sallyman1

I know theres lotsa info on this but id like a mini poll or something on who put theres before and who put theres after the turbo. putting it by #3 would only give u reading of first 3 cylinders and not back 3. putting it after turbo would give you a mixture of all 6 cylinders minus a bit of loss? how much?

AggieJustin

Actually, the loss is more significant than you'd think. Plus, post-turbo gauges are slower to respond than pre-turbo.

Generally accepted thinking is to put it on the back three cylinders (normally the hottest) to monitor those temps. Granted you won't see if one of the front three spikes in temp, but the only way to get that level of monitoring is to run multiple probes.

Pooter

Put it in the "collector" portion of the manifold, measuring the back cylinders, the manifold is actually split in two at the bottom, just make sure you are drilling the center of the opening for the rear cylinders.

Heres a shot of mine, Edge pyro up top, and guage pyro below...(id do the lower one to measure the hottest temps youre going to see)

Megaramasaur

Mine are the same as Stacked97's.... My commander is on bottom, analog guage between 3-4. The 3-4 placement is 50 degrees hotter than the collector area by the flange

sallyman1

thats what i mean. its not like my truck will run too hot anyways with my setup. what about the piece right AFTER the turbo? could it be tapped easily? how thick is the manifold?

Kman9090

Go pre turbo, all I had was the edge juice and blew a motor up. Also I was gonna put my strait across from the other one. Is it really better to have your second one where yours is at stacked97?? Does a analog gauge read hotter then the digital monitors?

EDR

I put mine after the turbo in the elbow. It's plenty thick and I had no problem tapping the hole.

I removed the elbow to tap it on the bench, but getting the elbow back in was a bit of a task. It has a very small pin that needs to be aligned with the turbo, and trying to align it and hold it in place while installing the clamps was a bit of a pain.

I haven't towed anything heavy yet, but I have seen my EGTs climb up over a grand while towing a small trailer with dirt bikes up a small grade. The truck didn't feel like it was lugging, but the engine was heating up.

Many of the members claim a drop of 200*-400* post turbo, so I have my Commander alarm set at 900* - just to be safe.

kyachovitz

This is where I put mine. I was worried about drilling the manifold, but it wasn't bad at all. Good taps and bits help.

na4now

I put mine in the same place. I used a magnet and got 99.999 percent of the filings out.

On mine, this go round, I used my 18v drill for the whole process. This way you can hold the exact same angle. all the time. And, boy did it go fast! Done in less than 10 min.

Lost Lake

Pre-turbo. That's where the heat is. Heat is what you want to measure.

If you don't care to measure the heat where the heat is, place the probe in your muffler, your glove box or in the fuel tank.


Kinda cocky huh??

Really, you want to measure pre-turbo. Just like we do in airplanes where the difference is life and death, and the engines cost a LOT more than a Cummins...

AggieJustin

While 200*-400* may be a good average to keep in mind, the issue is that by the time you see high readings at the post-turbo pyro, you're probably well into the danger zone at the cylinder.

At idle, pre and post temps are close. But when you drop the hammer and your cylinder temps peak, you lose heat through the exhaust manifold and turbine housing before you reach post-turbo probe. The longer your cylinder temps stay high, the higher your pyro probe reading will get. Then when you back off, it will take much longer for the post-turbo probe reading to drop since the heat has to dissipate from the manifold and turbine. That's why the post-turbo probes are good for reading safe shutdown temps, but they're a compromise when watching for high temps when running hard.

matego

I run one in the top of the manifold for 4-6 readings, thats the one I watch when hammering it. I also have one post in the cast elbow for cool-down and to make sure 1-3 are playing nicely. I would say a good average loss is 250 deg. and I dont think the difference in time they go up are horribly different.

Pyro probes are not all the same either. I thought I had a bad one when I had a wire rub on the firewall. That probe is 50-75 deg. lower than the one I replaced. So.... which one is accurate?

Ghost Ram

i have had both. i had one in the elbow post turbo and now i have one in the manifold cyl.1-3 pre turbo. the difference is 350 deg on my truck. i would recommend going pre turbo because you want to know how hot the temps are coming out of your cylinders before your pistons start to melt. i do wish i would have installed mine in the rear section of the manifold as cyl. 6 runs the hottest, but i didnt have a right angle drill. i will probably install another one later when i remove the manifold to monitor cyl 4-6.

IMPORTANT: alot of guys will tell you not to worry about droping the turbo when drilling pre turbo . i went through the little bit of extra trouble to drop the turbo and placed a piece of cardboard coated w/ grease inbetween the manifold and turbo before drilling. well, im glad i did because even though the drill bit spit out alot of shavings, all kinds of metal shavings and metal dust stayed in the manifold and stuck to that cardboard. then i blew through the hole w/ compressed air and even more came out. im sure glad i dropped the turbo otherwise all that metal would have went straight into it. also some guys will tell you to drill w/ the engine running, thats another . not only is it dangerous and stressful, but if your bit breaks off while drilling its by by turbo. not to mention theres no guarantee that any shavings still wont go through the turbo. their not all going to blow out when theres a drill bit cloging up the hole

goodluck w/ your install and dont be afraid of dropping that turbo to install in the manifold. once you break the bolts loose its gravy.

Pooter

Its not that there is a difference between the type of guages, just more from the location, the back two cylinders run hotter than the front 4.
My analog guage reads about 50-75* hotter under WOT, but averages out pretty close when cruising/idle.

The only reason I did mine like that was just to measure both ends of the spectrum.


Post turbo is pretty much useless IMO, you arent actually seeing the heat that the turbo is, youre seeing it a good 2-300* cooler(and sometimes more), which sure, that makes you feel better, but it wont when you roast your turbo(or engine)

2rowdy

Pre-turbo here.