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Old 12-01-2001, 07:49 AM   #1
Scooby Specialist
Member#: 9891
Join Date: Sep 2001
Chapter/Region: South East
Location: New Orleans, LA
2015 RC-F
Ultra White

Default egt sensor placement?

is everyone putting their aftermarket egt sensor in the downpipe? i think i saw somewhere an uppipe with an extra bung for an egt sensor, but i have also seen a downpipe with an extra bung for the sensor....which ones best?

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Old 12-01-2001, 08:19 AM   #2
Rocky WRX
Scooby Specialist
Member#: 9837
Join Date: Sep 2001
Location: Evergreen CO
2002 White WRX Wagon
7800 ft


You can put your EGT sensor anywhere you want, and it will give you exhaust readings. The downpipe is a 'safe' location in that if your sensor fails and physically disintegrates, it won't damage your turbo. The downside is that it's further away from the cylinders, so the peak temps you read will be significantly lower (200-300 deg) than if you placed the sensor in your up pipe or manifold.

Others prefer to install their sensor in an aftermarket up pipe bung (easy, and gives higher readings) or to drill and tap a hole in one of the stock manifolds, which gives the highest, most accurate readings, but may not cover all cylinders if placed upstream of a collector. The drivers side manifold is pretty easy to pull, the passenger side a little more difficult, but many think putting the sensor at cylinder #3, the 'leanest' running cylinder, which is the rear passenger cylinder, is the best place.

I put mine in the passenger manifold collector, just before my stock up pipe.

Do a search, you will find a wide variety of opinions.
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Old 12-01-2001, 12:44 PM   #3
Scooby Specialist
Member#: 7536
Join Date: Jun 2001
Location: San Jose
2005 WRX STi


Great collected info. from Rocky.
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Old 12-01-2001, 12:48 PM   #4
Scooby Don't
Scooby Newbie
Member#: 7449
Join Date: Jun 2001
Location: Long Beach, CA
2002 WRX


I asked Shiv the same question and here is his response (Thanks Shiv):

I suspect that cyl #1 will be the trouble cylinder with the new age WRX. That's the passenger side front (closest to front of car). I'd recommend mounting in that exhaust runner just a few inches after the exhaust port.

One more opinion from a highly reputable source,
Scooby Don't
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