Using a defouler on e90

KK4MEI · 04-11-2018, 10:06 PM

Will a defouler work on the e90 when using catless down pipes vs using DP-Fix's

dleccord · 04-11-2018, 10:21 PM

Does it deepen the sound

EndOfAnEra · 04-11-2018, 10:42 PM

Quote:

Originally Posted by dleccord

Does it deepen the sound

RocketSurgeon · 04-11-2018, 11:40 PM

Defoulers will not work, the DME is too sensitive. Besides that, there's not enough room to actually install them anyway.
Keep in mind that the dp-fix is a fiddly thing and BMW uses all 4 O2 sensors for AFR calculations

blown07 · 04-12-2018, 01:09 PM

Quote:

Originally Posted by RocketSurgeon

Defoulers will not work, the DME is too sensitive. Besides that, there's not enough room to actually install them anyway.
Keep in mind that the dp-fix is a fiddly thing and BMW uses all 4 O2 sensors for AFR calculations

I agree there is barely enough room for the secondary O2 sensors as is.

Jeff@TopGearSolutions · 04-12-2018, 01:52 PM

Historically they do not work on this platform.

GEOS07335i · 04-12-2018, 02:04 PM

Quote:

Originally Posted by RocketSurgeon

Defoulers will not work, the DME is too sensitive. Besides that, there's not enough room to actually install them anyway.
Keep in mind that the dp-fix is a fiddly thing and BMW uses all 4 O2 sensors for AFR calculations

They do have a 90 degree defouler and I hear they do fit whether or not they work is another story.

Even if they do work I dont think it would be recommended if you keep them in for any length of time. If the DME is using values from pre / post cat O2 sensors to make calculations on AFR then using the defouler for an extended period of time may cause other issues.

RocketSurgeon · 04-13-2018, 01:51 AM

You can simply code out the cat codes if you have an MHD license to read and flash .bin files.

04-11-2018, 10:06 PM	#1
KK4MEI Private First Class 25 Rep 99 Posts Drives: 2005 BMW X3 Join Date: Feb 2017 Location: Burlington NC iTrader: (0)	Using a defouler on e90 Will a defouler work on the e90 when using catless down pipes vs using DP-Fix's
	Appreciate 0 Tweet Quote

04-11-2018, 10:21 PM	#2
dleccord Captain 101 Rep 841 Posts Drives: 2011 BMW 335i E90 Join Date: Apr 2016 Location: Nelson, New Zealand iTrader: (0)	Does it deepen the sound
	Appreciate 0 Quote

04-11-2018, 11:40 PM	#4
RocketSurgeon Lieutenant 264 Rep 459 Posts Drives: 2008 135i Manual, CBR650F Join Date: Jan 2017 Location: NC iTrader: (0)	Defoulers will not work, the DME is too sensitive. Besides that, there's not enough room to actually install them anyway. Keep in mind that the dp-fix is a fiddly thing and BMW uses all 4 O2 sensors for AFR calculations
	Appreciate 1 Quote

04-12-2018, 01:52 PM	#6
Jeff@TopGearSolutions 3442 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Historically they do not work on this platform.
	Appreciate 1 Quote

04-13-2018, 01:51 AM	#8
RocketSurgeon Lieutenant 264 Rep 459 Posts Drives: 2008 135i Manual, CBR650F Join Date: Jan 2017 Location: NC iTrader: (0)	You can simply code out the cat codes if you have an MHD license to read and flash .bin files.
	Appreciate 0 Quote