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Old 03-24-2010, 06:29 AM
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EGT Probe Best Spot?

I'm putting a EGT probe in and the in the directions I have it says to put the probe in the manifold, but they guy I have putting it in says to put it in the down pipe off the turbo for best temps. The guy that's doing it for me used to work at a Ford Dealership as a master tech.

Which is best and what do you all recommend? Also what are normal operating temps?

Thanks.
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Old 03-24-2010, 07:55 AM
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My prob is in my manifold.... and the temps changes while you drive. normal highway driving i'd say between 700-850* and if your running it hard the highest you wanna let it hit would be 1200* but don't let it stay there long...
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Old 03-24-2010, 07:57 AM
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Most folks install them in the manifold.
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Old 03-24-2010, 08:14 AM
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Are you going to see must temp change if you put it in the down pipe past the trubo compared to the manifold? If so, I'll have to try and convince the tech to put it in the manifold!!!
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Old 03-24-2010, 08:22 AM
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I'm pretty sure the best place to put it is gonna be your manifold... i don't know anything about the temp readings if you put it in the downpipe as i have never done that...
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Old 03-24-2010, 08:36 AM
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Downpipe will be between 200 and 300* cooler.
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Old 03-24-2010, 08:55 AM
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A lot less accurate in the down pipe. A lot can happen from the manifold to the down pipe. I'd put it in the manifold. Its your money I'd have it my way
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Old 03-24-2010, 08:58 AM
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In the manifold obviously only measures on side tho. when I boutght my truck it was in the dp.
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Old 03-24-2010, 09:44 AM
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i have it about 2" behind the turbo... i feel better knowings its back there and i am getting a reading from all 8 cylinders and no junk can go through my turbo.

pretty sure most of the 'bigrigs' have it behind the turbo too.

cruising around i see 600 on a steady grade empty in 6th gear

if i were to do it into the manifold i would remove it first... but what do i know
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Old 03-24-2010, 10:21 AM
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Temps post turbo are less accurate. There is less fluxuation as well. it does only measure one bank of the exhaust but as others have posted there is little difference between the 2 manifolds when they have installed dual pyros. Most tempratures given are pre turbo so if you are seeing a 1200* egt post turbo you actually 1400-1500 pre turbo. I had no issue and probably half or more users have had zero issues drilling and tapping the manifold on the truck. 99% of the debris fall due to the design of a drill bit and the fact that you are drilling up (gravity). I had no issues doing mine 20k ago I drilled in 2 steps and did not use grease. Adding grease defeats the design of the drill bit. The turbo at idle is open so if there were some debris which would be really small it would pass thru the turbo with out a issue. Just because big rigs do something one way does not mean it works well for a 3/4ton or 1ton truck. Our trucks have a lot of smaller items. The service demands are also a lot different. It is apples to oranges. I'd want my gauge to be as accurate as possible. So pre turbo you will know for a fact. After turbo you can only guess if it is 100-300* off.
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