coozer
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| posted on 4/1/10 at 09:33 PM |
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MS temp sensor calibration?
Just a question to make sure I'm not going mad...
Just had me 2 zetec sensors in the fridge, under me arm then in the kettle...
So..
1. fridge both 77000 ohms
2. armpit both 25000 ohms
3. Kettle neck 2500 ohms
Anyone confirm this is correct please???
1972 V8 Jago
1980 Z750
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flak monkey
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| posted on 4/1/10 at 09:40 PM |
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These are the std ford temp sensor values, so not far out
 
Rescued attachment coolant temp sensor curve.jpg
Sera
http://www.motosera.com
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Madinventions
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| posted on 4/1/10 at 10:42 PM |
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Yep, they look about the same as mine. Thanks for the table Flak! It's always nice to have some definite values.
Ed.
Mojo build diary: http://www.madinventions.co.uk
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View my band website:
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paulf
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| posted on 5/1/10 at 12:46 PM |
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If you replace the bias resistors on the MS PCB with 27k ohm ones then there is no need to use easytherm. Lots of people seem to have problems with
easytherm corrupting the firmware and so changing the 2 resistors is the easiest method as long as you can solder confidently.
Paul
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flak monkey
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| posted on 5/1/10 at 12:50 PM |
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quote:
Originally posted by paulf
If you replace the bias resistors on the MS PCB with 27k ohm ones then there is no need to use easytherm. Lots of people seem to have problems with
easytherm corrupting the firmware and so changing the 2 resistors is the easiest method as long as you can solder confidently.
Paul
Thats interesting, might just try that.  I assume thats only applicable to the ford temp sensors?
David
Sera
http://www.motosera.com
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paulf
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| posted on 5/1/10 at 01:08 PM |
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Yes it applies to the ford spec sensors but other sensors can be used and the board modified to suit by changing the resistors.I could not get the
correct spec ones when i built the megasquirt on my car and so used some Peugeot ones and changes the bias resistor to suit them, I think I used
something like 3.3k .The air temp is the critical one as this directly affects the fueling whereas the water temperature one is only used for warm up
enrichment and can be made to work correctly if not exactly correct by changing the warm up enrichment tables.
If you have time to search the MS forums it is all listed on there but like most things on there takes a bit of time to find the correct info.
Paul
quote:
Originally posted by flak monkey
quote:
Originally posted by paulf
If you replace the bias resistors on the MS PCB with 27k ohm ones then there is no need to use easytherm. Lots of people seem to have problems with
easytherm corrupting the firmware and so changing the 2 resistors is the easiest method as long as you can solder confidently.
Paul
Thats interesting, might just try that. I assume thats only applicable to the ford temp sensors?
David
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