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Old 04-14-2014, 11:09 AM   #1
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Default EGT probe placement

Many conflicting ideas on the Internet about this. Should I be placing the probe in #1, #3 or #4 on the manifold?
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Old 04-14-2014, 01:23 PM   #2
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In the collector.

If you put it in just one runner, you only get info on that one cylinder.
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Old 04-14-2014, 04:58 PM   #3
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I do realize 4 is best. I'm only installing one. I was hoping to get some input on my hottest. I've read 1, 4 and 3. I'm guessing someone has just one installed and can tell me which is hottest in a miata.
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Old 04-14-2014, 05:36 PM   #4
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Number four will be the hottest.

Do you have EGR still installed and or working?
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Old 04-14-2014, 05:53 PM   #5
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Quote:
Originally Posted by Miater View Post
Number four will be the hottest.
Why is that?
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Old 04-14-2014, 06:21 PM   #6
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Personal experience, lots and lots of threads in many different forums discussing the topic. The Miata coolant route issue, intake manifold design, less fuel(single feed rail) on that cylinder.

This has been gone over many times, usually with people standing on one side or the other.

Here is just one thread that covers it pretty well.

Myth "Cylinder #4 EGT is hottest": Busted! - MX-5 Miata Forum
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Old 04-14-2014, 06:21 PM   #7
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I'm installing it at the same time as the egt.

Quote:
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Number four will be the hottest.

Do you have EGR still installed and or working?
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Old 04-14-2014, 06:26 PM   #8
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In that thread, I specifically pointed out that #4 is in fact, NOT the hottest. In my case, #1 is. That may or may not be your case, unless you have direct evidence for it.

So, #4 is not the hottest, unless you can prove it.
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Old 04-14-2014, 07:23 PM   #9
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I put mine right in the middle of the collector.
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Old 04-14-2014, 08:37 PM   #10
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I put mine in the turbine housing, just after the manifold/turbo union. Same idea as collector, I just didn't want to drill and tap into the nice ceramic coated manifold.
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Old 04-14-2014, 08:42 PM   #11
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What kind of numbers do you see from that location?
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Old 04-14-2014, 09:18 PM   #12
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Very good info, thanks! I'll give someone a dollar for a pic of their probe in #4 on an NA. (insert your joke there)
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Old 04-14-2014, 11:10 PM   #13
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Do you have a pic by chance?
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Old 04-14-2014, 11:14 PM   #14
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I've got mine on #3 a couple inches after the flange.
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