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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > How many run cobb+JB4?



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      06-06-2013, 06:02 PM   #1
SouthfloridaE92
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How many run cobb+JB4?

I currently have a jb4 g5 board and plan to run meth + e85 i am currently just FBO . But plan on purchasing meth and wondering if the inline pump is worth it.Just wondering how many of you run Cobb + JB4 for e85 purposes . Or whatever purposes for that reason, just list your opinion and thoughts. Or if I should switch to Cobb.
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      06-06-2013, 06:49 PM   #2
AWil335i
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Originally Posted by SouthfloridaE92 View Post
I currently have a jb4 g5 board and plan to run meth + e85 i am currently just FBO . But plan on purchasing meth and wondering if the inline pump is worth it.Just wondering how many of you run Cobb + JB4 for e85 purposes . Or whatever purposes for that reason, just list your opinion and thoughts. Or if I should switch to Cobb.
Have you run E85 yet? You need to start with a low mix and log your LPFP and HPFP. Your E85 mix, meth, and variables with your DME and fuel system will determine whether you need to do either the LPFP upgrade or the flash.
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      06-06-2013, 06:53 PM   #3
Mike@N54Tuning.com
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Cobb maps + JB4 won't work. You need the BMS back end flash to go along with the JB4 G5 ISO. The flash is loaded via a Cobb AP device so that might be where you are mixed up. BMS will send you the flash file after you let them know your DME version, intended fuel, and mods. For running more than 50% E85 no meth its strongly suggested. Nice gains over the JB4+factory flash in those circumstances.

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