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Comments
Don't hammer me because I am telling you this, I don't care one way or the other what you guys get or what oil you use, just letting you know what is possible and what I did to achieve it. It isn't cheap to use these lubricants and filters but they do help with the fuel economy. If you would like more info, shoot me an email dave@azoil.com.
If anyone has any input or experience raising these trucks without the addition of a lift kit please let me know as well. Thanks, Dave.
P.S Typical mileage empty is about 17mpg.
I have had my 05 2500hd crew cab std bed 4x4 Duramax for 11 days now, and have switched out the pizza cutter 245/75/16's with BF Goodrich AT TA KO 285/75/16 which added about 2.5 inches. Also I added a leveling kit that lifted the front end up 2.5 inches, so that the top of the front wheel well matched the height of the rear. Overall the front has come up 5 inches, and the rear 2.5. It looks great! I did have to trim a very small amount of the front valence to keep tires from rubbing. Now that I have done that I am very happy. I have a friend with the exact same truck who put 295's on w/o the leveling kit, and he said his rub. Now that I have trimmed the front, I wished I had gone with the 305 or 315's because they are a little taller, and almost a full inch wider. FYI, the leveling kit was $275 installed.
I would like to hear some comments on some of these "programmers" or "chips" for the new 6.6 Duramax LLY (LLY = 8th digit in Vin is a "2"). I am not towing/hauling anything (except my own [non-permissible content removed]) and wondered if is worth the $400-$900? I am mainly concerened with increasing my fuel economy, but wouldn't be bothered with a little faster "off the line" reaction. I am concerened that I would need to worry about Exhaust Gas Temperatures, switching out exhaust systems to a wider diameter, installing a cold air intake system, digital in the cab monitors etc. Thanks in advance.
Stone G
did you change tires to a larger size?
If so, did you re-calibrate the tire size in the computer?
If you didnt re-calibrate, your truck is registering fewer miles on it that you are actually going, therefore decreasing the number of miles per gallon.
Thanks for the info. What kind of leveling kit did you use? That sounds like a great price installed. Also, if you will send me a personal email I will send you contact info for one of my AMSOIL accounts that markets a programmer. I use it in my 2003 and I am happy with the results. I believe he will take care of you on the price as well.
Dave
I did see a leveling kit for an 05 2500HD on ebay for something like $40.00
But it took Minco, something like 2.5-3.0 hours to install it, so in my opion it was $275 WELL spent.
Thanks again, I will look for the kit on ebay. Also, give Roland Trudell a call at 951-272-9090. He owns Rolling Big Power, a Diesel performance aftermarket parts dealer. Tell him that his AMSOIL Dealer, David Daniels referred you to him and that I said he would take care of you. I use the RBP programer and it does have the tire size issue taken care of along with some other goodies. I am very happy with the one he sent me.
Dave
lame looking. Can you get the 285s in blackwall? I'm not a big fan of raised
white letters. Sure, I know you can turn them around, but are there any true
blackwalls in that size/load capacity? Now have over 2,500 miles on my 2005
2500 HD with Duramax and it's a great truck, overall, save for the look of the tires.
Been a Ford man most of my life, but this Chevy is an extremely good truck.
I saw an 06 Ford F-250 SuperDuty today with their 20" rims/tires and it looks very, very good. Don't need to have 20's on my Chevy, just something that fills the wheel wells better than the pizza cutters that came on it.
I saw an 05 F250 Diesel King Ranch with the same kind of tires as mine on 22" at the Ford Dealership here in Tallahassee, FL (It did look awesome) You can always put larger tires/rims on the F250 than the 2500 due to the wheel wells being more rounded than squared as the GMC/Chevy's are.
I am sure there must a tire out there that size that is a blackwall only. The load range might be a different story. If you don't put a heavy load on the D range will work. All the tires I saw had the D range in the 285's at the tire shop. But if your like me you might not find a tread pattern that you like and blackwall. I have a 04 chevy duramax crew cab long bed and just put 285's on it. Cooper STT(white outlined). They have a pretty aggressive tread pattern, a little noisy. I had to lift the torsion bars 1", front end alignment, shaved a hair off the front valance and some cutting of the driver side inner fender well. I still have a little rub on the back of the fender well. The only reason that still rubs is the parking brake cable makes the fender well stick out just enough to rub at full crank of the wheel. I'm real happy with how the truck looks now. I had the pizza cutters before too. But a word of advise that all tire shops might not tell you. The stock 6.5" wide rims are not recommended. It can cause uneven tire wear and all other kinds of problems. You should get at least an 8" rim or so. They'll mount up on you stock rims but I wouldn't do it. Your just asking for problems down the road. Also I haven't recalibrated my speedo yet I'm going to get a programmer for that I still have the LB7 motor plus get some more power, I can already tell the difference in fuel mileage already. I would have to guess I'm getting about 16mpg. Before I was getting around 19mpg. A guy at work put 305's on his 02 duramax and had to do some more trimming on the valence and just a hair on the bumper along with what I did, and it looks real good too.
I would be interested in the programmer you mentioned as well. Mine is a 2004 Duramax LLY engine.
Pescador
05duramax
My 05 DM has 1,100 miles on it now.
With every tankfull my mileage gets better.
The last tankfull average was 11.8 mpg
I was getting as high as 17.5 mpg highway @60 mph
and now 13.5 in the city
The issue with towing is frontal area more so than weight, especially at those speeds. The horsepower it takes to overcome the drag varies as the cube of mph, so slowing down a little will save a lot. Drag varies linearly with the frontal area and the drag co-efficient so those are two important factors also.
I leveled my 05 Crew Cab D-Max 4x4 by replacing my torsion bar keys as well, and have experienced the same rough ride, expecially when going over a speed bump. It feels as if the front shocks are "topping out" when they are fully extended. Someone said I should replace the stock shocks with a longer Blistien shock. Any ideas? Also, did you notice your mpg go down after you leveled? I am trying to figure out how all these people here are getting such great economy, when I average about 11.5 in the city, 13.5 hwy, and 7.5 pulling a heavy load.
It is from the front end not slicing into the wind by being up an additional 2.5 inches, or the 285/75/16 tires?
truck quit 3 times in colorado, pulling under 10000 lbs. found bad injector module after 3 trips to dealer.
$1000 bill for gm. Same thing happening again. Starts combustion knock, severe, quits but restarts. Contacted GM 8 times to help, customer no service helpful not.
Have you replaced the stock exhaust or the air intake? I have been told by a diesel specialist to wait until I had between 5-10k on mine before I did the Edge or the Banks (I'm torn between them), but did say that when I do it, be sure to get a bigger exhaust (4").
I was told by an equal number of people that the cold air intake wouldn't show much of a difference over the K&N filter in the standard air box. So I just added the filter, and I might be getting about 1 mpg better.
Anyone have experience with it?
On this rig I also put removed the muffler and installed a split, dual exhaust w/5" chrome tubes.
Do you have the Alison 5 speed Automatic Transmission?
Are you using the cruise control? If not you could be a gas peddle thumper!
Are you using the tow button? The only time I use the two button is when coming down out of the hills to reduce using my breaks - if you always use the tow button it will take 5th gear out of play - that would account for you lousy mileage.
Lastly if all else fails use your warrantee and get GM to check it out.
and what is all this about injector problems? when does this happen? I'm headed to this hills this afternoon and will roll over 30K miles this trip please don't tell me I have something bad to look forward too. Also when not towing my milage holds 18-21MPG to and from work and around town in the meto area of DC.
also a news flash that I just came accros this morning - here I'll paste it:
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New August 25th: GM has announced a voluntary customer satisfaction program (#05546) for current owners of Duramax diesel equipped vehicles. In a letter dated August 2005, current registered owners were informed that they are eligible for one free fuel filter replacement, and GM has instructed their dealer network to perform this service free of charge through September 30, 2006. Please contact your local dealer to learn more about this free offer, or call 1-888-996-9463 if you need more information.
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Think I'll take advantage of this one, I'll need an oil change when I get back anyway.
I would love any help I can get here. I just don't like the look of the 245's. Also was always getting stuck in the back yard if it rained. Figured that the wider tire may make the truck "float" a little better in the mud.
Any help is appreciated.
VictoryCruiser
When I put on the 285's I found my speedo was off about 5 mph. I went to the dealer to recalibrate my speedometer and the dealership told me that Chevy will not recalibrate the speedo on duramax trucks. Stupid huh? But I seen a recalibration chip by superlift for about $190. In case your tire shop doesn't tell you you need to get an alignment after raising the torsion bars.
As for the speedometer: A difference of 2-3 mph faster than it shows. Not a big deal for me and I've never worried about it or inquired about an adjustment.
kcram - Pickups Host
Yes, I have the 5 spd. Allison Auto Trans, and I always use the tow button. I will have to try it without the tow button on to see what MPG I get. I guess I was just afraid of burning up the tranny if I didn't use it. I use cruise control alot and try not to stomp the gas pedal, I try to keep that to my race car.
The 6 speed seems great, shifts smoother than my 2004 did and definitely likes to go fast. I would suggest buying now and saving $10,000 and see what happens with the newer engine. Also, I hear that Bully Dog is already designing new performance parts and looking for testing people on their website.
I just ordered the Edge Juice with Attitude (will be using level 1 for better mpg's, but level 3 or 4 to embarrass these kids with "tuners?" from time to time) and it will be here in about 2 weeks, and will report on its efects.
I dont like the piller mount, and prefer not to drill holes on the dash to mount it.