Duramax Daily Driver Dyno results
12-12-2011, 08:20 PM
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Duramax Daily Driver Dyno results First my '09 GMC Duramax with lift and 35's
Picked up over 160rwhp and 140rwtq with still safe tune
So far I am averaging about 18mpg, up from about 12mpg
Next is my dad's '09 Dodge Cummins with lift and 35's
It picked up almost 60rwhp and 150rwtq with tuner on stage 1
So far fuel mileage is close to 20mpg, up from about 12mpg
Both were done at Relentless Diesel in Willis and we highly recommend them to anyone looking for more power and better fuel mileage
Picked up over 160rwhp and 140rwtq with still safe tune
So far I am averaging about 18mpg, up from about 12mpg
Next is my dad's '09 Dodge Cummins with lift and 35's
It picked up almost 60rwhp and 150rwtq with tuner on stage 1
So far fuel mileage is close to 20mpg, up from about 12mpg
Both were done at Relentless Diesel in Willis and we highly recommend them to anyone looking for more power and better fuel mileage
Last edited by Randy_S; 12-12-2011 at 08:44 PM.
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12-13-2011, 12:13 AM
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Gotta love diesels, couldn't afford a good one, but I am averaging around 19 mpg on the 4.8 silverado I picked up recently, it is nice compared to the 16ish I was getting with the camaro, and filling up with 87 vs 93 at that! 
Last edited by 78novacaine; 12-13-2011 at 12:22 AM.
12-13-2011, 02:06 AM
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Ive been thinking about getting my transmision built by them. Ive heard some good stuff hopefully sometime in the next couple months I will be taking it there, if the trans will last that long lol
12-13-2011, 09:48 AM
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I've debated picking up a diesel truck, but I've always wondered if the mpg tuning was true or not....I don't want a 12mpg daily driver, but 20mpg is damn near as good as I am getting with my Infiniti sedan and I'd much rather have a truck than a car.
12-13-2011, 10:18 AM
#14
I pulled off my tuner on my '06 Ram to get a warranty PCM reflash. Truck went from the normal 20 mpg, down to 17 mpg. I drove it around like that for about a month, then put the tuner back on. 20 mpg again. Diesels definitely can make more power and increase mpg at the same time. Get a pre-07 model, without the DPF crap they have nowadays. It will be cheaper to mod.
12-13-2011, 10:17 PM
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Relentless is very very good! Like Randy said, they did all of RC's work back in the day. I dynoed my truck there a couple weeks ago and it did 546/1042. Chris is a great guy and very helpful!
http://m.youtube.com/index?desktop_u...?v=TpSarrnNRWg
http://m.youtube.com/index?desktop_u...?v=TpSarrnNRWg
12-14-2011, 07:47 AM
#18
Technically, you are correct. A 6.7 Cummins will cost about $60 more to do the basic mods than a 5.9. A 6.7 will require an EGR blockoff plate ($60). The exhaust, CAIs and tuners are the same price for the 6.7 and 5.9.
If you go in for warranty work, the 6.7 is a little bit more of a pita to put back to stock. That DPF system is heavy! With that said, I did it by myself in my driveway in a couple of hours.
If you go in for warranty work, the 6.7 is a little bit more of a pita to put back to stock. That DPF system is heavy! With that said, I did it by myself in my driveway in a couple of hours.
12-14-2011, 07:55 AM
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I really want to mess with it but damn I just need to leave something alone. I plan on buying something new in a few years so I am not sure it would be wise on my part. I have had it 1 year and have a whole wooping 4500 miles on it.
12-14-2011, 11:30 AM
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The only dough I have Randy is the cookie dough my wife bought for all the holiday cookies she makes.
I really want to mess with it but damn I just need to leave something alone. I plan on buying something new in a few years so I am not sure it would be wise on my part. I have had it 1 year and have a whole wooping 4500 miles on it.
I really want to mess with it but damn I just need to leave something alone. I plan on buying something new in a few years so I am not sure it would be wise on my part. I have had it 1 year and have a whole wooping 4500 miles on it.