After Turbo Probe - Ford Powerstroke Diesel Forum
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Old 12-04-2007, 07:33 PM
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After Turbo Probe

Howdy all!!! I'm new to the site and finally figured out how to post, I think.

My question is: what are the temperature differences between installing a probe pre and post turbo? does it really matter or can you have a probe installed on your down pipe right after the turbo???

thanks
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Old 12-04-2007, 07:37 PM
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Yes it does make a difference. To get the best readings you want your probe pre-turbo in the manifold. Your temps will read a couple hundred degrees cooler post turbo. I dont know exactly how much of a difference in temp is though
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Old 12-04-2007, 08:03 PM
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I think it reads about 300-500 degrees cooler if you put it in the downpipe
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Old 12-04-2007, 08:07 PM
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the nornm is to go pre turbo


welcome to the site!!!!
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Old 12-04-2007, 08:45 PM
Is it even worth it???



 
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Welcome to Powerstroke.org


There is a significant difference in the temperatures between the two locations. I believe those who have had probes in both, have stated at least 300*.

A probe located before the turbo is most accurate, however, if you must for whatever reason locate the probe post-turbo, remember that you will need to adjust the maximum levels you are willing to see on your gauge downward to compensate.
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Old 12-04-2007, 08:49 PM
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a post turbo probe will always read at least 150-200 degrees cooler.....BUT it will also respond slower and more inaccurately...so while crusing it may be200 degrees cooler...at WOT when it respnonds way slower it could be as much as 4-500 degrees off.....its a tough number to say cause it will be different depending on how its being driven...
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Old 12-04-2007, 08:50 PM
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There is a huge difference. I acully have both post and pre. My post turbo can be at 300 and my pre be at 1200.. my post turbo never gets above 550
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Old 12-04-2007, 09:19 PM
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Thanks for the advice guys I bought this truck back in sept. and the egt was installed on a bung on the down pipe right after the turbo. should I buy a new probe or just reuse the current one. I had a very strong feeling that was in the wrong place and needed to installed on the exhaust manifold.
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Old 12-04-2007, 09:29 PM
Is it even worth it???



 
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You can reuse the probe.. but you may need a new bung, or will need to tap the manifold. You will also need to plug the existing hole.. but that should be as simple as screwing in a pipe plug.
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Old 12-04-2007, 09:51 PM
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Not sure if you can use the old probe but just wanted to say welcome. I grew up in Yakima.

Moon
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