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 Problem with LM-1 
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Joined: Sun Aug 18, 2013 10:03 pm
Posts: 168
My old LM-1 use to display the A/F ratio on the unit itself in real time. Now all of a sudden it doesn't show up. It records and plays back fine. Any one know how to get it back? I skimmed through the manual and didn't find anything about it.


Sat Mar 28, 2015 9:13 pm
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Joined: Fri Feb 08, 2013 2:37 pm
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Does the display show anything at all? Perhaps you could re-flash the firmware. You can program the analog out to show the A/F in volts and connect it to a digital voltmeter. 10/1 (A/F) = 1.0V and 20/1 = 2.0V. Shift the decimal point one place right and the voltage is the A/F.


Sun Mar 29, 2015 1:27 pm
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I'll go out and make sure what is does and does not show. Will be firing the car up for the first time since pickling it for the winter. I don't think that it is bricked or anything like that as I can record, play back, and calibrate as usual. I'm sure it's something I've done.... it always is. LOL!


Sun Mar 29, 2015 4:27 pm
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Joined: Sun Aug 18, 2013 10:03 pm
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Sorry, didn't get to start the dragster until today. Here is a pic of the LM-1 display while the engine was running. In the right corner it used to display real time A/F ratio. Now it just says AFR.

Image


Last edited by tech 2000 on Thu Apr 02, 2015 3:55 pm, edited 1 time in total.



Thu Apr 02, 2015 3:52 pm
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Looks like it's reading Lambda, whats the problem?


Thu Apr 02, 2015 3:55 pm
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It has been displaying the AFR in the gas scale in the right corner where it now reads AFR. I don't recall changing anything in the box. What #'s should I be looking for using Lambda? Using Lambda, it doesn't matter what fuel is being used? I'm using alky and reading on the gas scale as per Scott Smith. Don't know why he suggested that but that's the way I've been doing it. Shooting to be in the 12.2 to 12.8 on gas scale.


Thu Apr 02, 2015 4:44 pm
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Low to mid 80's to start, may end up little higher.


Thu Apr 02, 2015 11:40 pm
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14.7 is considered to be the stoichiometric ratio of gasoline and air. 14.7/1 is the “gas scale” equivalent of 1 lambda.

The “gas scale” is 14.7 multiplied by the lambda number.

14.7 x .87 = 12.8
14.7 x .85 = 12.5
14.7 x .83 = 12.2


If you want to bother with it you can connect the LM-1 to your laptop and use LM Programmer to reset the fuel type.

Pages 11 and 12 in these instructions. http://www.innovatemotorsports.com/supp ... Manual.pdf

It is probably best to leave it be and learn to think in Lambda because that is the universal mixture ratio number no matter what fuel is used. It is like riding a bicycle or swimming, easy once you get the hang of it.


Fri Apr 03, 2015 1:43 pm
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Joined: Sun Aug 18, 2013 10:03 pm
Posts: 168
Duh!... I must have changed it to Lambda without realizing it the last time I was in the box. When your not using something regularly, one tends to forget a lot about it. LOL! I believe I will leave it reading Lambda. Thanks!


Mon Apr 06, 2015 5:55 pm
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Joined: Sun Aug 18, 2013 10:03 pm
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I have had trouble with erratic logs since I have had this box although some were better than others. I have went as far as installing a 12 volt power source to the box. It has been installed in three different race cars and the same thing. Here is a log from last night.
Attachment:
5-3-15.log [253.46 KiB]
Downloaded 10 times
The rpm trace is unreadable. I'm just frustrated with the time and money spent to figure out the problem. Any help would be appreciated.


Sun May 03, 2015 9:54 am
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