Major Stare
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 posted on 22/5/06 at 12:51 PM |
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Will MegaSquirt work with this sensor?
Would my MegaSquirt work with the existing water temperature sensor in my X-Flow?
I would then fit another sensor for the gauge in the top hose using an after market T peice.
Jon "FISH"
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BKLOCO
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| posted on 22/5/06 at 12:55 PM |
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quote:
Originally posted by Major Stare
Would my MegaSquirt work with the existing water temperature sensor in my X-Flow?
Yes.
It will work with any resistive temp sender.
Experience is what you get when you don't get what you want!!! 
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Major Stare
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| posted on 22/5/06 at 01:05 PM |
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Cheers,
How do i know if its resistive ?
Jon "FISH"
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tks
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| posted on 22/5/06 at 01:07 PM |
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Sensors
it means
useing a resistance in practic any is!
in theorie there also i2c ones or serial ones etc. etc.
Depending on the resistance of it and its curve you might need to alter the mega squirt installation.
but as always if you aren't the first whoes gonna make it just copy..
Tks
The above comments are always meant to be from the above persons perspective.
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BKLOCO
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| posted on 22/5/06 at 01:26 PM |
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If it's the standard ford sensor it's resistive.
Are you using MS I or MS II?
In MS I you will use a little utility called Easy therm to calibrate your sensor.
If you are using MS II then you calibrate directly in MegaTune (easy to do with thermometer saucepan of water and multimeter in either version)
The MS instructions talk about changing resistor values to calibrate the sensors.
You should NOT use this method it is less accurate than the software method. (Despite what some people claim)
[Edited on 22-5-06 by BKLOCO]
Experience is what you get when you don't get what you want!!!
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Major Stare
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| posted on 22/5/06 at 01:43 PM |
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I have MS V2.2 and MegaTune installed on my laptop.
Water temp sensor is the last item to wire and im struggling to find a suitable method to fit a Ford Zetec sensor, so wanted to use the existing gauge
sensor.
Jon "FISH"
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Major Stare
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| posted on 22/5/06 at 03:34 PM |
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Hi Mark,
Yes, the existing x-flow temp sensor is mounted before the stat, just wanted to know if it was suitable.
I will then mount another sensor to feed my water gauge on the top rad hose, not ideal, but the easiest option.
???
Jon "FISH"
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Major Stare
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| posted on 22/5/06 at 07:38 PM |
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The temperature unit i have is the same that mccorney is currently selling in the for sale section.
Will this work?
Picture here..............
[img]http://www.locostbuilders.co.uk/viewthread.php?action=attachment&tid=45415&pid=377428[/img]
Jon "FISH"
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paulf
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| posted on 22/5/06 at 08:32 PM |
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I decided that the existing gauge sensor was to low a resistance to use as it measured 180 ohms at 20 degrees rather than 3000 for the recomended
sensor.
I left it in place and fitted a Bosch sensor from a Vauxhall which is nearly the correct resistance and can be fine tuned with easytherm.
There is a drain plug on the crossflow above the starter motor position,I screwed it in there with a threaded adaptor to match the threads.
Paul.
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Major Stare
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| posted on 22/5/06 at 08:43 PM |
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Paul,
Never heard of that sensor location point.
Do you have any details about the adaptor.. where to buy etc?
I have a Ford Zetec sensor which may suit.
Jon "FISH"
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paulf
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| posted on 22/5/06 at 08:59 PM |
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u2U sent.
quote:
Originally posted by Major Stare
Paul,
Never heard of that sensor location point.
Do you have any details about the adaptor.. where to buy etc?
I have a Ford Zetec sensor which may suit.
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CairB
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| posted on 23/5/06 at 12:04 PM |
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Ford sensors have a different resistance range to GM.
You change the series resistor to bring the relationship between temperature and voltage into a sensible range for the megasquirt to measure.
Easytherm can then be used by setting the new resistor value and entering 3 calibration points. It then generates a table to download.
I used the sensor that came with the engine, changed the resistor to a better value and recalibrated (47k from memory). 34.7k actual (bad memory
 )
If you do a search of the msefi site someone has kindly posted the resistances of the popular sensors.
[Edited on 23/5/06 by CairB]
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Major Stare
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| posted on 23/5/06 at 01:54 PM |
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Crickey. 
Starting to wihs i'd never started this damn project
Jon "FISH"
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Major Stare
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| posted on 25/5/06 at 03:39 PM |
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Cheers guys, a wealth of info as usual
Had a quick look at e-Bay and saw
THIS VAUXHALL
SENSOR
If i fit this, then i need to do hardly any tweeking in MS ?
Jon "FISH"
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paulf
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| posted on 25/5/06 at 09:30 PM |
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Thats the one I have used , I fitted 2.4k bias resistors instead of 2.49k and have not altered any other settings.It is working ok but reads about 5
degrees lower than the mechanical gauge in the car, i really should measure the resistance at 0 and 100 degrees and make the fine adjustmeents with
easy therm, but havent as it is working ok but I only have the car roughly mapped at present.
Paul
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MikeRJ
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| posted on 27/5/06 at 09:45 AM |
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The one wire sensors normaly connected to a water temperature gauge are not really suitable for use with an ECU because:
1) The resistance to generaly far too low, and
2) the ground return via the engine block ground voltage will vary according to battery charge current etc. which won't give a stable
temperature reading (good enough for a gauge obviously).
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