Egt probe; post turbo or per torbo? - Ford Powerstroke Diesel Forum
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Old 02-20-2013, 03:44 PM
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Egt probe; post turbo or per torbo?

Was told today the manifold was better. If so, which side and where? Also told downpipe is inaccurate.


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Old 02-20-2013, 04:33 PM
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Exhaust manifold is the only accurate place. Most put it just before the up pipe. Driver side manifold is easier to access.


Temps in the down pipe vary too much to be used reliably. One day they may be 200* lower than manifold temps, the next day could be 400*+ lower.

Last edited by Tj Krawler; 02-20-2013 at 05:34 PM.
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Old 02-20-2013, 07:23 PM
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I agree with Tj,
I also read somewhere that the drivers side is the manifold you should tap into.
For some reason - this side is a bit hotter than the passenger side.
Why I don't know - but there was a another thread where a couple people verified that
by running seperate probes on each manifold.
So they say just use the Drivers side to get your 'highest' temp readings.
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Old 02-20-2013, 07:25 PM
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Pre turbo I run dual pyros and mine is between 50-100 hotter on the drivers side.
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Old 02-20-2013, 09:41 PM
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Egt probe; post turbo or per torbo?

That makes it even easier. Thank you for the replys.


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Old 02-21-2013, 07:30 PM
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You want the temp reading before the turbo, my brother explained that the temp is lower because the pressure is lower after the turbo. Pressure (heat) is higher before the turbo because pressure is what spins the turbo, and the turbo pressure (heat) is lower when it discharges that heat, thats why the best place to read the temp (EGT) is before it goes in the turbo.

Heat=pressure

Higher pressure into the turbo, lower pressure coming out.
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Old 02-23-2013, 12:59 AM
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This is something that has got me thinking swell, over here on all out diesel 4x4s its unheard of putting a pyro in the manifold, they all go in the dump pipe, (my old nissan patrol had it in the dump) but everyone on here says manifold, I went to a exhaust shop and got told to put it in the dump as the manifold is a big lump of steel and can possibly heat soak the sensor and being a big lump of steel will take longer to heat up and cool down, havent fitted it yet butthink I'll just put it in the manifold as that what everyone reads on off here so might make diagnosis a bit easier if I ever have problems and ask for help here
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Old 02-23-2013, 12:24 PM
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Egt probe; post turbo or per torbo?

The probe is sticking in the exhaust stream, constantly varying with the amount of fuel being delivered, listen to us, not them!!!


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Old 02-25-2013, 11:15 AM
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Also the driver side manifold offers the cleanest wiring (out of sight) if looks matter.
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Old 02-25-2013, 07:44 PM
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Quote:
Originally Posted by AUSPowerstroke View Post
This is something that has got me thinking swell, over here on all out diesel 4x4s its unheard of putting a pyro in the manifold, they all go in the dump pipe, (my old nissan patrol had it in the dump) but everyone on here says manifold, I went to a exhaust shop and got told to put it in the dump as the manifold is a big lump of steel and can possibly heat soak the sensor and being a big lump of steel will take longer to heat up and cool down, havent fitted it yet butthink I'll just put it in the manifold as that what everyone reads on off here so might make diagnosis a bit easier if I ever have problems and ask for help here
Here is another thing too think about, I was into drag racing Mustang's a few years back and turbocharging was getting big, those guys have a EGT at every cylinder, they use those temps too help tune the motor. They don't use the temp reading after it passes the turbo. I think the ideal spot is where the "Y" pipes feed into the turbo but what a pain in the butt that spot is unless you want too take the turbo out.
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