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      01-30-2013, 10:05 PM   #21
Second Lieutenant

Drives: 2011 Bmw 335i M sport
Join Date: Nov 2011
Location: Beverly Hills California

iTrader: (1)

How can you fix overboost and what is knocking exactly?

Originally Posted by Gugs View Post
The answer is-
Your overboosting or knocking.

With the newer firmwares we have new features...

The Jb4 goes into safety mode and forces itself into map 4 until you restart the car.
look for flashing check engine lights right before it happens, 1 flash is overboost and several is knock.

This is exactly what is happening-
as its defaulting to map 4 and leaving you to OEM map/boost levels.

Put in less e85 and it will most likely help the issue.
2011 BMW 335i M Sport- Space Grey Metallic * Black Kidney Grills * Jb4 Stage 2 ISO * Injen Intake * AR 4" Downpipe * 19" VMR V710 * Michelin Pilot Super Sports 235/265 * KW V3 Coilovers * 8k Alpine Angel Eyes * Gloss Black Roof Vinyl