 LM-1 Data log, MPS/AFR |
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| rfinegan |
 Feb 13 2026, 01:24 PM
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#1
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Senior Member  Group: Members Posts: 1,176 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region 
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I wired up the O2 and the LM-1 with a new Tach channel (I need a TPS for throttle position/load next)
I think this a a cruise speed , with a little more throttle in near the end. The full stop (3/4 to wot)seems to be about 12.1 or so ( I am liking that ok) NOT SEEN ON THIS SESSION MPS looks lean on cruise/ part load Head temp gets hot on light cruise about 60 MPH This tool seems to have a lot of features for the $$$ and still works well for being so OLD! Maybe some decel/over run here too on the graph, I need t make notes on the recordings, not EZ for 1 person that is the driver.  |
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| rfinegan |
Feb 13 2026, 01:30 PM
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#2
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Senior Member Group: Members Posts: 1,176 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region
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or maybe use a old school vac gauge. :think
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| rfinegan |
Feb 13 2026, 01:40 PM
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#3
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Senior Member Group: Members Posts: 1,176 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region
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QUOTE(rfinegan @ Feb 13 2026, 02:30 PM)  or maybe use a old school vac gauge. :think A little tweek to the part load (middle Screw CCM Loosen) 1/8 turn to start? I just need to get her road worthy, While I work on my Clewette/ Electromotive TechGT 2056 |
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| Ninja |
Feb 13 2026, 03:52 PM
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#4
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Member Group: Members Posts: 133 Joined: 25-September 25 From: Granbury Texas Member No.: 29,004 Region Association: Southwest Region |
15.8 would bug me. I'd prefer 13.8-14.5 cruise and I'd want to know if 13.8 reduced cylinder heads temps versus 14.5.
3/4 throttle I'd want 12.5 or lower, once again I'd be looking at temp data here too. In my book 16 is "lean burn" beginning. On a water-cooled engine I'd want port injectors, modern digital FI, COP, and knock sensors. I would not be looking for power here, just fuel economy. I wouldn't run 16-1 on anything built in the 70s without fully updating everything and I'd still be more conservative and lean towards the rich side of things. |
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| Ishley |
Feb 13 2026, 03:56 PM
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#5
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Member Group: Members Posts: 316 Joined: 4-October 21 From: Clarendon Hills Il Member No.: 25,957 Region Association: Upper MidWest
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I integrate O2 data that I capture on my PC with 123+ Distributor data captured on my phone simultaneously . You have to have the blue tooth version of the 123. Using time stamps form each source I can connect the data. I chart it and can see where I go lean and look at the other variables for why... and can make tweeks to the MPS from there.
Just another option to fill in the picture using data. |
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| brant |
Feb 13 2026, 04:12 PM
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#6
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914 Wizard Group: Members Posts: 12,137 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Set your redline mixture for 13 or 13.5
Then mid range Too lean right now. |
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