Motec and Lambda sensor

[Wolf_Tm250]

Hello !

I enabled Lambda option on my M4Pro, so I could supply a lambda signal.

My Lambda sensor kit is a Tech Edge 2A0,
so could I supply the Narrow Band simulated output or a Wide Band linear output to the ecu.

The M4 lambda sensor setup menu' gives me these choices:

- user defined
- Narrow band or Motec AF meter
- Motec wide band
- NTK wide band ( requires resistor divider )

Any advice would be very appreciated.

Thank you.

Cheers

[Stu-]

If you have the capability then just supply the ecu with signals from the wideband sensor itself. This will always be better than a narrow band output. The downside of running the wideband all the time is that the sensors themselves do have a "life expectancy" and wont last forever, especially if your running av or a leaded fuel. Probably not the best idea as the sensors can be expensive to replace. Get the tune as close as you can with the wideband, then swap to a narrow band for day to day running.

[Wolf_Tm250]

If you have the capability then just supply the ecu with signals from the wideband sensor itself.

Ok, perfect,
but which signals ?

The ECU wants LA+ and LA- signals from the sensor, and I have a Bosch LSU4 WB sensor, 5 wires:



http://wbo2.com/lsu/default.htm

Thank you.

[fivebob]

If you have the capability then just supply the ecu with signals from the wideband sensor itself.

Ok, perfect,
but which signals ?

The ECU wants LA+ and LA- signals from the sensor, and I have a Bosch LSU4 WB sensor, 5 wires:

The M4 cannot control a LSU4 sensor directly it uses an LSM-11 which is a 4 wire sensor. You can attach the LSU through your Tech Edge and set the Motec to narrow band so you can log the voltage. However I don’t think you can use the Quick Lambda or Closed loop functions with this setup. Contact support@motec.com.au and they should be able to help you with this.

BTW if you had a spare Voltage input you could have achieved the same thing without the expense of a Lambda upgrade, which makes the M400 a much better choice in the long run.

[Wolf_Tm250]

The M4 cannot control a LSU4 sensor directly it uses an LSU11 which is a 4 wire sensor. You can attach the LSU through your Tech Edge and set the Motec to narrow band so you can log the voltage. However I don’t think you can use the Quick Lambda or Closed loop functions with this setup. Contact support@motec.com.au and they should be able to help you with this.

BTW if you had a spare Voltage input you could have achieved the same thing without the expense of a Lambda upgrade, which makes the M400 a much better choice in the long run.

Hi fivebob,

I'm not really interested in Quick Lambda or Closed loop functions, but I'd like to connect it to M4Pro for logging the lambda signal WITH Motec logger.

Do you think it won't be possible to use the WBlin TechEdge output and program the user defined option in Motec's lambda sensor menu' ?

Thank you !

[fivebob]

I'm not really interested in Quick Lambda or Closed loop functions, but I'd like to connect it to M4Pro for logging the lambda signal WITH Motec logger.

Do you think it won't be possible to use the WBlin TechEdge output and program the user defined option in Motec's lambda sensor menu' ?

Yes, and that should allow the use of the Quick Lambda and Closed loop functions if you wanted them (though they're not that useful).

However an easier option may be to set the M4 to Wideband and use the output from the Simulated Narrowband Output (NBsim - Pin 6) which according to the documentation on the Tech Edge site, is the same as the LSM-11 that the Motec uses.

If that doesn't work then according to my calculations the Motec calibration table for the Tech Edge Linear Wideband Output (WBlin - Pin 4) should be as follows.

50- 0
55- 0
60- 0
65- 56
70- 132
75- 207
80- 282
85- 357
90- 433
95- 508
100- 583
105- 658
110- 734
115- 809
120- 884
125- 960
130 and above - 1024

[Wolf_Tm250]

I'm not really interested in Quick Lambda or Closed loop functions, but I'd like to connect it to M4Pro for logging the lambda signal WITH Motec logger.

Do you think it won't be possible to use the WBlin TechEdge output and program the user defined option in Motec's lambda sensor menu' ?

Yes, and that should allow the use of the Quick Lambda and Closed loop functions if you wanted them (though they're not that useful).

However an easier option may be to set the M4 to Wideband and use the output from the Simulated Narrowband Output (NBsim - Pin 6) which according to the documentation on the Tech Edge site, is the same as the LSM-11 that the Motec uses.

If that doesn't work then according to my calculations the Motec calibration table for the Tech Edge Linear Wideband Output (WBlin - Pin 4) should be as follows.

Wow fivebob, thank you !

Another beer for you next time you'll be in Italy !

But do you think it should be better to use WB output, or there will be not a real difference in quality with NBsim ?

[fivebob]

Wow fivebob, thank you !

Another beer for you next time you'll be in Italy !

No problem, glad I could help, pity I don't drink beer or I'd take you up on the offer

But do you think it should be better to use WB output, or there will be not a real difference in quality with NBsim ?

Either should work ok. The Motec is already calibrated for the LSM-11 internally so you don't need to mess with the calibration tables, but the user defined table would be more accurate in the 0.6-0.8Lambda range(10-12:1AFR) because of the output curve of the NBsim pin.

Either way you should verify that readings are the same on the Motec and the TechEdge to make sure the calibrations are correct.

[Wolf_Tm250]

No problem, glad I could help, pity I don't drink beer or I'd take you up on the offer

Ok, let's go for a bottle of red wine then !



Thank you.