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Discussion Starter #1
I am 'old-new" - used to be a "regular" in here when I bought my 2005 "dualie" crew cab 3500. I am back - selling the 2005; bought a "mint" 2013. As much as I liked what my 2005 can do, have to admit, this 213 is something else in many ways, power, silence, etc.


O.K....question time. I have delicate sensitive ears - I really don't like the sound of connecting rods coming thru the sides of engine blocks. I would like to avoid that.....! On my 2005, there was a "RED LINE" on the tach. My 2013 has NO "red-line".


Of course I am aware in "tow-mode" the up-shifts come at higher engine speeds. More than once my 2005's engine approached the red-line while heavy towing. I tried to keep engine rpms below 2,000.


Of course with the additional top gear, my 2015 never sees 2,000 rpm at highway speeds - but what do you guys think is a safe cruising and top engine RPM for the 2011 & later Duramax ?
 

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When you see those flashing red lights behind you, look at your tach and mark that as your max RPM!!
 

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The Allison trans is strong and works incredibly well with the Duramax.

I'm a bit like you and don't like to see an engine getting anywhere near the redline.....which becomes a bit difficult when you don't know what the redline is!!

I recall reading somewhere that 3200 is a "line in the sand" for a redline.

I rarely (if ever) have seen my tacho get that high. I try to drive so the revs don't get much above 2500rpm and like to see them below 2000 as much as possible.

It depends a bit on whether you're towing too. If towing a decent size trailer you really do need to use TH mode and be satisfied that it is better for your engine to rev a bit higher.....it actually keeps the EGTs lower.

Roachie
Kadina, SA
Australia
 

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Bac To The Future
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Dont worry about it. You arent going to do anything to hurt your engine, even with the turbo braking help. IIRC, on stock tuning fuel will start to pull back around 3600rpm.
 

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You might have delicate ears, but these aren’t delicate engines. If you’re going to putz around like a grandma trying to find her hearing aid on the floorboard while she’s driving, get a Prius, at least people expect that type of driving from a Prius owner.

Don’t worry about it, put the hammer down and drive the stupid thing. It’s a stinking truck made to pull and haul. Every time I drive my truck I redline it many times, towing or not. I floor the truck when towing 23,000 pounds. I beat the piss out of them like they were built for, and they never miss a beat. Runs great, tranny fluid is red and smells great and the tuck tells me it likes it. I’ve driven every Duramax that I’ve owned this way and they have all ran great until I traded them in. BTW, I’ve seen right around 5,000 RPMs on my tach before, what a beautiful sound that was to my delicate ears.
 

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Discussion Starter #7
You might have delicate ears, but these aren’t delicate engines. If you’re going to putz around like a grandma trying to find her hearing aid on the floorboard while she’s driving, get a Prius, at least people expect that type of driving from a Prius owner.

Don’t worry about it, put the hammer down and drive the stupid thing.
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Reduced to its bare essentials, Mr. Banks's above post did answer my question. So - thank you for that, Mr. Banks. Assuming you are correct, the higher rpm's when pulling grades in "tow" mode aren't going to damage my motor.


I do take exception to your insulting remark about us old people. Yes, I am 78 - I worked my way thru college as a truck mechanic, so I do have a background in what is involved when you over-rev. a relatively longer-stroke motor typical of diesel design. Yes, my knowledge is a bit dated; I suspect I was "rowing Brownies" ( explanation for you young folks...Browne & Lippe was ONE of many manufacturers of auxiliary transmissions for "over-the-road" heavy trucks. Soehow, the name stuck; so those of us who actually "been there" know what a "Brownie Box" is...!


In any event, I discovered something that Banks may not have discovered yet - comes with age. PAIN HURTS. Aggressive driving can be a bad thing. Can bring about PAIN.


Don't make the mistake of assuming I am not "dangerous" just because I am 78. Ask any cute girl who has had the misfortune to be alone with me....for that matter...same goes for goats...sheep...chickens...."any port in a storm"....


As a side-note, Banks makes a good point about the color of automatic transmission fluid. If it is getting dark..is no longer a clear RED....change it and the filter IMMEDIATELY and hope it isn't a sign of big problems.!
 

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No, your motor will not be damaged, these trucks are incredibly smart and will not allow themselves to be damaged.

My apologies for what was perceived as an insult, I could have just as easily said driving like a teen trying to post to Facebook while scanning the radio looking for the latest 15-seconds of fame pop hit. It’s not about the age, it’s about the act of driving and the importance given to it that I was referring to. When people drive as though nobody else has anywhere to be, usually at 5-10 MPH under the speed limit, that is irritating. I just ask for concentrated driving and at least at the speed limit.

Not sure if the pain you are referring to is to the truck, to your own body, or to others. Myself, I find that spirited (or what you are probably referring to as “aggressive”) driving is safer driving. The reasons are obvious, but when you are actually engaged in your driving you are paying attention, eyes are wider, pulse is up, you’re enjoying the drive, you’re expecting things to happen and you’re prepared for it. I enjoy driving and pushing my vehicles a bit, sometimes a lot, but I would never do it in a way that would bring pain to myself or anyone else.

I’m going to leave that fourth statement alone lol.
 

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Rumor has it that with the early duramax tach dealers were getting complaints because the grade brake would let the engine rev into the dashed redline area and people who hadn't looked at the manual didn't know this was normal and the solid red was the redline.

So...... GM just got rid of the redline. With the engine management there is no way to get the engine to exceed the redline anyway (at least without a programmer) so it is a moot point and it solved the problem.

On steep downgraded with my 2015.5 (and my 2004.5) I regularly see 4500rpm or so with the exhaust brake on or grade brake enabled.
 

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Discussion Starter #10
……... With the engine management there is no way to get the engine to exceed the redline anyway.......
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Thanks to all of you - the above is EXACTLY what I wanted to know.


O.K...you guys have assured my "new" Duramax wont "over-rev"/ come apart given the way modern computers run things. (no - I don't have any "mods"...computer or otherwise.)

With my 2005 (again, dualie crew cab pulling 11,000 lbs + ) I found the best compromise on long trips for fuel mileage was about 62 mph, with the 3.73 rear end in 5th that worked out to be around 1,900 rpm. With a 11,000 + load, I WAS getting around 9.8 mpg.


Obviously, with the extra gear (that came in with the 2011 models) my 2013 hits that rpm at around 70. What kind of fuel economy and at what speed do you guys expect with the 2011 and later Duramax when towing heavy loads ?
 

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My 2016 gets about 12-12.5 dragging my 11K travel trailer at 70 on a long trip. like all engines, the more aggressive you drive, the less fuel mileage you will get. My wife always freaks out when I pass someone going 70 and run it up to 85+ to get around them quickly/safely! LOL!
 

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Discussion Starter #12
My 2016 gets about 12-12.5 dragging my 11K travel trailer at 70 on a long trip...!

Thanks for the info - I am looking forward to the higher crusing speed & better diesel milage that extra gear will give me.:cool2:
 

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Trailer tires

My 2016 gets about 12-12.5 dragging my 11K travel trailer at 70 on a long trip. like all engines, the more aggressive you drive, the less fuel mileage you will get. My wife always freaks out when I pass someone going 70 and run it up to 85+ to get around them quickly/safely! LOL!
I hope you don't have ST tires on your trailer, they are only rated to 65 MPH, either way if they are Chinese, your life is in their tires...
 
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