sleeperman

I'm going to be towing a toy hualer in a few weeks and I just brought it home at my egts are making me wonder. I have my smarty on 1 so I'm just running on the 125hp injectors and I just put dp back 5in on and my egts are running about 1050-1150 when going 65-70 and I have four sport atvs to go in it. So are my egts to high or am I just worried?

AggieJustin

Careful with the Smarty on 1 while towing. That is the mileage setting that runs very advanced timing. If I remember correctly, they don't recommend towing on that setting.

I'll generally run on 3 or 7 when towing, just depends on what I have and where I'm going.

hamilton71801

Is your egt probe pre or post turbo? The no-no temp is 1250 IIRC for post turbo and 950 pre turbo. I've read that a cummins can run all day at 1250 but that's maxing it out.


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DodgeRam24V

I'd say that is a little high on flat ground steady MPH.

I'll see that on mine going up Michigan's steepest grades towing a 44 foot trailer full of toys.

sleeperman

I'm probe is pre turbo should I just turn my smarty off or run on a different setting?

DodgeRam24V

oh, pre turbo. i have 2 pyros on my 99 now, it is hotter before the turbo by around 300 degrees. i just added the one in the manifold last Sunday for the Quadzilla and have been monitoring the difference.

you should be OK with them temps.

AggieJustin

You've got those swapped around. 1250 pre-turbo, 950 post. You can run higher than that without issue for short bursts, but you don't want to run higher than those temps sustained for long periods.

Your temps aren't bad when you account for the extra wind resistance. Adding the ATVs probably won't change the temps much since the weight is minor.

I would switch to #3 instead of #1 to back the timing off some. If you have the Revo software on the Smarty, you can always tweak the settings more if needed.

sleeperman

Well went and made the trip with no problems egts was still around the 1050-1150 and only got over 1300 once. I'm looking at a 64mn and watermeth to use the power that the truck can make.

95ram

A 64mm turbo might be a little big for what you have. IMO you're going to be best off with a 62/65/14. This turbo will support 525RWHP which from what I'm reading in your sig is less than you're putting out.

gnccrocks

you do NOT want to go over 1200 if you get to 1100 back of the pedle 1200 for more than 3sec starts to melts aluminum so you can watch your turbo blow out of your exaust

totalloser

+1 to Aggie. :P

Keep in mind that cylinder gas temps are WAY beyond aluminum melting temps. There are a handful of things that prevent melting at these temps. Thermal mass of the parts, and contact with cooling oil mostly.

The turbo has a shaft attached to the aluminum fans that is immersed in cooling oil, and the shaft is an additional thermal bank to keep the fans from melting temps. The pistons have cooling jets that are fed oil from the connecting rods.

95ram

Sorry, but that's some poor info right here. These things are designed by Cummins to run at 1200* all day long. Anyone who's modded a diesel knows that 1100* or 1200* isn't anything. Every one of mine has seen 1200+* and all 17 of them still run just fine. My DD sees 1200+ every day.

Mike Holmen

You'll do fine. I've run my 02 1200-1500 deg's a few times. The head will take a beating, probably crack the head seats/burn the valves out. Much higher than 1500 deg's you run the risk of melting pistons.

Newer trucks have more issues with egt's than the older iron. At 1100 deg's I wouldn't even watch the pyro.

Seen a few times a 1600 deg pyro pegged and would take 4-5 secs off the throttle to become functional again. Also seen a few engine blocks cracked from abuse.

j-fox

Don't assume the pyro is accurate, it may be off some!

I know a guy who ran his 30 miles with temps at 1300 to 1600 egt's.
He melted two pistons, dropped valves and scored the cylinder walls.
He was told 1300-1400 would never hurt it.
Want to do that?
Of course not.
Respect it and it will run a long time.

Question is what rpm is it running at those temps?
Can you simply downshift to get you thru it.

Mike Holmen

There is more to the story than just watching the pyro but thats what everyone talks about. Seen a few VP engines melted down, most from piston cooling nozzle issues. Even few with cracks in the oil supplying the cooling nozzles.

Newer engine with tight piston to cylinder wall clearance/tight ring end gaps wouldn't like any big egt's.

I ran my truck a few times hauling a trailer from Vancouver to Calgary (600-700 miles), pulling thru the mountains with the pyro not less than 1200 deg's. I'm still on the original engine, just on my third cylinder head. Seen my exhaust manifold red a few times, really really hard on turbochargers