345/75/16's

[80BajaBound]

gas mileage

I just got home from dropping the off to pick up her rig. Round trip was about 40 miles (30 of which are highway). I set my cruise at 70 mph on the freeway and after I pulled into my driveway I snapped this photo....


It's not 15 mpg, but it sure as hell ain't 10 mpg. I'm even running these tires at 37 psi. Please excuse the scangauge rats nest - I'm situating the interior now...

 

[DSRTRDR]

Lookin' sweet Nolen, but I liked your FJ40s better. You must be getting old.

 

[wngrog]

Nice mileage. Incredible actually.

 

[Nay]

Nice mileage. Incredible actually.

Well, the scanguage estimates mileage. You go pure highway, and it has some tendency to read a bit high on our applications if you plug in the actual pump numbers filling up at the same pump every time.

 

[80BajaBound]

Well, the scanguage estimates mileage. You go pure highway, and it has some tendency to read a bit high on our applications if you plug in the actual pump numbers filling up at the same pump every time.

My scangauge resets every time I turn the truck off. The longer I drive the more accurate the average. I'm not mechanic or pretend to be one but I assume the scangauge measures how far ive gone and divides it by the amount of fuel used to calculate our MPG??? I would think only the DTE (distance to empty) would rely on those data points, but not in this instance. Again - I could be wrong as this is not my area of expertise.

Back to these tires - After just 1k I can already see uneven wear on the front 2 tires. Any suggestions on how to correct this? I've already had a tire shop set the toe - which didn't do much.

 

[Nay]

My scangauge resets every time I turn the truck off. The longer I drive the more accurate the average. I'm not mechanic or pretend to be one but I assume the scangauge measures how far ive gone and divides it by the amount of fuel used to calculate our MPG??? I would think only the DTE (distance to empty) would rely on those data points, but not in this instance. Again - I could be wrong as this is not my area of expertise.

Back to these tires - After just 1k I can already see uneven wear on the front 2 tires. Any suggestions on how to correct this? I've already had a tire shop set the toe - which didn't do much.

The scangauge cannot measure fuel used - it is taking your inputs (4.5L 6 cyl engine) and estimating. Every time you fill up, you need to use the same pump and enter in the exact amount of fuel used (the scanguage will present you its estimate). When it is over or under, you can then adjust and this over time will fine tune the setting to your actual driving conditions. You could technically trick the scanguage into showing 20 mpg simply by under reporting fuel consumed and then entering in the necessary adjustments to correlate to its estimate.

I have mine pretty well pegged, but I it will still read a bit high on pure highway miles and a bit low on pure city miles. Having said that, I can pretty consistently get 13.5-14 mpg in relatively flat conditions cruising at 65-70 mph with 37" tires and 5.29's, and this is at high altitude.

 

[Layonnn]

The scangauge cannot measure fuel used - it is taking your inputs (4.5L 6 cyl engine) and estimating. Every time you fill up, you need to use the same pump and enter in the exact amount of fuel used (the scanguage will present you its estimate). When it is over or under, you can then adjust and this over time will fine tune the setting to your actual driving conditions. You could technically trick the scanguage into showing 20 mpg simply by under reporting fuel consumed and then entering in the necessary adjustments to correlate to its estimate.

x2...

 

[Box Rocket]

Nice to see you back in an 80 again Nolen.

truck looks great with the new tires.

 

[Bob_Garrett]

Got a set of the 345s mounted today at Discount Tire, even though they were sure that they wouldn't fit. The fronts just touch the front and rear of the fender well, which may be caused by the 1" spacers. Will have to try it without them.

 

[arndog123]

Nice. What lift are you running?

 

[Bob_Garrett]

front - OME 850J + 1" Mr Gasket spacer
rear - OME863J + 20mm spacer

 

[julstirn]

Looks great, I have trouble finding these sizes though.

 

[KimoSabe]

mostly on back order, TireRack.com should have them starting early next month.
Tire Search Results

 

[Bob_Garrett]

I got mine at Discount Tire. Took them about a week to locate a set. They said that BFG did not have any available at that time (2/5).

 

[wngrog]

Well I finally got my 4" rear spacers from Man-a-Fre. They were on backorder. 4+ stuff is the best, but the guy who makes it is on his own time clock.

Anyway, in prep for the final "rub test" I took the rear mudflaps off and trimmed the inside of them and cut the "flap" portion off right under the bulge. I keep the clean, finished look, but take away the part that always gets backed over. When you back over the mudflap on a rock it tends to yank the flap and the fender flare clean off the truck.

I have done it twice on other 80s so lesson learned...

I have a nice V ditch on the road in front of my house. I have found these things test out the flex best over a ramp. It will full stuff the front and rear at the same time and if it is deep/steep enough, you can carry the opposing tires. (that is if the truck wont full flex out)

My 80 is no ramp champ. I have regular length OME shocks and the swaybars attached. It sees mainly road use and I am building it for mild family wheeling and Moab type overnights so I am not looking for a rock machine. With dual lockers, carrying a tire is not that big of a deal anyway.

On to the pictures.

Driver's side rear tucks in perfectly and the 4" bumps make it all work just right. Nothing touches but the inside of the tire on the upper inner wheelwell. That is great as it is a nice flat, smooth surface and it can rub all day long and won't hurt anything.

1/2" to spare on the rear flaps

Tire fits like a glove

Fronts are about the same, they have a bit more room than the rears

NOT a ramp queen for sure

The passenger side rubs some on the rear. Not sure why it rubs and the drivers does not. I took 3 or 4 runs at the ditch and it was the same each time.

You can see the rub on the passenger rear hear. Not much I can do about it. Hope I don't rip s*** off.

 

[ShottsUZJ100]

You now could gain A LOT by adding L-shocks and lowering the top shock mounts. Stability and articulation would increase VERY notably.

 

[hakalugi]

...

Off to get the right bumpstops and I will report back.

can you share source and part #?

I rubbed once a few weeks back, but my mind was on other things. Now that i've cleaned up the fenders/flares with touch up paint, I'd like to keep them healthy. flaps are already removed. Looking under my rig, i have more travel between axle and stock bump stops than I do between my tires and fender flares - so like you, with e-lockers, i'd like to limit up travel a bit.

Thanks.

(I'm running 37 x 12.5 KM2's on 17" Sequioa/Tundra wheels, OME-J springs with 1" (?) front spacer)

 

[wngrog]

You now could gain A LOT by adding L-shocks and lowering the top shock mounts. Stability and articulation would increase VERY notably.

I think I will be OK for what I have planned for this truck. I really went cheap on this set of modifications..

What I really want to do is L shocks all around. I know for sure my rear droop is almost nil right now with my current setup.

 

[wngrog]

can you share source and part #?

MAF 4+Plus 80 Series Bump Stop

Post up some pics of your truck. I would like to see what you have. My tires (from the BFG site) are .4" smaller but 1" wider.

 

[hakalugi]

MAF 4+Plus 80 Series Bump Stop

Post up some pics of your truck. I would like to see what you have. My tires (from the BFG site) are .4" smaller but 1" wider.

thanks for the link. I don't have any action shots - just a profile:

and head-on via this attachment. your 16" version definitely shows more sidewall area.

I'll go take some snaps in a bit, I drove it into the 'city' today, I don't usually do that.