LM-1 and gauge
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LM-1 and gauge
Lately, I've been using the LM-1, and recently purchased a digital gauge from Dynotune the splices into the output wires on the LM-1. If I understand correctly from Innovate's user manual, one of the outputs is already programmed to read out the proper a/f ratio. However, it is reading around .5 point different than the lcd readout on the box. Am I doing this right, or do I need to program the other output, too?
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Is the gauge setup to read 0-1 volts of 0-5 volts? you need to find out what voltage the gauge expects, then use the innovate software to connect to your LM1 to make sure it's outputting the proper voltage range
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Potentially the issue is one of potential voltage offset between what the LM1 box is putting out (or thinks it is putting out) and the voltage that the gauge reads.
I saw a small offset from what my LM1 was putting out and what the software was reading, so I made an adjustment to the formula.
I set up the LM1 to output the same voltage regardless of AFR, basically you put the same # in the voltage box at both positions for the wideband channel. I did this 5 times, in steps of 1.0 volts - .5, 1.5, 2.5, etc. I then started the car and logged the voltage that was reading. It was off by a little bit, not much really, but I would rev the engine in the garage a little during logging just to make sure any alternator voltage effects were taken into account. I really did not see output voltage vary more than .1-.2 volts.
Anyway, then I made this little excel table that I used to derive a new wideband equation for. The function in Excel is LINEST.
Basically all it does is use the measured voltage and derive a new slope and intercept so that the AFR matches what the LM1 is trying to tell it. On mine, I measured less than .05 error, so although it didn't really need correcting once I had the formula I used it anyway
Hope this helps ! See attached file !
I saw a small offset from what my LM1 was putting out and what the software was reading, so I made an adjustment to the formula.
I set up the LM1 to output the same voltage regardless of AFR, basically you put the same # in the voltage box at both positions for the wideband channel. I did this 5 times, in steps of 1.0 volts - .5, 1.5, 2.5, etc. I then started the car and logged the voltage that was reading. It was off by a little bit, not much really, but I would rev the engine in the garage a little during logging just to make sure any alternator voltage effects were taken into account. I really did not see output voltage vary more than .1-.2 volts.
Anyway, then I made this little excel table that I used to derive a new wideband equation for. The function in Excel is LINEST.
Basically all it does is use the measured voltage and derive a new slope and intercept so that the AFR matches what the LM1 is trying to tell it. On mine, I measured less than .05 error, so although it didn't really need correcting once I had the formula I used it anyway
Hope this helps ! See attached file !
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You need to program one of your outputs to be
1.00v=10.00
2.00v=20.00
The DynoTune gauge needs an input of 1-2V not the 0-1v or 0-5v that is pre-configured as from innovate. Call us if you have qestions tonight at 1-978-562-6040
You should have gotten the installation instructions with the gauge, if you did not let me know and we can email them to you
www.dynotunenitrous.com
cheers
Dan
1.00v=10.00
2.00v=20.00
The DynoTune gauge needs an input of 1-2V not the 0-1v or 0-5v that is pre-configured as from innovate. Call us if you have qestions tonight at 1-978-562-6040
You should have gotten the installation instructions with the gauge, if you did not let me know and we can email them to you
www.dynotunenitrous.com
cheers
Dan