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post #16 of 27 Old 04-19-2013, 08:56 AM Thread Starter
Gage56
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Quote:
Originally Posted by idiot magnet View Post
Are you adjusting your mpg since your speedometer is not correct after adding the larger tires?
When I had my 4 cyl YJ I got 18-19 mpg.
i have a 6cyl and no how do i figure that out ?

also i only ended up getting 125miles from a full tank once it hit the half mark the rest went real quick


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post #17 of 27 Old 04-19-2013, 09:08 AM
JBTJ
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Originally Posted by idiot magnet View Post
You should check out the 15 to 20 gallon simple fix for the 4cyl YJ's. Very easy to do and less trips to the gas station.

Are you adjusting your mpg since your speedometer is not correct after adding the larger tires?
When I had my 4 cyl YJ I got 18-19 mpg.
x2 You need to change out the speedo gear in the transfer case to adjust for the larger tires installed. Until you do your MPG's and speed will be off. You are actually getting better MPG's than you think.
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post #18 of 27 Old 04-19-2013, 09:10 AM
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The easiest way is to use a GPS to track your actual miles driven. You can also see what % your mph are off. I would bet you're at least 10% off running 33's. That would mean you have 121 miles not the 110 showing. It's also good to know your actual mph if you don't want a ticket. When your speedo is showing 55 mph you're actually doing over 60, enough to get you stopped.
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post #19 of 27 Old 04-19-2013, 09:15 AM Thread Starter
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yeah i know if im doing 55 its more like 75mph

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post #20 of 27 Old 04-19-2013, 10:41 AM
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I would think with 33's you're probably closer to 20%, that wuld be 66 mph when showing 55, if your're really doing 75 when showing 55 that's almost 40%. Either way it makes your MPG a whole lot better than the odometer is showing.
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post #21 of 27 Old 04-19-2013, 11:58 AM Thread Starter
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ok im uploading the vid's now but 55=75mph and i reset the odm on both and the jeep said 2.8 miles and the gps said 3.8 miles


Quote:
Originally Posted by JBTJ View Post
x2 You need to change out the speedo gear in the transfer case to adjust for the larger tires installed. Until you do your MPG's and speed will be off. You are actually getting better MPG's than you think.
i would but they dont make a gear for 3.07 gears with 33" tires , Plus i have a set of axles with 4.10's that is going in when i do the rebuild

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post #22 of 27 Old 04-19-2013, 12:39 PM Thread Starter
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post #23 of 27 Old 04-19-2013, 02:01 PM Thread Starter
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post #24 of 27 Old 04-19-2013, 03:58 PM
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Wow! I didn't think 33 would be off that much, you are almost at 40% in mph and mpg so your 110 miles is closer to 150. So now you just need to add about 38% to the odometer total and divide that by how much gas you used. I'd like to hear your numbers. I have the 4.0 with 3.73 turning 32x11.5 I can get 18mpg if I drive easy, my last trip over the mountains and cruising at 70 through the desert got me 15+
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post #25 of 27 Old 04-19-2013, 04:05 PM
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Originally Posted by pete1991YJ View Post

FYI my old 1979 K20 (old-school 3/4 ton 2500) got 8 MPG regardless of what you did. I put in a 396. 4.10 gears, 14-bolt detroit and a 4-speed.

Going downhill with a tail wind, it still got 8. Uphill, it got 8. In 2 wheel drive it got 8. In the snow it got 8.

It got 8.

The new trucks are nice.
I have a 99 F250 4x4 7.3 diesel 6 spd. It gets 20 mpg. In town it gets 20, on the highway doing 65 it gets 20, run 80 mph and it gets 20. Running uphill, downhill, with the wind, against the wind it gets 20mpg. Funny thing is, hook 7500 pounds to it and it gets 22 mpg!
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post #26 of 27 Old 04-19-2013, 04:26 PM
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Originally Posted by Gage56 View Post
ok im uploading the vid's now but 55=75mph and i reset the odm on both and the jeep said 2.8 miles and the gps said 3.8 miles




i would but they dont make a gear for 3.07 gears with 33" tires , Plus i have a set of axles with 4.10's that is going in when i do the rebuild
Yes they do. You need a 26 tooth gear and you can buy it here for about $40 and have it in 2 days

4.10 will require a 36 tooth gear.

I bought several so I know this for a fact.

http://www.transmissioncenter.org/sp...e_and_jeep.htm
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post #27 of 27 Old 04-23-2013, 07:59 PM Thread Starter
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So a little update,

I ran a half a tank of gas to E and got 122miles logged on the Gps from it so i guess that's not too bad seeing as i got 110 logged on the Odm earlier ! Also did i mention this motor has about 240k miles on it

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