I'm a little conservative and have my CTS2 EGT alert set at 1350.
I would rather be a little safe than :cookoo[1]:
I figure by the time the alert gets to the thinking part of my brain, it will be @ 1375-1400.
1400 is probably ok, but for a very short time.

You could do a search by clicking on the magnifying glass on the top right of the forum page, type in your ? and find all kind of responses.
Including a few claiming 1500-1600 all day long, I wouldn't suggest that.

 

These trucks are meant to run and sustain 1250 degrees all day without a problem. They can see higher spikes in temperature but only for a short period of time. It's best to stay below 1200 though.

 

Mine have seen well over 1800 a lot. Not saying it's smart or good for it but they are still alive. I did melt the valves in my LLY once but the hg's were fucked.

 

That is a moving answer, you can reach certain EGTs, but shouldn't maintain them. The max EGT varies by time sustained. Sorry, I don't recall specific numbers though.

 

1350 used to be the constant everyone said was max safe egt for the duramax for long periods, probly has changed.

 

I have hit 1600 on my max effort doing quarter mile runs but that is about the only time it's ever over 1000 even lol

 

Anything over 14 or 1500 or an extended period of time can cause issues. Not a big deal for a few second sled pulling or 1/4 mile but I wouldn't hold it there for more than a few. Towing is a different story..

 

If you're seeing 1400+ for a sustained amount of time you're gonna see the coolant temp start to get hot. Pulling a trailer I've seen them that high after noticing my coolant temp start to rise so who know how long it was there.


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Not to mention the truck starts running like do shit from the heat and the clutch fan.

 

Did you swap out yours for an electric?


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I pull throttle at 1350 even though it's said you can sustain that for I think 5 minutes?

Towing in hills I try to keep it at or below 1250, maybe up to 1300 if I'm almost over the hill.


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Well I don't sustain any high temps ever just a little over 1400 for say a min tops but probably not even that long.

 

The LMM's run 1350 sustained during a regen which can take a half hour or more. I'd say that is a safe max temp, probably good for 14-1500 for short blasts though.

 

I wouldn't suggest making it a habit of 1400-1500 even for short blasts.
Unless you don't care if the engines life span is shorten as well.

 

There's been alot of links where high egts caused cracked pistons.. I wouldn't be afraid of 1350 sustained but 1400+ foe more than a half minute and I'd be getting worried..

Keep in mind the duramax gas oil jets that squirting oil onto the bottom of the pistons. Sustained high egts will heat soak the engine oil. The engine oil also gets cooled through the radiator as well, heat soaking the coolant. Of I were towing and coolant temp hit 230+ a few times I'd change oil asap. Heat kills oil; oil is the only thing keeping these engines alive

 

There's been alot of links where high egts caused cracked pistons.. I wouldn't be afraid of 1350 sustained but 1400+ foe more than a half minute and I'd be getting worried..



Keep in mind the duramax gas oil jets that squirting oil onto the bottom of the pistons. Sustained high egts will heat soak the engine oil. The engine oil also gets cooled through the radiator as well, heat soaking the coolant. Of I were towing and coolant temp hit 230+ a few times I'd change oil asap. Heat kills oil; oil is the only thing keeping these engines alive

If you get used to what oil pressure you should see at what rpm you have a good idea of oil temps. Pulling hard hills or into into wind gets the oil hot!


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Wawaa my alarm is set at 1370. I'll usually start backing off around 1350 sustained for over 1 min. 219k on my '15

 

My Edge CS alerts me at 1330. That's my feel safe limit.

 

I know a guy that's on a stock turbo lly, 150% over sticks, and a 12mm stroker cp3. Hes buried his 2000* Pyro pulling for the last 2 years and somehow it's still together:cookoo[1]:
He's tearing it down after this year and building it so we will find out how it looks inside. All 8 pistons are probably melted at this point lol. If your only holding it for a few seconds it's not really giving the Pistons or engine a chance to "bask>" in that heat. Now I'm not saying this a good idea or your truck in particular won't melt it down. Don't try this at home
I mean, wvr rig rat had flames shooting out his exhaust and it was fine:rofl

 

I don't have an egr probe and I know I need to get one. But last time I hauled 2 rangers to Colorado my engine temp reached 220-225 ish. Readin this thread made me think bout that trip and wonder what my egt's where at that time climbin the mountains.

 

Just wonderin if y'all could guess what my egt's where roughly on that trip.

 

just wonderin if y'all could guess what my egt's where roughly on that trip.

go to the tuners website and read the disclaimer and the minimum recommendations for tuning, an egt probe...
　
　

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i was toying with the truck the other day and put her on the race tune and laid right into it for a good half mile maybe going up a small upgrade. By no means was it really steep at all, i saw my readings go over 1400 so i let the foot off the throttle. I have a 3" dp and a straight 5" exhaust. Just looking to see what the magic number is to stay away from. I'm sure it has been discussed but i am gonna ask it again. Thanks everyone for the info.

doing that after driving conservatively for awhile is a good way to limp your transmission, a couple successively harder accelerations is best. Egt's, depends on how heat soaked the engine is, how many times, how long the high egt's have been sustained before you do engine damage.....
　
　

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Hard to say, but when I have a clean cooling stack I don't build coolant heat unless I'm over 1250 for atleast a minute or two.


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Hard to say, but when I have a clean cooling I don't build coolant head unless I'm over 1250 hfor atleast a minute or two.


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What does "clean cooling and build coolant head" suppose to mean?

Just wonderin if y'all could guess what my egt's where roughly on that trip.

#1 your not mentioning what hp tune level your running, what rpms you was running and what gear your trans was in.
#2 most people running tunes will install a EGT gauge, it's even suggested by tuners to install a EGT gauge when tuned.
More so when towing that's when EGT's can spike real high real fast.
#3 It would just be a guessing game on what your EGT's was.
Besides my crystal ball is in the shop for repairs.

My suggestion would be to install a EGT gauge when tuned especially if your towing "anything".

 

Yea I know it'd b pretty hard to guess at it. All I need is a probe. I still got my edge evo monitor I'm usin for guages. Btw where did u getta crystal ball? That's gotta b handy

 

Sorry *cooling stack *heat


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