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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6490
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Mon Dec 31, 2018 5:51 pm    Post subject: How accurate is the 996.1 coolant temperature gauge? Reply with quote

Not very...…



It isn't even clear to me what the indicators on there are supposed to be. the 80 is clear, but I would have thought it was from left to right maybe:
40, 60, 80, 100, 120. But it seems not.


Open Youtube Page


I'm now hatching a plan to change the scaling so that it reads better.

MC

Last edited by MisterCorn on Mon Dec 31, 2018 7:33 pm; edited 1 time in total
 
  
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T8
General
General


Joined: 29 Jun 2010
Posts: 14815
Location: Kent


PostPosted: Mon Dec 31, 2018 6:01 pm    Post subject: Reply with quote

Had you seen this Question

--> http://911uk.com/viewtopic.php?t=81945&start=0&postdays=0&postorder=asc&highlight=coolant+temperature
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2007 Guards Red 997 Turbo Tiptronic
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6490
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Mon Dec 31, 2018 6:06 pm    Post subject: Reply with quote

Yes Terry, but it doesn't tell me what I wanted to know. This is part of a plan to convert my instruments to show either coolant or oil temperature. First part was to understand how the actual coolant temperature corresponded with sensor voltage, and what voltages are required to get the pointer to various places. Next stage is the oil temperature part.

MC
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14678
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Mon Dec 31, 2018 6:28 pm    Post subject: Reply with quote

Why don't you fit a digital display where the gauge is?
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5748
Location: Brighton


PostPosted: Mon Dec 31, 2018 7:16 pm    Post subject: Reply with quote

Ive searched but have not found a graph of the ntc resistances at set temps im afraid ..

The only base line one i found for a 996 is approx 1K at 20 degrees.

Image below is all Porsche say on these sensors and its pretty generic.

What i can say .. i look at a tester for the temp value .. i see the gauge read 80 at about 75 .. i see the gauge read 80 at about 85 .. give or take.

My thinking is Porsche dont want owners worrying about small deviations in temp so they hold it at 80 on the gauge.

Obviously an Ntc is a set resistance at set temps so the gauge must be dampening for want of a better word the output on the temp gauge .

If you cant bypass this effect then you would need to use a seperate temp gauge .

We dont get taught this stuff so its just guess work on my behalf though .
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MisterCorn
Long Beach


Joined: 08 Jan 2011
Posts: 6490
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Mon Dec 31, 2018 7:28 pm    Post subject: Reply with quote

I don't want a digital gauge, I want the analogue one to accurately reflect the coolant temperature. Now that I know the parameters for the standard sensor I can do this, along with enabling it to switch to show oil temperature on demand.

MC
 
  
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Dammit
Kyalami


Joined: 23 Sep 2016
Posts: 1962



PostPosted: Tue Jan 01, 2019 1:29 pm    Post subject: Reply with quote

OEM+
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