LM1 Calibration

[INTHERED]

I have read a few threads be none of them seem to completely cover the topic of setting up the LM1 with the Hptuner Pro EIO. Check this out:

Right now I have my LM1 Analog Output 2 signal wired to EIO pin 1 and the Analog Output 2 ground wired to EIO pin 5 using a shielded cable and a 1/8 inch stereo plug from Radio Shack. The Ground is connected to the shield and the signal is the center conductor.

Using the LM1 software I programmed my LM1 Analog Output 2 for a 0v-5v swing where 0v is set to an A/F ratio of 10 and 5v is set to an A/F ratio of 20. Under the advanced tab I set the LM1 sampling rate to 1/6 of a second. In the Hptuner scanner I inserted the LM1 PID from the AUX list into the EIO input 1 cell.

Is this the correct way to setup the LM1 and the HPtuner Scanner for datalogging accurate A/F ratios ?

Thanks >>>>> INTHERED

[bc3tech]

i thought LM1 went directly into a computer for logging via LogWorks... no?

[Bill@HPTuners]

sounds about right to me.

[bullygoat]

I have read a few threads be none of them seem to completely cover the topic of setting up the LM1 with the Hptuner Pro EIO. Check this out:

Right now I have my LM1 Analog Output 2 signal wired to EIO pin 1 and the Analog Output 2 ground wired to EIO pin 5 using a shielded cable and a 1/8 inch stereo plug from Radio Shack. The Ground is connected to the shield and the signal is the center conductor.

Using the LM1 software I programmed my LM1 Analog Output 2 for a 0v-5v swing where 0v is set to an A/F ratio of 10 and 5v is set to an A/F ratio of 20. Under the advanced tab I set the LM1 sampling rate to 1/6 of a second. In the Hptuner scanner I inserted the LM1 PID from the AUX list into the EIO input 1 cell.

Is this the correct way to setup the LM1 and the HPtuner Scanner for datalogging accurate A/F ratios ?

Thanks >>>>> INTHERED

What is the standard output that HPTuners has programmed for the LM1? I don't think it is 10 to 20 is it? If not you'll have to custome make an input to match how you've programmed the LM1.

Tim

[Bill@HPTuners]

yeah its 10-20

[bullygoat]

yeah its 10-20

Yeah, I looked it up and found that out. Only it's 10-20 in a voltage range of 1.0-2.0 volts.

Tim

[Bill@HPTuners]

Yeah, I looked it up and found that out. Only it's 10-20 in a voltage range of 1.0-2.0 volts.

Tim

um no, that would only give you a range of a/f between 12.0:1 & 14.0:1

10-20 & 0-5

the LM-1 predefined config is Wide Band O2 - LM1: result = volts / .5 + 10

5v/.5=10 + 10=20 afr@5v

[INTHERED]

um no, that would only give you a range of a/f between 12.0:1 & 14.0:1 10-20 & 0-5 the LM-1 predefined config is Wide Band O2 - LM1: result = volts / .5 + 10
5v/.5=10 + 10=20 afr@5v

This is what makes the forum so fun.

My LM1 A/F readings and the Hptuner LM1 readings differ by .2 to .5 is there an easy way to get everything to match up ?

Thanks >>>>> INTHERED

[bullygoat]

um no, that would only give you a range of a/f between 12.0:1 & 14.0:1

10-20 & 0-5

the LM-1 predefined config is Wide Band O2 - LM1: result = volts / .5 + 10

5v/.5=10 + 10=20 afr@5v

Just checking because the manual for the LM1 that comes with logworks says it's setup for a 1v-2v range. Didn't want the original poster to run into problems with incorrect readings.

Tim

[Bill@HPTuners]

yeah when you get it out of the box i believe thats how its setup...you need to change some of the stuff in logworks to get it "calibrated" correctly so its a 0-5v output.

[INTHERED]

I have the LM1 Analog Output 2 programmed for 0 to 5 volts but the Hptuner log sez the LM1 is reading 14.95 while the LM1 log sez its reading 14.7 so I have a difference of .25 A/F. So I was thinking of setting 0 volts to a 9.75 A/F ratio and 5 volts to a 19.75 A/F ratio on Analog Output 2 so that it would shift everything down by .25 A/F. Does this sound reasonable ?

INTHERED

[bullygoat]

If you have a steady .25:1 error, then yes. Mine has an offset of about .1V so I had to change my equation for my LC1 accordingly.

Tim

[spoolin]

I have the LM1 Analog Output 2 programmed for 0 to 5 volts but the Hptuner log sez the LM1 is reading 14.95 while the LM1 log sez its reading 14.7 so I have a difference of .25 A/F. So I was thinking of setting 0 volts to a 9.75 A/F ratio and 5 volts to a 19.75 A/F ratio on Analog Output 2 so that it would shift everything down by .25 A/F. Does this sound reasonable ?

INTHERED

What ive done is I have made a custom PID in HPT. The default LM1 formula is V/.5 +10. So if you are off .2 or .3 then try something like v/.5 + 9.7 or 10.3. Then check to see if it matches.

[popeye55]

can some one tell me whats to do, i have the LM-1 and i set it to sample 1/6 rate. it's connected with the red wire to #1 and the braided shield wire to #5 and the white not used, it's plugged into my mpvi pro. i got the histo set up i believe and working, but the afr is way off, commanded will be 14.6 the wide band shows 14.7 but the histo shows 10. to 12. so it's reading way rich. is something wrong or do i have to adjust something??? seems my wideband is way off.

[popeye55]

anyone?

[popeye55]

common i am sure that there is some with a LM-1 that had this happen, i am not sure how to adjust to get them matched

[Bill@HPTuners]

can you post a scan log for us popeye?

[PurplePiss]

I created a custom pid. Then set the LM-1 to 0-5v, 10-18 AFR. In HPT, set the PID to volts/.625 + 9.68(or your offset).

[INTHERED]

anyone?

Did you program the LM1 Analog 2 output for 0 volts = 10 A/F and 5 volts = 20 A/F ?

[PurplePiss]

Did you program the LM1 Analog 2 output for 0 volts = 10 A/F and 5 volts = 20 A/F ?

First off, make sure you do a Free air calibration.

0v = 10 afr
5v = 18 afr

Set the LM-1 in logworks to 2.5 = 10afr and 2.5v = 18 afr. MAKE SURE AFTER YOU PROGRAM THE LM-1 YOU POWER IT COMPLETELY OFF. Then setup a custom pid in hpt. Set it to volts/.625 + 10(10 for now). Set the decimal places on the AFR histogram to 3 decimal places. Goto the scanner and open the pid and go to configure. Leave the window open so you can change the numbers. If you close it and start the scanner, it won't let you go to user config for some reason. Then start the scanner, it should be around 14.000. If it isn't, start moving the "10" up and down. Stop the scanner, then restart it so you get an accurate average. You can make changes and see it change right away, but it won't be accurate because its averaging in the previous values. Hope that makes sense. Anyway, you just found the offset. Go back into LMProgrammer and set it to 0v = 10 and 5v = 18, THEN TURN THE POWER OFF ON IT AFTER YOU PROGRAM IT. Go for a drive in closed loop and see if your around 14.6-14.8 all the time. You could set the PE AFR to 12.0 across the board and see if it goes to that number when you mash it.

I do have a few questions myself for everyone; if you set it up this way, will the AFR near the upper and lower limits be innacurate away from the middle 14.7? Has anyone figured out the 50 points to put in the make a curve instead of a straight line?