Lambda probe (11787540167)

wyshyvanuk · 08-28-2023, 03:13 PM

Does anyone know if these pre-cat oxygen sensors (2008 Z4M) are "wide band"?
Would like to have an in-dash air/fuel ratio display, but I'm more than usually clueless about the procedure. If they are wide-band, it would be tempting to somehow tap into their output, without disturbing the ECU input. Any insight? Thanks, Ted.

grannyknot · 08-28-2023, 03:40 PM

I put a wide band O2 sensor in one of the vacant front of header sensor holes so I could have air/fuel ratio in the cab. S54 engine.
The ECU and tune are so reliable that I stopped looking at it, when you gun it the mixture is richer so the ratio goes to 11-12 then back up to 14.7 where it almost always sits, let off the gas pedal and it leans out a bit, 16-17 then back to 14.7
I finally removed it.

pokeybritches · 08-28-2023, 05:07 PM

They are 6-wire Bosch wideband sensors. You won’t be able to tap into any of the wires and get useful data due to the way wideband sensors work. Wideband sensors require a controller to output anything meaningful.

You could read lambda over K-Line if you know what to look for and have the tools. It’s better to have a standalone sensor and controller such as an Innovate LC-2. Calculated AFR can be displayed with a P3Cars digital vent gauge. Or, you could get an Innovate LM-2 and mount the display in the cabin. Just don’t leave the sensors installed in the exhaust but electrically unpowered; otherwise, they will foul quickly.

wyshyvanuk · 08-28-2023, 05:17 PM

1. Looks like both of my pre-cat holes are occupied by sensors. Are the holes on Canadian headers blocked off?
2. I was hoping for a "trust-but-verify" approach with the G-Power Supercharger. But I should probably go for a full Severn Tuning approach and call it a day. Pokey rocks!!
3. I was looking for a way to spend even more $$ on the Z4. The search continues ;~).

wyshyvanuk · 08-28-2023, 05:22 PM

Josh, I was writing my reply when yours appeared. Thanks!!

grannyknot · 08-29-2023, 05:04 AM

Quote:

Originally Posted by wyshyvanuk

1. Looks like both of my pre-cat holes are occupied by sensors. Are the holes on Canadian headers blocked off?
2. I was hoping for a "trust-but-verify" approach with the G-Power Supercharger. But I should probably go for a full Severn Tuning approach and call it a day. Pokey rocks!!
3. I was looking for a way to spend even more $$ on the Z4. The search continues ;~).

I removed the front two O2 sensors because I removed the front cats.

wyshyvanuk · 08-29-2023, 08:16 AM

Understand. Thanks, granny knot!!

08-28-2023, 03:13 PM	#1
wyshyvanuk Second Lieutenant 449 Rep 229 Posts Drives: 2008 Z4 MR Join Date: Apr 2018 Location: Tucson AZ iTrader: (0)	Lambda probe (11787540167) Does anyone know if these pre-cat oxygen sensors (2008 Z4M) are "wide band"? Would like to have an in-dash air/fuel ratio display, but I'm more than usually clueless about the procedure. If they are wide-band, it would be tempting to somehow tap into their output, without disturbing the ECU input. Any insight? Thanks, Ted. Last edited by wyshyvanuk; 08-28-2023 at 04:56 PM.. Reason: Correct date.
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08-28-2023, 03:40 PM	#2
grannyknot Captain 952 Rep 781 Posts Drives: 2008 Z4M coupe Join Date: Oct 2021 Location: toronto iTrader: (0)	I put a wide band O2 sensor in one of the vacant front of header sensor holes so I could have air/fuel ratio in the cab. S54 engine. The ECU and tune are so reliable that I stopped looking at it, when you gun it the mixture is richer so the ratio goes to 11-12 then back up to 14.7 where it almost always sits, let off the gas pedal and it leans out a bit, 16-17 then back to 14.7 I finally removed it. __________________ 2008 E86 M coupe
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08-28-2023, 05:07 PM	#3
pokeybritches Colonel 479 Rep 2,782 Posts Drives: ESS/G-Power Z4M, VF Z4, 996tt Join Date: Sep 2009 Location: Los Angeles iTrader: (12) Garage List 2006 BMW Z4M [10.00] 2006 BMW Z4M [8.50] 2003 BMW Z4 3.0i [9.00]	They are 6-wire Bosch wideband sensors. You won’t be able to tap into any of the wires and get useful data due to the way wideband sensors work. Wideband sensors require a controller to output anything meaningful. You could read lambda over K-Line if you know what to look for and have the tools. It’s better to have a standalone sensor and controller such as an Innovate LC-2. Calculated AFR can be displayed with a P3Cars digital vent gauge. Or, you could get an Innovate LM-2 and mount the display in the cabin. Just don’t leave the sensors installed in the exhaust but electrically unpowered; otherwise, they will foul quickly. __________________ VF Engineering Z4 3.0i, ESS Z4M, G-Power Z4M, 996 Turbo
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08-28-2023, 05:17 PM	#4
wyshyvanuk Second Lieutenant 449 Rep 229 Posts Drives: 2008 Z4 MR Join Date: Apr 2018 Location: Tucson AZ iTrader: (0)	1. Looks like both of my pre-cat holes are occupied by sensors. Are the holes on Canadian headers blocked off? 2. I was hoping for a "trust-but-verify" approach with the G-Power Supercharger. But I should probably go for a full Severn Tuning approach and call it a day. Pokey rocks!! 3. I was looking for a way to spend even more $$ on the Z4. The search continues ;~).
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08-28-2023, 05:22 PM	#5
wyshyvanuk Second Lieutenant 449 Rep 229 Posts Drives: 2008 Z4 MR Join Date: Apr 2018 Location: Tucson AZ iTrader: (0)	Josh, I was writing my reply when yours appeared. Thanks!!
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08-29-2023, 08:16 AM	#7
wyshyvanuk Second Lieutenant 449 Rep 229 Posts Drives: 2008 Z4 MR Join Date: Apr 2018 Location: Tucson AZ iTrader: (0)	Understand. Thanks, granny knot!!
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