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Old 05-14-2007, 05:53 PM   #1
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Default Sensor location

Im in the process of installing MSII v3.0 with EDIS in my 90 miata. I am looking for ideas on the best locations for the temp sensor and IAT sensor.
TIA
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Old 05-14-2007, 06:07 PM   #2
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Coolant temp anywhere you can get to flowing coolant... I've always used the stocker.

IAT, just before the throttle body in the intake plumbing.
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Old 05-14-2007, 07:02 PM   #3
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Put my coolant one here:



when stock the IAT was here:



and with the charger it's now here:



HTH
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Old 05-14-2007, 08:46 PM   #4
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good pics. I'd like to see where other people put the sensors too.
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Old 05-14-2007, 08:57 PM   #5
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Old 05-15-2007, 08:13 AM   #6
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I have my CLT in the upper radiator hose (adapters at $20 on Ebay) and the IAT in the Xover tube.

I'll snap a pic tonight.
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Old 05-15-2007, 02:56 PM   #7
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Quote:
Originally Posted by ecugrad View Post
I have my CLT in the upper radiator hose (adapters at $20 on Ebay) and the IAT in the Xover tube.

I'll snap a pic tonight.
won't that give an inaccurate reading, due to being after the thermostat not before it
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Old 05-15-2007, 03:40 PM   #8
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Quote:
Originally Posted by richyvrlimited View Post
won't that give an inaccurate reading, due to being after the thermostat not before it
Depend on your definition of "inaccurate" is.

This will report the HOTTEST reading possible from how I understand the water flow. The water flowing past the sensor, just came out of the head and hasnt hit the radiator yet. The only problem I have is the car isnt happy running hard until the t-stat opens.

I dont know if there is a right or a wrong answer on this one. This was the easiest for me to tap into.

Anyone else care to chime in?
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Old 05-15-2007, 04:10 PM   #9
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Quote:
Originally Posted by ecugrad View Post
Depend on your definition of "inaccurate" is.
err, not accurate, not precise etc.... :P

Quote:
Originally Posted by ecugrad View Post
This will report the HOTTEST reading possible from how I understand the water flow. The water flowing past the sensor, just came out of the head and hasnt hit the radiator yet.
but until the t-stat opens you're not getting a reading of the *actual* engine temp, which is the most important thing as this is one of the sensors the ECU uses to determine how much fuel is required, is it in warmup mode etc

Quote:
Originally Posted by ecugrad View Post
The only problem I have is the car isnt happy running hard until the t-stat opens.
probably cos the ECU thinks the engine is colder than it actually is, see above

Quote:
I dont know if there is a right or a wrong answer on this one. This was the easiest for me to tap into.

Anyone else care to chime in?
there is definately a right and wrong answer and I think the fact that your car tuns like toss until the T-stat opens is evidence of which is correct.
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Old 05-15-2007, 08:31 PM   #10
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Attached Thumbnails
Sensor location-ait.jpg  
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Old 05-15-2007, 08:38 PM   #11
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Old 05-22-2007, 05:55 PM   #12
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whats the coolant sensor for??for knocksense?
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Old 05-22-2007, 05:59 PM   #13
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coolant based advance/retard & fueling (cold start enrichment)

and dont you wanna be able to log your coolant temps or anything else you possible can?
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Old 05-22-2007, 05:59 PM   #14
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very clean Al. Love the heatshield.
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Old 05-22-2007, 06:04 PM   #15
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Quote:
Originally Posted by Braineack View Post
coolant based advance/retard & fueling (cold start enrichment)

and dont you wanna be able to log your coolant temps or anything else you possible can?
and this applicable to pnpms?
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Old 05-22-2007, 06:30 PM   #16
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Quote:
Originally Posted by castillejos2000 View Post
and this applicable to pnpms?
no the PnPMS utilises the stock sensor with an edit of the settings (all automatic)

I fitted the GM sensor to save that hassle
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Old 05-22-2007, 06:30 PM   #17
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Quote:
Originally Posted by castillejos2000 View Post
whats the coolant sensor for??for knocksense?
errr so the ECU knows how hot/cold the engine is.....
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