A/F ratio

Prince ///M · 12-30-2009, 02:37 PM

Please could someone indicate the parameter to be logged on bt in order to get the a/f information from o2 widebands and the convertion ratio (eg from volts to stoichiometric)?

Thanks in advance.

e.n335 · 12-30-2009, 09:56 PM

I need to know this as well.

Prince ///M · 01-02-2010, 04:16 AM

I probably found them.

- Lambda nominal value bank 1-2.

In addition the wideband signals are:
- voltage lambda probe in front of catalystic converter bank 1-2.

At the moment I don't have the conversion factors from volts to stoich but I think they are only a division and an offset away

e.n335 · 01-02-2010, 04:19 AM

Great ! Please keep me informed.

Thanks,
Eugen

enrita · 01-02-2010, 04:27 AM

Yeah ! Please let us know!

e.n335 · 01-23-2010, 08:26 PM

Any news ?

Thanks,
Eugen

Former_Boosted_IS · 01-25-2010, 05:56 AM

Piggies bias the wideband so that is useless then. Second BT log samples are simply way to slow if you really want to see any useful wideband info. I suggest buying one if you really want to monitor A/F ratios.

e.n335 · 01-25-2010, 07:07 AM

Quote:

Originally Posted by Former_Boosted_IS

Piggies bias the wideband so that is useless then. Second BT log samples are simply way to slow if you really want to see any useful wideband info. I suggest buying one if you really want to monitor A/F ratios.

Have one (LM-1). I just hate the idea to weld a bung into the DP. However, seems to me I have to

.

Thanks,
Eugen

Prince ///M · 01-25-2010, 07:18 AM

Quote:

Originally Posted by e.n335

Any news ?

Thanks,
Eugen

I'm waiting for a friend that will perform some tests on BMW power kit with Active processor on top of (no wideband modification on the contrary of other piggies).

I'll let you know as soon as I have some news.

Former_Boosted_IS · 01-25-2010, 07:24 AM

Quote:

Originally Posted by e.n335

Have one (LM-1). I just hate the idea to weld a bung into the DP. However, seems to me I have to

.

Thanks,
Eugen

The DPs are a huge hastle to remove. Why not just put it in the midpipe? The response difference is basically negligable.

e.n335 · 01-25-2010, 08:52 AM

Quote:

Originally Posted by Former_Boosted_IS

The DPs are a huge hastle to remove. Why not just put it in the midpipe? The response difference is basically negligable.

I thought the LM-1 has to be pre-cat between turbo and primary catalysts ( I have 200 cell catalysts in the DPs ).

Former_Boosted_IS · 01-25-2010, 09:00 AM

Quote:

Originally Posted by e.n335

I thought the LM-1 has to be pre-cat between turbo and primary catalysts ( I have 200 cell catalysts in the DPs ).

I don't know too much about how the 200 cel cats will affect things unfortunately. I would call and ask the manufacturer.

scalbert · 01-25-2010, 09:19 AM

You can measure post catalyst but it will show slightly leaner than actual.

12-30-2009, 02:37 PM	#1
Prince ///M Second Lieutenant 4 Rep 200 Posts Drives: Join Date: Dec 2007 iTrader: (0)	A/F ratio Please could someone indicate the parameter to be logged on bt in order to get the a/f information from o2 widebands and the convertion ratio (eg from volts to stoichiometric)? Thanks in advance.
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12-30-2009, 09:56 PM	#2
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	I need to know this as well.
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01-02-2010, 04:16 AM	#3
Prince ///M Second Lieutenant 4 Rep 200 Posts Drives: Join Date: Dec 2007 iTrader: (0)	I probably found them. - Lambda nominal value bank 1-2. In addition the wideband signals are: - voltage lambda probe in front of catalystic converter bank 1-2. At the moment I don't have the conversion factors from volts to stoich but I think they are only a division and an offset away
	Appreciate 0 Quote

01-02-2010, 04:19 AM	#4
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	Great ! Please keep me informed. Thanks, Eugen
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01-02-2010, 04:27 AM	#5
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Yeah ! Please let us know! __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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01-23-2010, 08:26 PM	#6
e.n335 Moderator 270 Rep 4,481 Posts Drives: e93 ///M3 DCT, 07/2009 Join Date: Feb 2007 Location: Switzerland, ZH iTrader: (0)	Any news ? Thanks, Eugen
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01-25-2010, 05:56 AM	#7
Former_Boosted_IS Major General 307 Rep 5,175 Posts Drives: 4 Wheels Join Date: Aug 2007 Location: Planet Earth! iTrader: (15)	Piggies bias the wideband so that is useless then. Second BT log samples are simply way to slow if you really want to see any useful wideband info. I suggest buying one if you really want to monitor A/F ratios.
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01-25-2010, 09:19 AM	#13
scalbert Major General 153 Rep 5,780 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	You can measure post catalyst but it will show slightly leaner than actual.
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