New Pyro after turbo, what kind of temps hauling hay

[JCasper]

Friday after work I will be installing my new Westach Combo gauge and I am installing it after the turbo. Saturday morning I am heading over to Central oregon to get a load of hay. I will probably have somewhere between 18,000 and 21,000 lbs gross on the way home, what kind of temps should I watch for. My truck is stock and I am thinking I should just keep it under about 950. Does that sound like a safe temperature?



Thanks,



Joe

 

[BTighe]

i would say 900* max if your towing and holding the temps there. may i ask why your not installing it in the manifold. faster and more accurate reading. i with a stock truck they say they can handle whatever temps it sees.

 

[Msilbernagel]

Joe,



Mine's basically stock (04. 5), even though it's transplanted into a Suburban. It has the 6-speed, and 4. 10 rear-end ratio. I went up and over White Pass this past weekend, which has some 6% grades on the 15 mile stretch between Packwood and the summit. Did have to shift to 5th, due to the curves keeping me in the 50-55MPH range. That put RPMs between 2200 and 2400... my post-turbo temp never exceeded 900, usually less. Keeping it under 950 post-turbo sounds wise, though if you are stock it shouldn't be easy to hurt things without trying just a little to do so.



I don't know what effect the taller tires might have - I'd consider max-boost runs in 6th to be the most likely candidate for creating problems (trans-temp / transmission bearings) for you. Perhaps others can comment on that. .



The trailer I was pulling is a 25' Wildwood - probably a bit lighter than the 18k combined you're thinking of - but at least you have one point of reference.



Let us know how it turns out.



Regards,



Mark

-

Friday after work I will be installing my new Westach Combo gauge and I am installing it after the turbo. Saturday morning I am heading over to Central oregon to get a load of hay. I will probably have somewhere between 18,000 and 21,000 lbs gross on the way home, what kind of temps should I watch for. My truck is stock and I am thinking I should just keep it under about 950. Does that sound like a safe temperature?



Thanks,



Joe

 

[JCasper]

i would say 900* max if your towing and holding the temps there. may i ask why your not installing it in the manifold. faster and more accurate reading. i with a stock truck they say they can handle whatever temps it sees.

I have read a lot of debate about where to install they probe. After the turbo you don't have to worry about chips getting into the turbo during installation, cummins says to install it after the turbo, and my truck is going to stay mostly stock so I would like to be able to use it to make sure my turbo is cool on shutdown. If I do any mods I am thinking of an exhaust, and maybe an Edge with Attitude controller. If I put the Edge on I will then install that Pyro in the manifold and have both gauges.



I know everyone has their own reason behind where they mounted their probe and up until a week or so ago I was going to mount it Pre-turbo. But after reading alot about stock trucks and towing, it seemed to be a good idea to mount it after the turbo to be sure the turbo has cooled sufficiently before shutdown.



Next year I am planning on buying a fifth wheel or travel trailer and right now I am just trying to get prepared.



Joe

 

[K5IP]

I see a max of about 900 deg on my 95 which has only slight performance enhancements (#10plate 3kgsk). This occurs mostly at high elevations, (10,000ft), post turbo. I also like the post turbo arrangement so I can watch the turbo temp drop prior to shutdown. I agree though that if I was worried about exceeding normal operating conditions, I might have chosen a pre turbo configuration.

Rog

 

[JCasper]

So on Saturday I got my Westach gauge installed and Sunday I went to Central oregon to pick up a load of hay. The gauge worked great, I installed it post turbo in the elbow and I took the elbow off to drill and tap the hole. On the way over with an empty trailer I could hit 950 degrees pretty easy running in sixth gear around 70MPH up the grades. I did see it at almost 1000 for a short time, I think I was pushing 75 or so up the steepest part of the pass going by a powerstroke with a two horse trailer behind him. On the way home I had a little over 20,000 lbs GVW and coming up the long grade by Suttle lake on Santiam pass I was able to run 55 MPH in 5th gear, 30lbs boost and only 850 EGT. The thing that worried me on that pass was the motor temperature, it was running around 215 or so. The air temperature outside was 100 degrees.



About half way up that hill the boost hose on the back of my gauge popped off and scared the you know what out of me. Here I am looking at my gauges very closely and here this loud pop and my boost drops to zero. I am thinking intercooler or something along those lines and I am on a hill with 5 tons of hay behind me. I pulled over and after checking under the hood, decided to check the gauge and found my problem and got it fixed and was back on my way.



Anyways the trip over went well and was very happy with how the truck performed, I am planning on getting one more load this weekend.

 

[WestTN]

To really know exactly what your EGT is, you will need a copy of the turbocharger efficiency map and do some quick calculations on current boost pressure and current after temp to arrive at a close approximation of the preturbo temperature, which is what you really need. That is the environment your valves and pistons are in and they are what you are trying to protect.



Drill the manifold and put the thermocouple pre turbo. you can avoid getting chips in the manifold by losoening the turbo and slipping a piece of about anything between the mounting studs to route the chips out of the manifold. Even if you do get a chip or two in the manifold it will not hurt anything. at startup, ther turbo isn't turning, so the chips just blow through without harm. Now you can depend on the readings to be accurate and applicable to your situation. No more guessing.