Reading Lambda on LM-2 when Stoichiometric is 14.2 in tune

[Protec]

I'm working on getting myself educated to start using my LM-2 and I know my {B3671} Stoichiometric AFR is set at 14.2 (Nothing but +/- E10 here)

The LM-2 is factory set to show Stoich of 14.7 and if I want to read Stoich in my setup I would need to change the LM-2 to other Volt readings from what I gather. Is reading Lambda the same way? or when you read lambda it does not matter?

In searching there is a ton on information on the LC1, but I cant seem to find the correct correlation to the LM-2

Thanks in advance,

John-

[joecar]

Yes, correct, Lambda is the same regardless of fuel used.

To see Lambda in the scantool, the pid CALC.AFR_LM11 has to be divided by 14.7 (which is the stoich AFR value setup in the LM-1).

[Protec]

Joe,

Ok, so this file

"{CALC.AFR_LM11.AFR}/{GM.AFR}"


Should be changed to read: "{CALC.AFR_LM11.AFR}/{14.7}" or "{CALC.AFR_LM11.AFR}/{GM.AFR}/{14.7}" ???

and then copied an inserted into the calc_pids.txt file??

From the old tutorial I'm not to modify the sae file, just obtain the pid information from there correct?





Sorry for to question - This is my first edited pid.......

john-

[joecar]

The measured Lambda is: "{CALC.AFR_LM11.AFR}/{14.7}"

The BEN correction is: ""{GM.EQIVRATIO}*{CALC.AFR_LM11.AFR}/{14.7}"

[joecar]

"{CALC.AFR_LM11.AFR}/{GM.AFR}"

the problems with that are these:
- LM-1 has a programmable stoich AFR which is usually (but not always) 14.7,
- GM.AFR depends on the value of B3601 (which can be set to other than 14.7),

this is why GM.EQIVRATIO is used (it is 1/lambda).

[joecar]

"{CALC.AFR_LM11.AFR}/{GM.AFR}/{14.7}

That is incorrect, it would have to be this (assuming B3610 is set to 14.2 for E10):

"{CALC.AFR_LM11.AFR}/{GM.AFR}/14.7*14.2"

but by using GM.EQIVRATIO you can reduce that to this:

"{GM.EQIVRATIO}*{CALC.AFR_LM11.AFR}/{14.7}"

[joecar]

...

From the old tutorial I'm not to modify the sae file, just obtain the pid information from there correct?

...

Hi John,

DO you have FlashScan V1 or V2...?

Do you have the serial comms (null modem) cable connecting your LM-1 to your V2...?

[Protec]

Joe,

Very much appreciate the information.

I'm using V2 and I made the serial cable that connects the LM-2 to the V2..... Its an LM-2...

Let me know if you need anything else.

Best,

John~

[Protec]

the problems with that are these:
- LM-1 has a programmable stoich AFR which is usually (but not always) 14.7,
- GM.AFR depends on the value of B3601 (which can be set to other than 14.7),

this is why GM.EQIVRATIO is used (it is 1/lambda).

Joe,

I don't have B3601 rather B3671 (Stoichiometric AFR) and its set to 14.20

[joecar]

Joe,

Very much appreciate the information.

I'm using V2 and I made the serial cable that connects the LM-2 to the V2..... Its an LM-2...

...

John,

With the serial comms wideband input into V2, you can simply use the calc_pids.txt from the Calc.VET tutorial...

you would use the pid CALC.WO2BEN for pure wideband tuning

( you would use CALC.SELBEN for mixed wideband/LTFT tuning )