EGT On The Duramax

[Johnny Cetane]

I'm used to everyone spouting 1250* is the maximum temp for the Cummins so what does everyone say about the Duramax? Do you stick with 1250* or does it like to run a bit hotter? Do you go off of what your pyro says or do add a couple hundred degrees to account for the air going through the CAC? (i.e. 1250* is max but you are OK with 1450* at the pyro because the CAC drops it 200*)

[Rttoys]

Most will say 1350-1380 max, others will say lower. Completely stock, mine will run 1320-80 pulling uphill around here.

New numbers soon to come...

[Johnny Cetane]

Originally Posted by Rttoys New numbers soon to come...

This should be interesting.


I've also heard that you have to be careful with rapid heating/cooling cycles on the Duramax because of the aluminum heads. If you spike your EGTs then let them drop rapidly you can blow a HG. Anyone know if there is truth to this?

[2500HeavyDuty]

Originally Posted by Rttoys Most will say 1350-1380 max, others will say lower. Completely stock, mine will run 1320-80 pulling uphill around here. New numbers soon to come...

There is no hills around "here"

I just got done towing The camper trailer out in the hilly part of texas, egts only got to about 1400 twice only cause i wanted to see the truck kill mosquitoes

With Stock intake 5 inch exhaust and my race EFI tune

[redneckbuckeye]

1400 is a number I have heard a lot

[Oilfield_Mafia]

I just pulled my 5ver from Poteau, OK to Erick, OK around 450 miles the way i went.. and the last 175 miles were into a very strong head wind .. (typical western Oklahoma) and my EGT's stayed right around 1300.. I was told 1250 about 2 weeks ago when i got these gauges, but I just cant see that being all I should run.. I mean even when I put the bully dog on stock tune it runs up to 1450 or 1500.. When I pulled the camper out here on this trip I was using the Tow tune on my bully dog.. Camper and truck together weighs about 300 pounds shy of 20,000. Im kinda thinkin about getting a 1 - ton next time for the lower gears..

[slowtowpig]

i spike at 1400, but thats a ford. i would think in general you wouldnt want to get over 1400, i cooked my last one at 1600.

[2500HeavyDuty]

i did one run on the free way with the boat hitting 1600+

Hey all dmaxes come with 3.73 stock

[Oilfield_Mafia]

what? are you sure? I thought You could order the 3500's with 4.10 gears?

[2500HeavyDuty]

you should be able to order it with 4.10

[Rttoys]

Originally Posted by Johnny Cetane I've also heard that you have to be careful with rapid heating/cooling cycles on the Duramax because of the aluminum heads. If you spike your EGTs then let them drop rapidly you can blow a HG. Anyone know if there is truth to this?

Don't worry about the heads or gaskets. The bolt pattern holds them just fine, it's mostly 'nay sayers' down'n the DMax and technology

[2500HeavyDuty]

i spike my egts alot, i see 1700+ alot

[rush]

I've pegged a 2000 deg. egt guage many times at the track.

[2500HeavyDuty]

mine only goes up to 1600, anything more than that i shouldn't be up there anyway.

[slowtowpig]

im sure you can get 4.10s in the big trucks, my tahow has 4.10s