exhaust gas temp gauge pre or post turbo

[tomseeley]

I plan to install an exhaust gas temp gauge on my 2002 GMC Sierra 2500HD duramax/allison, since I routinely tow a 7,000# travel trailer, and I know how important it is not to coke the turbo when I shut down after long sessions on the highway.

 

My question is: should it be installed pre or post turbo?

 

The one truck store I've talked to so far had to call someone and ask how to install it, while I was standing there listening to him make the call! Talk about not instilling confidence in his level of expertise doing the work! Needless to say, I didn't hire him to do the job!

[SS Crew]

My buddy has the Edge with Juice in his D/A. He had to drill and tap into his exhaust manifold for a temp sensor. The Edge people say it more accurate at that location.

 

I'm sure different outfits will have different answers.

 

Try Gale Banks they are the diesel gurus.

[Shaners]

I've also heard that pre-turbo/manifold is the best place to put the sensor.

 

Another option would be... (and I don't recall who makes them), is a unit that has an auto shutdown based on H2O temp. You shut off the truck and lock the doors and walk away... it'll shut down on its' own based on what temp you want.

[Machine]

pre turbo provides the most accurate reading. That's the route I use when installing a pyrometer.

[silverado3500]

Pre turbo for sure!

[Black02Silverado]

All the die hard guys on the VW diesel forum run preturbo as well. Believe it or not some of those guys run auto cross in their vw diesels. If you going to drill you may as well drill where your going to get the most accurate information from.

[dewfpo]

Pre-Turbo, in the manifold is most accurate.

 

dewfpo

[silverado3500]

One thing to consider. . .When you're drilling, you want to be absolutely sure that you get ALL of the shavings out of the pipe. You don't want them to blow up into the turbo. A useful trick is when you have almost drilled completely through, put some grease on the end of the bit, and in the hole. . . The grease will help catch the shavings.

[GMC6000]

Just about all of the heavy duty diesels are all post turbo. I would not go pre turbo for the simple reason that if your pyro probe were to ever break, it is going to take out your turbo. The common misconception is that pre turbo is more accurate. There is a however a temperature drop between pre and post. Post temps are generally 200-300 degrees lower, but if you get the correct gauge, I installed Isspro R3607VWR (Recommended for AfterTurbo Install), then you will be just fine.

[Machine]

Just about all of the heavy duty diesels are all post turbo. I would not go pre turbo for the simple reason that if your pyro probe were to ever break, it is going to take out your turbo. The common misconception is that pre turbo is more accurate. There is a however a temperature drop between pre and post. Post temps are generally 200-300 degrees lower, but if you get the correct gauge, I installed Isspro R3607VWR (Recommended for AfterTurbo Install), then you will be just fine.

 

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Pre turbo is more accurate - It provides more "real-time" temp readings. Post turbo cooling of 200 to actually 400* is just an estimate of the difference of pre and post, and estimations are not as accurate as real time results. True, if the probe broke then you are SOL but the chances are very, very slim - so slim that the majority of turbocharged aircraft rely on temps from pre turbo probes, and the FAA has approved pre turbo probing on turbocharged aircraft.

[F117ewo]

Definitely pre-turbo. The best temperature. Don't exceed the melting point of aluminum (which your pistons are made from). Really....about 1250F is all the EGT the motor will take before damage will start to occur. Aluminum starts melting at 1220F. I try to keep it under 1000F all the time.

 

Jake

96 K2500 Suburban 6.5TD