So I'm currently pulling heavy, total weight is around 22-24,000, with my dump trailer loaded, and I'm just curious what type of exhaust temp I should be seeing. In what I call fifth gear but what Ford calls forth gear, the gear right before overdrive, I am currently going 55 at about 2,200 RPM and if I just keep enough throttle to cruise at that speed my exhaust is around 800 to 900. But while I'm accelerating up to that speed and if I give it some pedal to accelerate it very gets up to 1,250°. I have not seen it get to 1300, but it has come close when I'm accelerating up to 55. I do still have an exhaust manifold leak and potentially some other leaks that I don't know about. I have a 4-in PVC cap at the house and I have a thread in Schrader valve to drill and tap the hole for, now I can test for boost leaks.

when the exhaust starts getting up towards 1200 I'm around 20 PSI boost because I'm accelerating. Of course I'm not stomping the pedal I'm just accelerating, and I am in a 65 HP performance tune.

Anyway, while I'm accelerating my exhaust seems to climb to up to and sometimes over 1100 degrees quite quickly, is this normal? Remember I am pulling around 15,000 lb right now. With the weight of the truck I'm around 22-24,000 lb.

Speaking of weight numbers, I weighed my truck with my gooseneck dump trailer the other day. With no load in the trailer, to see how much it weighed and, with a half a tank of fuel, an empty trailer, and just me and the truck my weight came up to 12,500 lbs. So yes, I do have quite a bit of weight in the trailer right now. Hauling like three and a half or four yards of subsoil topsoil mix. It's pretty heavy.

Anywho, let me know what y'all think about the exhaust temp, thanks!

 

You can run 1250 all day long and be considered fine. Short spurts over that temp is also fine. Just not sustained. Sounds about normal to me.

 

Sounds fine to me. 1200-1250 is safe for these things. I wouldn’t let it hotter than that. Some folks will argue that 1300 to 1350 won’t hurt it, but I try to stay on the safe side of things, usually 😁. Granted you are towing heavy so that makes it work harder so temps may climb quickly.

 

Remind me what injectors and turbo you are running. PHP65 performance can be a hot tune for that total weight if the go-pedal is on the floor for a sustained period, but it seems your turbo is keeping up. My MST does not keep up towing heavy with this tune, but works well enough for accelerating, then 1/2-3/4 pedal cruise. Agree with these folks, your EGT is doing well.

Interested to see if you find any leaks that rob potential boost.

 

Well I for sure have an exhaust manifold leak. I found it a while back and I just have not bought gaskets for it yet.

I'm running new stock injectors from Bitterroot Diesel with a kc300x stage 1 drop-in turbo. I can get the turbo up to about 32 psi of boost but I have to stay on the pedal for a long time. I know I for sure need manifold gaskets and, my lower CAC boots are not looking too hot. But other than that I shouldn't have any leaks cuz I tested for him a while back but that was before the bigger turbo and the new injectors so, we shall see!

 

Awesome, thanks!

 

Thanks for the advice! Happy everyone says I'm in the green. Nothing to worry about!

 

A buddy of mine had a 12 valve Cummins with big injectors and compound turbos. It would push 70+ PSI of boost and the EGT gauge would climb and peg at 1500 rather quickly. We knew better than to stay in it very long, but I'm sure that thing hit 1600-1700-1800 a couple times.

My buddy sold it, and the guy that bought it wasn't so smart. It melted down shortly after. Real shame. Was a cool setup.


Moral of the story, <1300 pre-turbo is fine

 

One of the things I did to my X was to install an ISSPro boost gauge with a red light alarm set at 1250*. If I see the light out of the corner of my eye I can back off almost imperceptibly and turn the light off.

Mark