ECO Hubs Who needs 3:07 gears?

aw113sgte said:

Fuel economy update (with eco hubs)
2007 A1R m1096 with 20ft shipping container.
30,400 lbs
Speed 60-65mph
Stock ECM map
5.82 mpg

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GeneralDisorder said:

Try 50-55 instead. You're junk is big and heavy. Congrats on your sizeable gear

Tire pressure? I run the M1088 settings so 81 psi.

Guessing at that weight the best it will get under ideal conditions is probably around 8 or just under. 7.8 to 8.2 would be believable for that combo if all the stars align. But without the hubs you would probably be even lower than your most recent calculations.

From my experience it does seem that the MTV takes a hit of 1-2 MPG or so from the extra axle gear out back. The 4x4 trucks do the best with some guys reporting 11-12. I myself was around 10.2 but I should update that test. It's been a while.

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Ronmar said:

Yea thats a lotta weight… have you taken individual axle weights? Balance too far outta wack will really show tire wear running a single CTIS pressure across all 3 axles…

”Your junk is big and heavy” Waaaay TMI…

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GeneralDisorder said:

Try 50-55 instead. You're junk is big and heavy. Congrats on your sizeable gear

Tire pressure? I run the M1088 settings so 81 psi.

Guessing at that weight the best it will get under ideal conditions is probably around 8 or just under. 7.8 to 8.2 would be believable for that combo if all the stars align. But without the hubs you would probably be even lower than your most recent calculations.

From my experience it does seem that the MTV takes a hit of 1-2 MPG or so from the extra axle gear out back. The 4x4 trucks do the best with some guys reporting 11-12. I myself was around 10.2 but I should update that test. It's been a while.

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Keith Knight said:

Ok, almost 6,000 miles running echo hubs with original gears, 3126 engine with a 330 hp program. Note: I weigh 27,800 lbs
Oh and I had previously driven over 25,000 miles with the 3:07/ high speed gears and NO echo hubs.
Update…..
Love the noise reduction
Love knowing everything is spinning half the RPM’s

Hate that the exhaust braking only slows me down to 20 mph before they disengage. They were effective down to less than 10 mph before. Which means I’m using the brakes way way way more. Also while going down hill, I mean down mountains with single track dirt forest roads I have to manually shift the transmission into 1st gear to keep from riding the brakes constantly to maintain a nice controllable speed.
Also while going down 10% grade mountain roads on paved roads the exhaust brakes don’t keep me in a safe speed like they did before with the echo hubs.

FUEL Mileage everyone wants to know.
With 3:07/high speed gears I got over 25,000 miles averaging 6.5
With original gears and echo hubs I’m getting about 8-8.5 mpg. Not what I hoped for but it is what it is. It’s better! Also my max speed is 60 mph. I personally aim for 50-55 mph in 6th gear which is the optimal mpg while monitoring the instant MPG according to the ECM. I’m able to live monitor it. Oh and forget ever using 7th gear….got to 80mph and it still never shifted to 7th gear.

Hate that it starts from a stop in 2nd gear. Makes for a sluggish start.

Which brings me to my big question? Any possible way to reprogram the transmission to use 1st gear in all situations? Different ECU from a different vehicle? Just spit balling….

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GCecchetto said:

Any of you folks running 14R20's with ECO hubs? Contemplating switching over, but a little concerned about further raising the gearing. Also curios about longevity and reliability of the Goodyear ORD's for those with experience with them.

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AKPacker said:

I've been running that combo for ~7000 miles now and have been fairly happy with it. I only drove my truck maybe 5 miles with the original tires and hubs so I can tell you my experience with the Ecohubs/14.00R20s, but don't have a good basis for a comparison with the stock tire size.

With the original 275 hp tune it drove great for the most part and the only time I was left wanting was on long steep uphill grades where it would shed a ton of speed and struggle a bit, it is significantly better now with 370 hp. Acceleration around town and in traffic was fine but not inspiring, also much improved with 370 hp. I haven't done any low speed crawling yet so I can't comment on how that is affected by the taller tires.

The speedometer required a 5.6% adjustment to line up with GPS speed: (62618ppm/1.056)/2=29649ppm with Ecohubs. Fuel mileage has been great for what it is, I average around 10mpg. They seem to be wearing well, and at this rate I'd expect to get 30000+ miles out of them.

Minor issues:
*The spare doesn't fit well in the carrier as can be seen in the photo below. The crane arm will eventually need to be extended 3" to 4" for the tire to fit flush with the side of the box.
*They are a bear to balance, although that isn't unique to these tires and is likely also due to wonky steel wheels.
*They are quite loud at highway speeds, although again that is not unique to these tires. Tire noise is now the loudest sound in the cab since I've quieted down other parts of the truck with insulation and the Ecohubs.
*The Goodyear OTR tires sold by ColonyTire on Ebay are blemished/factory seconds with tread repairs. When I bought my set they weren't advertised as such, so I had to negotiate with them to get some money back. It looks like they are properly advertised now. The repairs do seem to be holding up ok so far.


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