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Old 05-25-2016, 10:17 AM   #1
SubasaurusWrex
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Member#: 70285
Join Date: Sep 2004
Location: Schaumburg, IL
Vehicle:
2011 JCW Mini
Midnight Black/Red roof

Default GM IAT: No more guessing

Tuning the GM IAT sensor has gone fairly smoothly, but I've been using off the shelf parameters since I began tuning speed density. I finally got around to modifying a GM closed element sensor, and soldering in my own probe. It's hooked up to an LCD, and refreshes every 1-2 seconds.

http://i.imgur.com/joVSX9N.jpg

The whole shebang cost me about $20.
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Old 05-25-2016, 12:15 PM   #2
mrsaturn7085
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I would be scared to death running something like that post-I/C...

What was the purpose of eliminating the GM open-air cage and element? They are pretty accurate, and the range of fuel comp. between 0 and 60 deg C is only like +14.5% to -6.0% (w/40 deg C center).
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Old 05-25-2016, 04:32 PM   #3
SubasaurusWrex
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This was a closed element I had lying around. I did it because I felt something was off on my readings, and this confirmed it. Was reading 10-15 degrees lower than actual.
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Old 05-26-2016, 01:36 AM   #4
murrdogg24
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2020 STI
Crystal White Pearl

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ballsy
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Old 06-01-2016, 02:47 PM   #5
no694terry
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mine on a cold engine in my manifold reads the same as my stock coolant temp. then once i fire it up, they part ways
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Old 06-01-2016, 04:51 PM   #6
mrsaturn7085
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Quote:
Originally Posted by SubasaurusWrex View Post
This was a closed element I had lying around. I did it because I felt something was off on my readings, and this confirmed it. Was reading 10-15 degrees lower than actual.
How was it reading 'off'? The IAT reading is taken as a voltage divider through a thermistor...

Are you saying that the resistance values were different than the GM white papers, or are you saying that the closed element sensor was just too slow?

In either case, I think you would be a lot safer running an open-cage IAT and calibrating it to your installation using hot water immersion and a cheap lab thermometer. Takes about an hour and is well-worth it if you care about the 1.5% fueling error 10-15 deg C will cause.

...if you are talking 10-15 deg F, that is well within the tolerance of this kind of thermistor and will be a fraction of a percent off, in terms of fueling.
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Old 03-27-2020, 02:49 AM   #7
contaminatrix
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45A, originally 18L

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nothing wrong with this diy unit in my eyes if i'm asked. how did it perform?

#necrobump
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