Pyrometer probe location? - Ford Powerstroke Diesel Forum
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Old 01-29-2010, 06:46 PM
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Pyrometer probe location?

Is it better to have the pyrometer probe located before or after the turbo? I have heard that pre turbo gives the most accurate exhaust gas temp. Also, what is a good brand of gauges and pillar pods.
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Old 01-29-2010, 06:56 PM
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PRE turbo is the way to go.

ISSPRO for the gauges, IMO
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Old 01-30-2010, 03:01 AM
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Pre turbo all the way...it really doesn't make much difference what the temps are after the turbo since the gasses going into the turbo is what can hurt it.

My pyro and a-pillar pod are both from Autometer...it's really more of a preference thing I think. Just decide what you think will look the best and want to look at when you are driving.
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Old 01-30-2010, 06:50 AM
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Egt Probe Placement ???

Last edited by Calkidd; 01-30-2010 at 06:55 AM.
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Old 01-30-2010, 07:02 AM
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mine didnt have instructions, well it basically said pick a spot and stick it..which didnt help much, i put mine just past the last port on the bend of the manifold just before it connects to the up-pipe, anything after that point and the exhaust only gets cooler so its a prime spot.. just be careful, the fitting is a pipe thread, tap too far and you'll run out of threads on your fitting,

another quick tip, put some grease on your tap so the metal filings stick to it and are not in your manifold,
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Old 01-30-2010, 07:06 AM
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always pre turbo. thats the hottest point that you want to monitor. getting it too hot can cause some issues with the parts on the engine.


i recommend ISSPRO gauges. they are decent and look great!
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Old 02-03-2010, 09:49 AM
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Here is a brief write up on pre-turbo and post-turbo. And I always recommend ISSPRO gauges, but I'm a bit biased

Pre-turbo or Post-turbo thermocouple installation?

Clearly the manifold (pre-turbo) installation is better in almost all circumstances. Many people from the "old days" worry about thermocouple tips breaking off and chewing up the turbo. This fear is a relic from the days of exposed-junction thermocouples (the type still used in laboratories). For 40+ years the automotive standard has been to encase the thermocouple junction in a welded sheath of high-temperature stainless steel. More recently they have also been made out of Inconel stainless, which is rated for continuous use at 2000 F. Here at ISSPRO we have not had a single report of a sheathed-design thermocouple breaking and damaging a turbo, with over 40 years of history.

Measuring pre-turbo tells you more about the temperaures your pistons are seeing, as well as the worst case temperature of your turbo. The temperature difference between pre- and post-turbo can vary anywhere from +500 F (pre-turbo much higher when under heavy load and temps rising quickly) to -100 F (post-turbo hotter immediately after starting downhill after a hard pull uphill).

The only time we see post-turbo measurements as preferable is when monitoring the turbo temperature during shutdown. As the turbo cools off, it is being cooled by the exhaust gases at no-load (which are now cooler than the turbo). These gases get heated up as they cool off the turbo, so you actually see a warmer temp post-turbo. However, the difference between pre- and post-turbo temperatures is minimal by the time the turbo has cooled to around 300 F (which is where most people shut down). In other words, post turbo lets you see the cooldown progress better, but it is nearly identical to the pre-turbo reading by the time you reach the shutdown temperature.

Regards,
Michael Pliska
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Old 02-06-2010, 07:30 AM
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Thats a nice little write up. I was always curious of the difference in EGT temps pre and post turbo.
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