Angry Johnny

My boys gave me some Max Tow dual read out boost and pyro gauges for Christmas, I have some great kids, so I was wondering is it better to mount the probe pre or post turbo and what sort of temperatures should I be seeing out of either location?

Thanks.

Hillbilly66

I have mine mounted pre turbo, just daily driving it stays around 700-800 unless I get on it. When I tow it's at least a 15k pound trailer and I'm usually around 1150-1200.

I'm sure some one will correct me if I'm wrong, but I believe the reading would be about 100* less if mounted after the turbo.

BILTIT

Pre-turbo for sure. Cummins rates these engines at 1250F all day long (100% duty cycle), anything over 1250 and you need to reduce the time spent there.

cougar

This was written for 94-98 Dodges, but the idea is still exactly the same for 1st gens.
Ram/Cummins EGT and Pyrometer installation

bobva

It depends on what they bought for you.
They make pyros for both locations. pre OR post

oliver foster

I install my pyros pre turbo, as they get a more precise temp. reading.
I drill them in the back 3 cylinders exhaust port half as well as the rear cylinders run hotter.

cougar

My 91 had both pre and post. I had a selector switch next to the gauge.

redneck1057

Thats really neat! what was the difference in the temps of the two locations?

thrashingcows

I bought an Isspro post turbo gauge and poyro system....it works fine. I just add about 150* to the reading I'm seeing to get a ball park for what's at the manifold.

Angry Johnny

The gauge they got me can go either pre or post. The difference being a post install would be a lot easier. I'm thinking that since I don't work my truck hard that location may be just fine even if it isn't the most accurate.

Thanks guys.

1972RedNeck

cougar

The most I ever saw was 200°. That was under extreme conditions, heavy load up a steep hill WOT with 35psi boost.

Redtruck-VA

Just installed the pyro sensor while I had the manifold off to change gaskets.

Mopar_Aaron

I believe the highest temp you would want to see with the probe mounted pre turbo is 1200° and post around 900° a lot of guys like to mount the probe in the downpipe to give themselves reassurance (just in case the probe was to break and screw up the turbo) but a lot ppl also mount in the exhaust manifold because it allows you to "know" what's going on with your Cummins before something disastrous can happen. Either way both methods are effective. If you mount in the exhaust manifold you should put the probe towards the back of the manifold (the "neck area where the turbo meets the manifold actually has a split in the middle that divides the area in half.) Mount the probe in the "back" half or if you were standing on the passenger side leaning on the fender facing the engine bay mount probe towards the left or the manifold neck area.