Mar 31, 2015 at 09:34 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
wondering what others are getting for mpg on their c15 cats. I do local dump work with a 10 speed. We have trouble getting more than 4.5 mpg. I keep the filters clean and we are all caught up on maintenance. Is this normal?
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Replied on Wed, Apr 01, 2015 at 12:31 AM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I have never had a c-15 and never will. I talk to a lot of drivers and the twin turbo doesnt seem to ever get more than 4.1 to 4.5. I think the single turbo is a good engine, have heard it can get 6 most of the time.
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Replied on Wed, Apr 01, 2015 at 10:02 AM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
My twin turbo gets 5-5.4mpg. I've got an Ag. Solution power box on it and it runs Real Well. 1,024,780 miles . still running clean and cool. I pull an end- dump . open top some of the time.
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Replied on Wed, Apr 01, 2015 at 12:21 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
We run two c-15s in two 2007 Peterbilt 379s. Paid $600 to turn them from 475hp to 550hp. Both with 50'l 72" h 96" w timpte triple axle trailers. One has a pusher axle and hauls 94,000lbs and gets 5-5.5mpg on average. The other doesn't have a pusher and it gets 5.3-5.9mpg hauling 90,000lbs. Both are twin turbos and normally run 150mile round trips for loads and stay running while sitting in line. These are all stock trucks with no modifications.
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Replied on Wed, Apr 01, 2015 at 12:23 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Sorry forgot to say they both have 18sp transmissions.
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Replied on Wed, Apr 01, 2015 at 03:36 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I was getting 5.8-6.5 with mines pulling stepdeck 1,060,000 miles overhauled 400,000 miles ago single turbo 550hp 18spd 3.36 rears
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Replied on Wed, Apr 01, 2015 at 04:11 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I have a 2001 kW with a single turbo C-15 580 hp pulling a hopper or step and I average 7-9 but the foot feed has a lot to do with it c15s are really sensitive to bing in the throttle to hard on hills and even flat ground under a load take and drive it like you have an egg under the pedal for a couple days ams you'll see a difference on milage on any C15 or even the C16
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Replied on Wed, Apr 01, 2015 at 07:49 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
5 to 5.5 is our average. All pulling 78 high trailers. 70 or 75 MPH four lane and mostly 65 MPH two lane. They also spend quite a bit of time idling while waiting to load and unload. |
Replied on Wed, Apr 01, 2015 at 09:00 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I have a 01 c 15
In a 9900ix
Doing local dump work
6 all the time
The diesel doctor at effing ham Illinois
Programmed it for me
Before that I was the same as you
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Replied on Wed, Apr 01, 2015 at 10:45 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Does your truck have a primary fuel filter with a water drain at the bottom?if it does tighten it..they are snug..but not tight and will suck air.giving you a decrease in fuel economy...also if you do a lot of idling that will also burn a lot of fuel..something many don't even think about...how many times does that...ohhh I'll be back Ina sec...turn into a half hour? Best of luck..
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Replied on Wed, Apr 01, 2015 at 10:47 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I have 2 single turbo cats and 2 Accerts. I have tried other motors, wouldn't own anything but Cat. We pull 13' 6" high 102" wide floors with exterior ribs. I pull more wind than anyone and run more big pulls than most. Here is what I have learned. The more power you can trust your driver with the better the fuel mileage. I have put a lot of money over the last 2 years in Bully Dog parts on my trucks. No regrets. I have 1 single turbo in the mid 5's and one accert the same and we are getting better as we go. My trucks run 75 mph and we don't spare the pedal. I have been down in the 3's. I owe my fuel economy to Ray at Arizona Diesel Solutions. Ray can help you give him a call 623-826-1256. He can help you with parts and ECM programming, but if you are that low on MPG there might be other concerns. Lets make sure we are chasing the right problem. Just my Opinion.
Art Pfluger |
Replied on Thu, Apr 02, 2015 at 08:34 AM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I have an 04 Pete with a C-15 ACERT, 18 spd, 3.55 rears pulling a 50 ft tri axle Wilson hopper. I mainly stay in the MT, ND, SD, ID, and WY area but I am getting 6.8 mpg grossing 90k. When I was in NE last summer I was getting 7.2 mpg.
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Replied on Thu, Apr 02, 2015 at 10:58 AM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Im running an 07 W900L...with a Stage 1 PDI tune, 13 speed, 3.36 rears....I average almost 6 mpg pulling my dump trailer and well over 6 mpg (6.2 - 6.25) pulling my hopper. Before the PDI tune I average 5.3 to 5.5....PDI tune has done a world of good for me. Have a great day and be safe.
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Replied on Thu, Apr 02, 2015 at 11:15 AM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Has anybody had any luck using Pittsburg Power, J-Ball, or PDI with their manifold & turbo upgrade?
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Replied on Thu, Apr 02, 2015 at 07:48 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Thanks a lot.
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Replied on Fri, Apr 03, 2015 at 01:18 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Your injectors are bad. Get a set from Rochester diesel of Rochester mn. New injectors for a cat come out of Mexico, and are not flowed. Ask for Paul
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Replied on Fri, Apr 03, 2015 at 03:29 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Adam what kind of weight are you pulling? I run c-15's with single turbo's in my super trains and am getting that kind of mileage. Also what size gear do you have? I have an 07 t-800 big sleeper highway truck with 3;55 rears and a c-15 pulling a dump that averages 7.5-8 mpg. If you are running a tall gear in the rear end that could be your problem. If you are staying under 100,000 lbs you can go with a much smaller gear, that motor has more then enough power no matter how its set up. My trains all run 4;11 rears grossing 165,000 lbs doing city work. We do a lot of quad axle local dump work and have found that c-13's with 3:73 rears seem to work best averaging around 6 mpg with a fair amount of idle time. Also check your egt's because if you are running hot it tends to rob power from the engine thus killing mileage as well
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Replied on Mon, Apr 06, 2015 at 06:39 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Had an overhead done. Mileage improved 1.1mpg so far. I may try the diesel doctor as well to see if we can do any better. Thanks everybody!
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Replied on Mon, Apr 06, 2015 at 11:47 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I agree with Jeff. Good things to check. I am not going to bash the Diesel Doctor because I don't know him. I however would advise you to use people that are going to hook you up with proven mainstream power enhancements. I spend a lot of time fixing what a lot of people promote as programming enhancements. In full disclosure I have a connection to Arizona Diesel Solutions. We sell Bully Dog products. At the same time I cannot bash Pittsburg Performance or some others. I can only point out the diffence in the products and services of the stuff we sell vs some of the others. I own trucks with Bully Dog stuff and Pittsburg stuff along with parts that are mainstream CAT enhancements. Not everything needs to be out in public. You want our 2 cents please call. Our advice is worth what you pay. It is free. Ray however can give you the knowledge to ask the right questions, BEFORE you risk your equipment. My hearing and sociabilty are poor, so I always tell people to talk with Ray. He is a nice guy, I'm not. Shop number 623-826-1256
Art Pfluger |
Replied on Tue, Apr 07, 2015 at 09:34 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Run your overhead on your cat it could help.I have a 18 speed it helped me an get under your truck your fuel lines or old an wet they could be sacking air causing you lose fuel milage.
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Replied on Tue, Apr 07, 2015 at 09:40 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Run your overhead on your cat it could help.I have a 18 speed it helped me an get under your truck your fuel lines or old an wet they could be sacking air causing you lose fuel milage.
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Replied on Tue, Apr 07, 2015 at 09:41 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Run your overhead on your cat it could help.I have a 18 speed it helped me an get under your truck your fuel lines or old an wet they could be sacking air causing you lose fuel milage. [email protected]
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Replied on Mon, Apr 20, 2015 at 09:12 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Put a ball valve in the rubber hose that goes between the turbo's and turn it off. Your mileage will jump about 1 mpg. You wont' notice much of a difference.
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Replied on Sat, Apr 25, 2015 at 07:04 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
a mechanic told me that would either blow my turbo or my engine. They recommended I do not do that
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Replied on Sat, Apr 25, 2015 at 07:28 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
Which one will it do? Blow your engine or the turbo? I'm just curious. I did mine 9 months ago and all we do is mountain driving in Colorado and the only difference I've seen is I lost a little power, my engine runs cooler, and I get about 1mpg better fuel mileage. The single turbo kits are about $9000. I run about 2800 miles a week. So far no issues. I'll keep my fingers crossed and save the cash I've saved on fuel just in case!
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Replied on Sat, Apr 25, 2015 at 08:55 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I am just interested is the facts, that is why I talked with my peterbilt mechanic. Maybe he is wrong, but they think it would not be a good idea to block that hose off. I dont know for sure if he knows what it will cause. Obviously it is working for you. I am jusy sick of hearing of others getting 6+ mpg and I struggle to get 5.
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Replied on Sun, Apr 26, 2015 at 07:13 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
when you block waste gate hose the turbo over speeds shortning turbo life.depending on how much fuel is turned up will determine how much it shortens turbo life..usually since waste gate no longer opens the exhaust temp. goes up..if you're looking for more boost a larger turbo is normally the answer, but without more fuel bigger turbo doesn't always spool kwik enough so you get turbo lag..a good performance program is normally the best answer..
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Replied on Sun, Apr 26, 2015 at 11:03 PM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I agree with Ralph that a programmer is a better solution than blocking the waste gate hose. However if you have the proper gauges and know what you are looking at you could do the block off with very little problems. Most people don't have all the needed gauges and fewer now what they are looking at. This is why the Bully Dog product that Ray at Arizona Diesel Solutions sells is the best. They have mulitple screens with the info you need to make decisions. This would also stop the need for this barbaric blocking of the waste gate line.
Art Pfluger |
Replied on Mon, Apr 27, 2015 at 07:54 AM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
you want 10 to 15 lbs more boost than exhaust pressure ..the exhaust pressure is measured from exhaust manifold before turbo..this is normally checked at w.o.t. while on dyno or loaded on hard pull..
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Replied on Mon, Apr 27, 2015 at 10:39 AM CST
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Posted by a private BulkLoads.com member.
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Posted by a private BulkLoads.com member.
I understand where you are at because I was there two years ago. I would start with Fleet air filters or comparable air filters and a free flowing muffler. I went with a Pitts Power muffler, also what tires do you have? In my operation I gained mpg just by installing low rolling resistant tires. Lastly speed has a lot to do with mpg, how fast do you drive?
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