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> AFR vs MPG
Geezer914
post Nov 9 2023, 01:19 PM
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Running a 2056 with 1.8L L-Jet fuel injection. AFR is set at 13.1. MPG is around 20 miles per gallon. Does this look right?
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VaccaRabite
post Nov 9 2023, 01:22 PM
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Thats about what I used to see as well.

I'm sure it could be tuned for more economy at the expense of power.

Zach
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930cabman
post Nov 9 2023, 03:07 PM
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QUOTE(Geezer914 @ Nov 9 2023, 01:19 PM) *

Running a 2056 with 1.8L L-Jet fuel injection. AFR is set at 13.1. MPG is around 20 miles per gallon. Plugs are a little dark but not fouled. Does this sound right?


Is this in town MPG?

My 2056 with twin 40 IDF's gets a bit over 30MPG at 75MPH highway. No idea what the AFR is, plugs look ok. Funny I have a new LM-2 in the box, can't figure out how to get it going
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StarBear
post Nov 9 2023, 03:27 PM
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QUOTE(VaccaRabite @ Nov 9 2023, 03:22 PM) *

Thats about what I used to see as well.

I'm sure it could be tuned for more economy at the expense of power.

Zach

(IMG:style_emoticons/default/agree.gif) At idle On standard 1.8 FI. Planning on changing our nearly original injectors and checking/adjusting valves (many years overdue) to lean a bit further (running 10.0-12.0) at rpm. Might tweak the AFM a bit more but pretty near point where it hasn’t helped.
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emerygt350
post Nov 9 2023, 06:22 PM
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That plug looks nice to me. Where is your o2 sensor?

I get almost 20 in town and 28ish on the highway but I drive like gas doesn't matter in town. I can't help it ... Maybe 270 miles on 13 gallons (I don't trust my fuel gauge yet so I always fill up as it drops below 1/4 tank).

On my 2056 djet I am at 14.2ish cruising and between 11-12 on WOT. My O2 is right after the 3 and 4 combine in my ansa (before the muffler).
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Geezer914
post Nov 9 2023, 07:47 PM
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My 02 sensor is in my Triad muffler.
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Krieger
post Nov 9 2023, 11:38 PM
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Looks good. I wouldn't go any leaner.
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930cabman
post Nov 10 2023, 06:20 AM
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QUOTE(Krieger @ Nov 9 2023, 11:38 PM) *

Looks good. I wouldn't go any leaner.


Exactly, I like to see my plugs darker. Detonation is one of the worst events that can happen in an engine
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Porschef
post Nov 10 2023, 03:44 PM
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QUOTE(Geezer914 @ Nov 9 2023, 03:19 PM) *

Running a 2056 with 1.8L L-Jet fuel injection. AFR is set at 13.1. MPG is around 20 miles per gallon. Does this look right?
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Interesting, I’m running the same setup. Also right around that AFR# and very similar mileage numbers. I always thought it would be a little better but I’m willing to sacrifice mpg’s for engine longevity.

It’s not a DD so I live with it (IMG:style_emoticons/default/beerchug.gif)
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Geezer914
post Nov 10 2023, 04:17 PM
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Sacrificing some mpg for performance. 20mpg and it's a blast to drive, I can't complain.
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Chris914n6
post Nov 10 2023, 06:09 PM
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Could be better. A stock 2.0FI is like 25-30. My 3.0FI was 24-29 mpg @ 90 mph.
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Geezer914
post Nov 10 2023, 06:33 PM
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I am running Len Hoffman RS heads with larger valves and a 50 mm throttle body, so not as efficient as a stock 2.0.
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emerygt350
post Nov 10 2023, 07:34 PM
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I mean, theoretically... You are moving the same weight so it shouldn't take more fuel unless you are driving it inefficiently. I know I am. Just try and miser your 2056 around. I just can't do it. I am always reaching into the throttle....
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Geezer914
post Nov 10 2023, 08:04 PM
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I try to keep the RPMs above 3K as much as possible.
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emerygt350
post Nov 10 2023, 08:07 PM
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Exactly
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Chris914n6
post Nov 10 2023, 09:43 PM
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QUOTE(Geezer914 @ Nov 10 2023, 04:33 PM) *

I am running Len Hoffman RS heads with larger valves and a 50 mm throttle body, so not as efficient as a stock 2.0.

Air + gas = HP. I've got 190 hp & 205 tq and get 24 mpg around town. Granted I don't have to push as hard to be fast, but it's still a formula that is consistent. A non-track car doesn't need the cooling effect of running that rich.
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