lm1 and hpt different readings

[Alan 956]

I have my my lm1 programed like this 0v = 10 afr 5v = 18afr I just cant get hpt to read corectly, i would appreciate any help

[5_Liter_Eater]

Create a user defined EIO PID and assign it to your EIO input. The equation would be Volts/.625+10. This will get you very close and if there is still a discrepancy then adjust the 10 up or down. you shouldn't have to change the 10 more than 1/2 point.

[Alan 956]

Thats were im having the problems to get close i have to add 3 or more and then it doesent go lower the 13afr.

[5_Liter_Eater]

Are you using the built in EIO PID for the LC1 or your own user defined EIO PID? The built in LC1 PID uses this equation, which is wrong for how you have it set up:

Wide Band O2 - LC1: result = volts / 0.3324 + 7.35

Also, there are multiple outputs from the LC1, I would verify that the one you have going to the MVPI interface is configured how you expect it to be.

[Alan 956]

Im using the lm1 not lc1 and im using my own user defined EIO PID.

[5_Liter_Eater]

Where is the LM1's analog ground grounded to? The MPVI or a chassis ground?

Can you post screenshots of your LM1 analog output configs and custom PID?

[Alan 956]

I got it to work the computer i was using to program the lm1 must of not been compatable i used a computer at work and reprogramd it and it worked perfectly thank you for your help. =)

[5_Liter_Eater]

It may or may not be the computer you used. I have heard of the Innovate WB controllers losing their config before.

[Joe_G]

Create a user defined EIO PID and assign it to your EIO input. The equation would be Volts/.625+10. This will get you very close and if there is still a discrepancy then adjust the 10 up or down. you shouldn't have to change the 10 more than 1/2 point.

Bill I'm having fits too on this. In my PID I have to add 13.6 to get 14.7 cruise to be more or less equal on HP Tuners and the XD16 in the car. But at WOT the XD shows 12.3 and the HP tuners is 15.x...

I'd been using the Volts/.5 per this thread...

Duh.

While typing this I decided to RTFM....we made a mistake an hooked up the yellow (simulated narrowband) output to my ac switch. That's why adding 13.6 worked to get 14.7...narrowband on the LC1 gives .1v output at 15.0 afr, 1.1v at 14.0 afr and thus .5 at 14.7 - so .5/ .5 = 1 plus 13.6 so it was showing 14.6-14.7 at 14.7... that's what narrow bands do. DUH!!! No wonder it was getting 15+ readings at 12.3 real AFR...the narrowband output is 1.1 at 14.0 so 12.0 was off its scale.

I'll swap for the brown wire tomorrow and that shoud get me squared up. Maybe my mistake will help someone else figure this out before they pull out their hair like I was doing.

[Joe_G]

Arrgh. No love for me. I'm about ready to rip this thing out by the wires.

I am sure we got the yellow and brown wires backwards. The 7701 sensor reads between .4v and 1.1v so it's reading narrowband.

The wires are a pain to get to, no problem the plug to program the lc-1 is easy to get to I'll just program the lc-1. Hook up my old laptop with a serial port, it reads the sensor with LM Programmer no problem, I set output 1 to equal output 2 (wideband) and set the sensivity to 1/3 of a second.

fire the car up and the calibration is shot to hell. Even the XD 16 won't read, its off the scale. Why do they make that thing recalibrate every time you program it? It's a huge pain to pull the WB out of the pipe.

So I decide to blow a fan up my exhaust for an hour, followed by blowing the leaf blower up my cutouts for several minutes. Reprogrammed it again to have the analog outputs the same, and it calibrated ok and the XD 16 reads.

But still .4 to 1.1 v out of the AC (7701) sensor on the table view!

It seems like the LC-1 didn't take the programming. Every time I hook it up to the computer it seems to be back to factory settings.

Is there some sort of trick to making it take the programming???

[Joe_G]

OK success.

Here's the deal. I was programming output 1, then going to output 2, then back to output 1 and it would reset. I just changed output 1 to have a range of 0V for 7.35 AFR and 5V for 22.39 AFR and hit program...then exited the program. That worked.

Of note, the PID proper calculation for an LC-1 is not what is above. It's:

VOLTS / (VOLTAGE RANGE/DEVICE RANGE) + (MINIMUM VALUE OF DEVICE READING) = AFR

The LC-1 goes from 0-5 v and has a range of 7.35-22.39 AFR. So the equation is:

VOLTS / (5/15.04)+7.35 or

(VOLTS / .332)+7.35

Hope this helps somebody.

[5_Liter_Eater]

Joe, as I mentioned in the CF thread there is no goo reason to have that wide of an AFR range. Tighten it up to gain resolution and fend off voltage/ground offset.

[vince99frc]

Are you guys saying using the built in HPT PID does not work? I hooked mine up exactly like HPT says in the help and it will read 13 something for about 15 to 20 seconds and go straight to 21.54.

I programmed the LC-1 for air/fuel and everytime I go back and check it is back to lambda. What am I doing wrong?