LM-1 Box and HP Tuners EIO don't read the same...
06-27-2005, 11:39 AM
#1
LM-1 Box and HP Tuners EIO don't read the same... I finally got my LM-1 Connected to my HP Tuners EIO.
When I programmed the LM-1 Analog 2 output, I used 0.000 & 5.000
I calibrated the WB O2 in free air before I tried to use the HP Tuner EIO. Once I got everything hooked up and the scanner to "see" the WB, I turned everything on and with the sensor in free air still, the LM-1 box reads 20.7 A/F but my HP Tuner scanner is showing 19.7 A/F. I have an O2 bung in my y-pipe, just need to get this taken care of first before I start.
Why is there a difference of "1"? Shouldn't the scanner in HP Tuners read the same as what the LM-1 box shows?
What am I doing wrong?
Bill
When I programmed the LM-1 Analog 2 output, I used 0.000 & 5.000
I calibrated the WB O2 in free air before I tried to use the HP Tuner EIO. Once I got everything hooked up and the scanner to "see" the WB, I turned everything on and with the sensor in free air still, the LM-1 box reads 20.7 A/F but my HP Tuner scanner is showing 19.7 A/F. I have an O2 bung in my y-pipe, just need to get this taken care of first before I start.
Why is there a difference of "1"? Shouldn't the scanner in HP Tuners read the same as what the LM-1 box shows?
What am I doing wrong?
Bill
06-27-2005, 11:52 AM
#2
TECH Senior Member
do you have the ground wire hooked up too?
You have it setup for 0-5V 10-20 AFR correct?
since 20.7 is outside the 10-20 range I'm guessing the LM1 is truncating the output somehow...
You have it setup for 0-5V 10-20 AFR correct?
since 20.7 is outside the 10-20 range I'm guessing the LM1 is truncating the output somehow...
06-27-2005, 12:16 PM
#4
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The LM-1 output is programmable and so is the EIO
input transfer curve. They need to be on the same
page. My LM-1 seems to forget the prior mapping
between uses. Don't know about the EIO, whether
it gets saved in the config or not. Just make sure
they are both saying the same thing when you set
up.
input transfer curve. They need to be on the same
page. My LM-1 seems to forget the prior mapping
between uses. Don't know about the EIO, whether
it gets saved in the config or not. Just make sure
they are both saying the same thing when you set
up.
06-27-2005, 01:43 PM
#7
TECH Senior Member
i've always just used the built in LM-1 PID. you may want to see how close the display on the LM1 and the scanner display are when the value is within range... 20.7 AFR is outside the range that the LM1 is programmed to output...
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06-27-2005, 01:57 PM
#8
Well, riddle me this...
I'm using HPT v1.7. It has the LC-1 PID. When I commanded a 13.0 AFR, I was seeing around a 13.0 AFR being logged. When I commanded 14.7, I was seeing close to that, but it does jump around a lot. Is that proof enough? I can't get my laptop to recognize the LC-1 for some reason, so I don't have much of a choice but to believe what I'm being told by HPT.
I'm using HPT v1.7. It has the LC-1 PID. When I commanded a 13.0 AFR, I was seeing around a 13.0 AFR being logged. When I commanded 14.7, I was seeing close to that, but it does jump around a lot. Is that proof enough? I can't get my laptop to recognize the LC-1 for some reason, so I don't have much of a choice but to believe what I'm being told by HPT.
06-27-2005, 02:06 PM
#9
Hmmmmmmmm...I guess I need to see how the LC-1 PID is set up in HPT. According to the directions for the LC-1, the analog output I'm using is linear from 1-2V, but covers 7.35-22.39 AFR. Guess I'd better not start tuning until I get that one figured out.
06-27-2005, 02:42 PM
#10
TECH Senior Member
^^^ Yea you don't want to use the 1-2 Volt... that's narrowband range... only 1 volt resolution for all those different AFRs
You want it to be 0 to 5 volts so you get the higher resolution .. (and it's linear)
You want it to be 0 to 5 volts so you get the higher resolution .. (and it's linear)
06-27-2005, 08:37 PM
#12
Alright, for those of you wondering about the LC-1 (since it is fairly close to an LM-1 in operation), here you go:
As it comes from Innovate, analog out 2 is set up to put out 0-5V, linear, representing 7.35-22.39 AFR. Apparently, the HPT Scanner PID labeled LC1 in version 1.7 is set up to read this.
For grins, I set up the output in the LC1 to be the same 0-5V, linear, but this time representing 10-20 AFR. The LC1 PID in the HPT scanner was reading about 4 points numerically lower. So I made a custom PID to read the LC1 (asked it to read the same as I programmed the LC1), and it shows what the original setup did. Somewhere around 14.7:1 at idle (actually, it is around 15.1:1 with my car since it is idling a bit lean). I'll get that fixed soon enough...
As it comes from Innovate, analog out 2 is set up to put out 0-5V, linear, representing 7.35-22.39 AFR. Apparently, the HPT Scanner PID labeled LC1 in version 1.7 is set up to read this.
For grins, I set up the output in the LC1 to be the same 0-5V, linear, but this time representing 10-20 AFR. The LC1 PID in the HPT scanner was reading about 4 points numerically lower. So I made a custom PID to read the LC1 (asked it to read the same as I programmed the LC1), and it shows what the original setup did. Somewhere around 14.7:1 at idle (actually, it is around 15.1:1 with my car since it is idling a bit lean). I'll get that fixed soon enough...
