always before the turbo. The point of a pyro is to know whether or not you are about melt the pistons or not. The purpose of a turbo is to convert heat energy in the exhaust gas into compression forces on the compressor side. It sucks heat out of the exhaust gas. Knowing the temperature downstream from the turbo won't tell you whether or not your pistons are in danger.
Try the forward side of the manifold, just off center. DO NOT drill in the middle. I'll get some pics of mine up here......If I can figure the puter thing out.:doah:
Diesel Manor http://www.dieselmanor.com/default.asp has the full instructions online with pictures. I attached a picture of where I put mine. The white cross is where I drilled. This is a 6.7L but the location is the same for a 5.9.
Forward or after the turbo is acceptable but you will read 150 to 250 degrees lower for hotrodders with chips I would agree pre turbo but for a stock work truck or tower after turbo. All class 8 trucks come from the factory with the pyro post turbo whether it is Cummins, Cat, Detroit or Mercedes. JMHO Jim O
if you are willing to take an inaccurate reading, why bother with the gauge. A stock truck isn't going to melt pistons so save yourself the trouble and the cash. If you need/want to know what's happening inside the motor, put it where it belongs.
If it is so inaccurate why do the big boys that I mentioned in my previous post place the probe post turbo. Why do Jacobs (a division of Cummins)put a 1/8th npt hole in the exhaust brake to put a thermocouple in to measure exhaust temp after the turbo. I agree with you that if my engine was chipped I would go pre turbo but do not ever think that a stock engine can not make high ex temps I can make 1100 post turbo and I have only a BHAF and the toner mod to my engine. With a chip the heat comes a lot quicker. Jim O
Sorry for not getting my pics here...I forget. :doah: I can't get the site to send the 're-ply posts' to my e-mail addy. I drilled a port on the very top, where 3,4,2 & 6 dump. I can hit 1400+ on OEM software! ......without a trailer. It is hard to believe that there is NO turbo cool-down feature on these trucks.
I went post turbo in the Exhaust brake (since there is already a pre drilled hole) and set my defueling for 1000*. Seems to work well for me, as I have not pulled over 950 yet, I am sure it will with my toyhauler, but even loaded, with the 6 speed, it sits around 500-600 on flats and moves up to 900 or so when pulling hard. Maybe I don't run as hard as you all, but I do keep my XZillaraider at 30HP when pulling the toy hauler. Scotty
For the newer common rail guys, what is safe temp to read after the turbo. I have the Pac Brake and it has a hole pre drilled so ill just use that....Just not sure what the difference in temp is.
i thought i was crazy, my truck hits 1400-1450 all the time pulling my gn on any grade...with or without my quadzilla tow module, and running straight exhaust...people told me impossible i would have melted my engine long ago...real confused its allways ran that hot and have 82000 miles...the dealer by my house said it was o.k. to run that hot, that he newer trucks just run hot...well anyways have you had any issues with the engine runnibg that hot??
What is the limit? I just installed the juice with attitude on my 06,it was pre programmed to defuel at 1350.I can hit 1350 in level three driving a little harder than normal.I had an f-250 with the same and u had to really hammer down on it on level 5 to reach 1350.Both had 4" exaust turbo back and cold air intakes.Both pyro's were pre turbo.
My pyro is post turbo, where Cummins (Cummins certified tech, 25 yrs experience) told me to place it. And thats with or without performance upgrades. I was also told that the motor could handle 1450 degree egt temps all day. So 1100 degrees is the temp that I start to get concerned. Being I figure a 300 degree temp diff being post turbo. First pull with my truck (stock), egt's would climb very fast and take a long time to cool off. Problem was the stock muffler was partially clogged. Had I not had the guage, not sure how long the motor would have lasted. Bottom line, its your truck. Take in all the info and make a decision you can live with.
