Hey Guys,


Does anyone here have this setup? The reason I ask is I just lifted my LLY and I'm really surprised by both the mileage and power decreases.


I used to get 16 mpg (on paper not DIC) and had torque for days. Now I get about 13 mpg and a very noticable decrease in torque.


I'm wondering if the Power and Torque generated by the Edge will overcome the loss from the bigger tires. Or should I start looking for some gears?


I plan on towing my 7,000 boat to Cabo from San Diego and I need all the torque I can get.


You feedback would be very appreciated.


thanks.


GG

Well, I got 35's and also the LB7. To answer your question, yes I did lose a bunch of my horses and also a good chunk of my mileage. I'm thinking the Edge will give you back a fair portion of the power but doubts on the mileage. I don't know if this is an option for you, but running 285's will bring your mileage back in-line again. I ran 285's for a while and they were great, just not big enough for my liking so I went to 315's and mileage went in the toilet. I don't care though, fuel is cheap and I make lots of money. http://www.dieselplace.com/forum/smileys/Cool.gif


Gears will bring your mileage up again too, but in order to offset the cost between your gears and the extra you spend on fuel, you'd better be doing a pile of driving and for a long time!!!


I've done lots of math and this is what I came up with! Good luck and have fun with the Edge, mine's gonna be here soon!!


-Zorganov

Zorg,


Thanks for the comeback.


Please keep me posted after you install the Edge.

No prob dude, just a warning though, Edge might actually be a while, just working on the stacks right now, gotta save up for a little while first http://www.dieselplace.com/forum/smileys/Cry.gif

I've got the LB7 and the Edge/ Attitude. I bought mine from the dealer with 6' lift and 35's. I've never driven a stock Duramax. When I put the edge on itwas a whole different animal. Lots of power and torque. Allison is still burnin in second in second gear. You regret the edge and I get 16 or so mpg, my wife gets better

Gotlift,


Thanks for the info.


Sounds like I should hold tight until LLY Edge is out.


SHould be any day now.


Anyone else?

I have a 04 LB7, 285/75 and I used the Bullydog Power Pup Programmer. I am using the 75 HP setting and I love it. Lot's of power now and increased 3.8 mpg. Also corrected my speedo with it.

i have the exact setup you described, you do lose the power and meileage, but the edge on level 2 puts you right about back to stock in mileage and power. I run on level 5 all the time so mileage sucks and power is incredible. I am looking to do gears when i have the extra $, but first up is a trannyhttp://www.dieselplace.com/forum/smileys/Cry.gif good luck -Jeff Edited by: wsucowboy

In terms of mileage, are you correcting for the tire size? Remember, the DIC thinks you still have 245s on. Also, it is better to check your mileage the old fashioned way rather then rely on the DIC. In fact, when you get the Juice the DIC won't read mpg correctly anymore.


BTW, I have a Rancho 4" lift and 295s (33s), and the Juice Attitude. I just went form 285s to 295s, and mileage seems about the same: 14ish in town and 20ish on the highway. Best highway mileage was 21.9 with 285s and Juice on level 4 in the fall time.

Guys,


Thanks for all the info. WSU, I'm glad to hear you are back to about stock power. That's all I'm looking for. Why do you want to re-gear?


AFP - I am accounting for the larger tire size. Some tanks I'm only getting 225miles before correction of 15%. Not too good. Plus the power drop off sucks...


Anyone else?

Even with Juice, guys that tow heavy complain about loss of power with larger tires. The consensus seems to be 33" (285-295/75s) max with stock gearing. However, even with a 33" tire, you need about 4.10 gears to get it back to the same ratio as 3.73s with 245s.


I liked mine a lot when it had 265s with 90 HP Juice. That would be 295s with 3.9 gears or 315s with 4.1s.





Blaine

I have BFG 33x12.5R16.5 ATs. With the Juice/Attitude, it tows my 7K# boat just fine. I do a lot of driving through the TX hill country and it has yet to downshift out of 5th and my EGTs have never been above 1200 pre-turbo in level 1.


Since I didn't tow very much in stock form, I don't know what's happened to mileage, but it has plenty of towing power in level 1 alone.


BTW, I think the increase of unsprung weight (wheel/tire combo) hurts mileage just as much if not more that tire diameter increase.

Thanks for all the info. WSU, I'm glad to hear you are back to about stock power. That's all I'm looking for. Why do you want to re-gear?


Why do I want to regear? When you lift and add the bigger tires you effectively lower you gearing. So with my tires right now I running something like 3.05's or even 2.72's. to get back into the factory powerband and dimensions I need to put in a set of 4.11, if I go any bigger w/ tires than I would do 4.56's. I guess I want to do it because I liked where the power came in when the truck was at stock height and when I do change them it'll only make the truck faster!! plus I have heard horror stories about the Furds blowin up trannys because they added huge tires and didnt re-gear, it puts more stress on the tranny!

315's (H2's)


no lift, just torsion bars cranked.


Predator 120 tune.


19 MPG on the freeway with the cruise set between 60-75. "Pen and paper"


When I put the H2's on, I did feel a definate loss of power, but once I added the predator all that was behind me.

I have an 04 lb7 with 6" lift and 35's. I bought the truck like this so not sure what kind of milage I had before. I have edge w/attitude and pull a 9,000 lb boat with no problem. 80 mph up hills in level 3. DIC is showing 12 mpg pulling boat, but edge attitude shows mph is off about 10 when you are going above 60. Probably around 13-14mpg pulling 70 + mph.


Once they make a programmer for your truck I would do that, exhaust and intake and forget about the gears.

I have an 04 lb7 with 6" lift and 35's. I bought the truck like this so not sure what kind of milage I had before. I have edge w/attitude and pull a 9,000 lb boat with no problem. 80 mph up hills in level 3. DIC is showing 12 mpg pulling boat, but edge attitude shows mph is off about 10 when you are going above 60. Probably around 13-14mpg pulling 70 + mph.











Hmm, I pull the same load with the same setup and I only get about 10mpg towing on level 2. AND if I pull 80mph uphill the EGTs go through the roof. ....Whats your trick?

I have the exact setup you're asking about, plus exhaust, intake and attitude monitor. I ran it for a few thousand miles stock, then put the lift, tires, exhaust, intake and edge on all at the same time. There is definately more power now than stock in any level 2 and above. Low power boost makes big difference here also. I originally had it running in 4/4, but have since lowered it to 3/3. Now when I take the J/A off to bring it in to the dealer, it feels like such a dog! Mileage if anything is better than stock by 1-3 mpg depending on juice level when not towing. I never towed in stock so I don't have any info there. I installed the superlift truspeed to correct the speedo.


I have one slight issue when towing. I can't seem to find the right gear/speed in order to keep the EGT's down and the speed up. I have towed in T/H mode, both level 2/2 and 1/1 with similar results. Around here there are lots of hill and mountains, and trying to tow in 5th gear creates high EGT's pretty quick around 65-70. When you lock out overdrive the EGT's go down quick but then I'm at around 2300-2500 rpm, no good for mileage. IMO, the problem results from the fact that with the bigger tires, I am now only at about 1700rpm when cruising in 5th at about 68mph. Add 10,000lbs towing, it creates serious stress trying to hold the mph uphill in 5th and I get the EGT's. No problem in overdrive lockout, EGT's come down but so does the mileage. I guess that's the reason for regearing?


BTW, all my towing mileage is between 4000-5000ft above sea level. That could have something to do with the high EGT's.

HD4Fun,


Exactly what I was looking for.


It sounds like the J/A gives you back all you lost and more.


I have had several lifted trucks and I'm used to the drop in power. But honestly this truck has lost more power than any of my others. I didn't expect such a big drop off in torque because it is a diesel.


I'm just trying to decide if I should get my torque back via gearing or J/A or both.


I think I'm gonna wait for the J/A and then make other changes if I'm not satisfied.


I was just really bummed when the truck had to downshift pulling my buddies 5k# boat up a SMALL grade.


I guess I'll just have to be patient....


thanks for all the feedback. Keep it coming.


GG

Gato Gordo,


You will find with the J/A that the truck doesn't want to downshift anymore. She'll have plenty of power to go up the hill in 5th, and will even accelerate up it, but the EGT's get up there quick as well. I would quickly get to about 1100 degrees, then sort of slowly move up to 1250 and sit there. Once you get close, the J/A backs down. It never even got to 1260, but with the general consensus being nothing sustained over 1250, I would let it sit there for maybe 10-15 seconds, then back off the throttle, or lockout the overdrive - as soon as I would force it to 4th gear, EGT's dropped straight down to under 1000. It may have been ok in 5th, might have just been me getting nervous. Straight roads or little grades I had no problem in 5th at all.


Overall I am totally impressed. I can say it's a world of difference from my 5.3 gasser she replaced! I love my truck, these are just my observations.

I got 37s with the juice/attitude. It does help signaficantly with the power loss. I tow a 7,000lb. boat aswell and it helps a lot.

Mine turned into a gutless pig when I put the 35's on. It was fine for running around empty but I found that I had to really push the pedal to the floor to climb grades without downshifting (6-spd standard). The 125hp Juice/Attitude gives it WAY more power than it ever had with stock tires, I've been able to burn rubber in 4th gear on dry pavement! The stock tires/dmax might be able to do that on wet pavement but that's it.


Go for the Edge and set it on level 2, you'll forget all about the tires. Go to level 5 and buy stock in BF Goodrich!

Alright. I'll just wait for the Edge.


I hate waiting!


Thanks for all the feedback.