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> 2056 Ljet, MPG?
Geezer914
post Apr 14 2023, 03:11 PM
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Running a 2056 with Ljet, 9550 cam, 50mm TB, and 9:1 CR. Getting just over 15 mpg. Plugs look good, slight tan. Thoughts?
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GregAmy
post Apr 14 2023, 03:13 PM
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Seems way low, John...unless you're driving that thing like a Ricer...I'm getting 27-28 high end with the D-Jet induction on Microsquirt,a dn I was doing mid-20s or better with the stock D-Jet before that.

Sure you're not leaking/losing fuel somewhere? Does it sit a lot and you lose vapors...?
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StarBear
post Apr 14 2023, 03:16 PM
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@Saigon71 ? (IMG:style_emoticons/default/blink.gif)
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VaccaRabite
post Apr 14 2023, 03:31 PM
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You should be getting at least 25mpg. I suspect you are way rich.

Reading plugs only tells you what the plugs were doing at idle right before the engine turned off. You need to test with an O2 meter.

Zach
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BeatNavy
post Apr 14 2023, 03:45 PM
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Any other issues that could cause this? Really bad alignment, brakes grabbing, bad bearings, etc....? And to Greg's point, what kind of driving are you doing?

I agree that an overly rich mixture is the most straightforward answer, but other things can contribute.
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jim_hoyland
post Apr 14 2023, 03:46 PM
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Ave 20ish; got 25 yesterday driving to Idyllwild
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Geezer914
post Apr 14 2023, 05:51 PM
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I'll hook up the O2 meter and see where I am at. I know 14.2 is optimum, but is 13.7 better for performance?
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emerygt350
post Apr 14 2023, 06:32 PM
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Can't trust the O2 in that way. Particularly with a type 4. It's more like "where does it tend to be and is it rich enough"

I got 8 mpg last tank in my Mustang because of bad behavior. Kind of proud my CFI 302 could actually use that fuel.

If you were having a ton of fun, 15 should be a good number for that motor. If you were trying to be a fuel miser, yeah, something is up.
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wonkipop
post Apr 14 2023, 09:21 PM
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i got a stock unmolested 1.8 L jet.
best i get at cruise on highway at a steady 65mph is 28mpg. (converting to your US measures of gallons). thats cruising. no gassing. no curvy hilly twisty roads.

i reckon its double that around town.
i wouldn't say my right foot is made of concrete but you know, i do press it down every now and then. but not ridiculous.

15mpg around town would be pretty close i believe to what i get in the horrible urban glue i am forced to negotiate.
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worn
post Apr 14 2023, 10:18 PM
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This is only relevant in terms of energy needed to move the car. I was getting about 30 mpg last summer with my 3.2 six. Driving for thousands of miles at about 70-80 mph. These little cars are so great!
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r_towle
post Apr 14 2023, 10:44 PM
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Back when I was doing deep learning of all the ways to mess with djet, I got 48 mpg in my 1.7
Tires, brakes, bearings all matter.

That said, you should be able to get 20-25 with carbs
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Geezer914
post Apr 15 2023, 08:31 AM
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Taking Clay's advice and reset the the large wheel in the AFM back to the original setting. Tank is full, so I'll see what happens. Thanks for the reply's (IMG:style_emoticons/default/popcorn[1].gif)
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brant
post Apr 15 2023, 08:39 AM
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QUOTE(Geezer914 @ Apr 14 2023, 05:51 PM) *

I'll hook up the O2 meter and see where I am at. I know 14.2 is optimum, but is 13.7 better for performance?

Those numbers are not good for an air cooled motor
Stoich is 14.7:1
And you will cook your motor quickly with that ratio

Do some research
At redline you want around 12.5:1 AFR

I routinely get 32 mpg in my 2.0/djet
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anderssj
post Apr 15 2023, 09:09 AM
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2.0 with Elgin cam, dells, Mahle Euro P/C set, Bosch 050, and over the last four years I'm averaging 18.8 mpg on mostly country two-lane roads. Seldom into 4th gear, let alone 5th. Probably driving 5/10ths to 7/10ths.

If I'm just cruising around using 4th and 5th gears I get 24mpg or better.

Hope this helps.
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Geezer914
post Apr 15 2023, 09:24 AM
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With an AFR gauge hooked up, what AFR reading should I be shooting for cruising at 3000 rpm?
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emerygt350
post Apr 15 2023, 11:33 AM
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If it is telling you the truth, 14 would be fine. A modern car would even be around stoich at that point. In a type 4 I would feel safe anywhere between 13 and 14. I would verify with a plug check though.
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Geezer914
post Apr 15 2023, 11:54 AM
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AFM set back to normal, hooked up the AFR meter and took it out for a spin. At 3k in 5th gear the AFR was 12.3! Came back to the garage and lowered the fuel pressure from 34lbs. to 30lbs. Take it out again and now the AFR reads between 13.7 and 13.8. at 3k in 5th gear. So I think I'm good to go, just have to check the MPG. Thoughts??? (IMG:style_emoticons/default/piratenanner.gif)
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DRPHIL914
post Apr 15 2023, 12:14 PM
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QUOTE(Geezer914 @ Apr 15 2023, 11:24 AM) *

With an AFR gauge hooked up, what AFR reading should I be shooting for cruising at 3000 rpm?


i am at 13.5 , WOT 12.7, (d-jet, 2.1)
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DRPHIL914
post Apr 15 2023, 12:17 PM
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QUOTE(Geezer914 @ Apr 15 2023, 01:54 PM) *

AFM set back to normal, hooked up the AFR meter and took it out for a spin. At 3k in 5th gear the AFR was 12.3! Came back to the garage and lowered the fuel pressure from 34lbs. to 30lbs. Take it out again and now the AFR reads between 13.7 and 13.8. at 3k in 5th gear. So I think I'm good to go, just have to check the MPG. Thoughts??? (IMG:style_emoticons/default/piratenanner.gif)

perfect
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Chris914n6
post Apr 15 2023, 12:58 PM
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Are you using 1.8 injectors or 2.0?

2.0 will likely flow more per squirt which would cause richness.
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