optimized for 6th gear. Email the log to Terry @ BMS they can probably customize a flash file for your situation.

You know that is the only thing I havent tried yet. Thanks for the insight

03-19-2020, 03:01 AM	#1
Xchrisxxxx Private 26 Rep 75 Posts Drives: 2013 335i M-Sport Join Date: Sep 2018 Location: South Florida iTrader: (0)	6th gear jb4 problems Hey guys, been a long time since I've brought this up, but no one seems to be able to help me still, currently I am dealing with an issue when I shift into 6th gear, I am BBK 3.4 with port injection MHD BEF and jb4. Anytime I'm WOT and I shift into 6th I overboost to about 35psi when my target is set for 30psi, in any other gear i hold a steady 28psi to 30psi. Also to note my WGDC drops significantly in 6th gear. Lastly noted, if I do a 6th gear only pull it also overboosts to high hell. Any ideas? Suggestions? It's very hard to have a clean run in mexico with this ongoing issue 😭
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03-23-2020, 07:55 PM	#6
Fuel-It! Banned 550 Rep 949 Posts Drives: M4, M5, M2C, X4M, 440i, etc... Join Date: Mar 2019 Location: Phoenix AZ iTrader: (0)	Let's see the JB4 log of the problem and from that I can offer tuning advice for resolving it.
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03-26-2020, 10:54 AM	#8
Fuel-It! Banned 550 Rep 949 Posts Drives: M4, M5, M2C, X4M, 440i, etc... Join Date: Mar 2019 Location: Phoenix AZ iTrader: (0)	I think the basic issue here is that your flash boost target is too low, and some settings could also be optimized for 6th gear. Email the log to Terry @ BMS they can probably customize a flash file for your situation. Attached Images
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