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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 > jb4 Meth - menu 4/4 or 4/2?



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      06-18-2017, 05:45 AM   #1
jamhot
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Drives: 335i FBO
Join Date: Dec 2015
Location: UK Derbyshire

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jb4 Meth - menu 4/4 or 4/2?

Guys, I am getting an under boost problem using meth in map 3. I am using a wedge race flash from MHD as a BEF. The impression I get is that because the boost is held in "low boost" map until the meth fires, while under part throttle I am getting an under boost issue. If I switch to menu 4/4 (flash only) I can get full boost usually much sooner than the meth activation but no issues with part throttle under boosting. Do I still get the protection features from the JB4 in menu 4/4 because I do like the power punch i get but i'm worried i may get pre-ignition. Not sure how to go about this because the "safe" boost restricting option until meth throws underboost codes. What config do people run to get around this?????
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