LSU4 Ipn vs lambda table

MoTeC supplied sensors, valves or wiring discussion

LSU4 Ipn vs lambda table

Postby r.hellenbrand on Mon Jun 29, 2009 8:46 pm

Dear,

Is the Ipn vs lambda table different for LSU 4.0, 4.2 and 4.9 sensors?
I now use the table generated after the conversion from ECU manager V2.3 to V3.5.

Thanks,
Ron
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Re: LSU4 Ipn vs lambda table

Postby RossB on Tue Jun 30, 2009 8:15 am

The table is the same for all sensor types. If you want to check that the table is correct check that it has values as shown in the help file:
Ipn -5.000 -4.000 -3.000 -2.000 -1.000 -0.500 0.000 continued...
Lambda 0.673 0.704 0.753 0.818 0.900 0.948 1.000 continued...

0.500 1.000 1.500 2.000 2.500 3.000 4.000
1.118 1.266 1.456 1.709 2.063 2.592 5.211
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Re: LSU4 Ipn vs lambda table

Postby r.hellenbrand on Tue Jun 30, 2009 4:52 pm

Hi Ross,

If I compare these values with the ones Bosch provides for the lsu4.9 sensor 0-258-017-025 they are way off.
See: http://www.bosch-motorsport.com/pdf/sen ... /LSU49.pdf

I also found values for the lsu4.2
See: http://www.not2fast.com/instrumentation ... nglish.pdf
They are also a little different.

Is this because they are not measuring in real exhaust gas?

I have also problems with the OEM BMW lsu4.9 sensors, they are very unstable (noisy).
The lsu4.9 sensor 0-258-017-025 is much less noisy!

Would it be possible to use the OEM sensors, or do I have to change to the 0-258-017-025 sensors?

Want to use the lsu4.9 ones because of looming issues (and lower heater current, I use injector outputs for the heaters), in the past I used lsu4.2 VW sensors (sometimes I get over current errors when they are cold).

Thanks,
Ron
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Re: LSU4 Ipn vs lambda table

Postby Martin on Tue Jun 30, 2009 9:05 pm

Hi Ron,


Yes the OEM BMW sensors work okay, but when you try and AIR CAL them they can be a nightmare. The cal number would sometimes change almost 500units per second and will also go negative

Because of this problem Ive moved to the Bosch 0 258 017 025 Bosch LSU 4.9 which works very well. Ive also found the 4,9s to be the most resistant to leaded fuels.

Where are you situated?
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Re: LSU4 Ipn vs lambda table

Postby RossB on Wed Jul 01, 2009 11:45 am

Ipn is Normalised Pump Current, not raw pump current. It has a correction applied to it which is dependant on the sensor being used as well as a gain based on the resistor calibration value. So we can use the same Ipn - Lambda values for all supported sensors.
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