Pre or Post Pyrometer Install
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Freshman User
Joined: Nov 2003
Posts: 33
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From: Kansas
Pre or Post Pyrometer Install
I am getting geared up to finally purchase the three guage set that I have been wanting for quite some time.
I have a question: which pyrometer to buy, a pre or post turbo installation.
I am not sure where to look to see if my tube is already tapped??
I am nervous about doing any drilling or serious mods to install these guages.
I would appreciate your opinions on my best options.
I have a question: which pyrometer to buy, a pre or post turbo installation.
I am not sure where to look to see if my tube is already tapped??
I am nervous about doing any drilling or serious mods to install these guages.
I would appreciate your opinions on my best options.
Senior User
Joined: Jul 2002
Posts: 123
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From: Mt. Airy, MD
Def pre-turbo. Gives the best overall safety for high temps and shutting down. You have 2 options, a drill and tap in the exhaust manifold type, or the clamp-on type. The manifold really isn't that big a deal, did mine in about an hour, taking my time and taking deep breaths. I didn't take it off the truck to do it, just took my time, used grease and a magnet to get all the particles out. Been 2 years now.
Posting Guru
Joined: Feb 2004
Posts: 2,365
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From: IOWA
Yep, go with pre turbo. It's the most accurate and you know the temp of exhuast that the turbo is getting, instead of the after the turbo. I was like wlihntr and mounted the thermocoupler on the manifold while it was on the truck. Wasn't too difficult, except for welding upside down. I probably need to take it off and reweld it, as I know it's not the best weld, but I haven't had any issues with it at all.
Senior User
Joined: Dec 2003
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From: Albuquerque NM
Originally Posted by farmb0y
Yep, go with pre turbo. It's the most accurate and you know the temp of exhuast that the turbo is getting, instead of the after the turbo. I was like wlihntr and mounted the thermocoupler on the manifold while it was on the truck. Wasn't too difficult, except for welding upside down. I probably need to take it off and reweld it, as I know it's not the best weld, but I haven't had any issues with it at all.
farmboy I was wondering why you had to do some welding during your install? I also have my thermocoupler pre turbo and have not had any problems.
Elder User
Joined: Oct 2004
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BTW I just swapped my old post turbo unit for one that taps into the exhaust manifold. It reads about 250 degrees hotter, and shows ups and downs in the temp quickly.
Will a magnet pick up cast iron???
Originally Posted by sy5adm1n
Def pre-turbo. I didn't take it off the truck to do it, just took my time, used grease and a magnet to get all the particles out. Been 2 years now.
Postmaster
Joined: Jan 2004
Posts: 4,758
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From: colorado
Originally Posted by realhp
farmboy I was wondering why you had to do some welding during your install? I also have my thermocoupler pre turbo and have not had any problems.
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Posting Guru
Joined: Feb 2004
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From: Elverson, PA
Definitely another PRE-turbo vote. I have a clamp on style probe mounted in the up pipe right after the exhaust manifold. Not a bad install, though I never did one in the manifold - so I can't compare. Definitely put it pre-turbo - putting it post, IMO, is a waste of the money you spent on the pyrometer.
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Senior User
Joined: Dec 2003
Posts: 266
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From: Albuquerque NM
Originally Posted by wlihntr
some pyro kits come with a threaded coller that the probe screws into so if you would rather not tap the exhaust manifold you can drill a hole into it and then weld the coller over the hole
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by vancouverpower
BTW I just swapped my old post turbo unit for one that taps into the exhaust manifold. It reads about 250 degrees hotter, and shows ups and downs in the temp quickly.
Will a magnet pick up cast iron???
Will a magnet pick up cast iron???
I've been looking forward putting in it too... since i'm not mechanically blessed, i thought this would be better for my turbo.
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Freshman User
Joined: Nov 2003
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From: Kansas
Thanks
I will definately order the pre turbo guage. I am still a little nervous about cutting the hole. I now need to decide if I want to tap the hole or weld the bushing on. All I have is a 230v stick welder...that has burn thru written all over it!
I will definately order the pre turbo guage. I am still a little nervous about cutting the hole. I now need to decide if I want to tap the hole or weld the bushing on. All I have is a 230v stick welder...that has burn thru written all over it!
Senior User
Joined: Jul 2002
Posts: 123
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From: Mt. Airy, MD
TaosCowboy, just drill and tap. I was scared to death to drill into my brand new truck. I was thinking about the cost of a new manifold the whole time. I had thought about welding it in, but again, one burn through and either alot of welding up or a new manifold. Once I started, I just took my time, went slow and didn't rush it. Went smoothly. With the drill and tap method I was able to swap out my pyro recently without a problem. (I needed to split the signal to my gauge and my Edge Attitude).
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by TaosCowboy
Thanks
I will definately order the pre turbo guage. I am still a little nervous about cutting the hole. I now need to decide if I want to tap the hole or weld the bushing on. All I have is a 230v stick welder...that has burn thru written all over it!
I will definately order the pre turbo guage. I am still a little nervous about cutting the hole. I now need to decide if I want to tap the hole or weld the bushing on. All I have is a 230v stick welder...that has burn thru written all over it!
Tuned
Joined: Apr 2004
Posts: 306
Likes: 2
From: San Antonio, TX
I don't understand the difference in a pre-turbo kit and a post-turbo kit. I thought both should have a thermocouple with pipe thread so you could use it either way. I had mine post for a long while and just changed it, the difference is amazing. Its way more accurate than post-turbo set up.