Diesel Do
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It may not be that critical that its precise, it could just need to be a step in the right direction! So the controller can operate better?
DD
DD
Davies Craig EWP - preliminary results
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Diesel Do
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Trip to maplins!
DD
DD
WLJayne
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That's just it, the pump is designed to respond appropriately to real temperatures - if it's not getting accurate temperature information then it's going to make "bad judgements." So hopefully it will perform better when properly calibrated
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Diesel Do
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If it makes it read ten degrees hotter then the controller should be able to do its job better? Maybe?
DD
DD
WLJayne
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Yes I think so. When you think about it, it seems a bit arse about face but I think it's right. The fans have been coming on alot lately and we know that they come on when the ECU reads 104, so its possible that because the pump thinks the temp is lower (and is therefore pumping less coolant around to encourage a temp increase) then the engine is getting hotter. So it might be hot instability rather than cool instability
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If you link a variable resistor (pot) across the sensor which I assume is of the PTC type and put it in a pan of boiling water. You can turn the pot until the display reads 100°C . This way you will be pretty close to within a °or 2 anyway. I'd then measure the resistance on the pot and select a fixed resistor/s to give a permanent correction!!
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How about a 20k variable resistor?
WLJayne
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I don't think they know, this is a relatively new tech and I don't expect they've had enough user feedback to get it perfect yet. They have updated the controller in the past and it's supposed to be much better now, so they are improving it over time.
Yep that was our plan
.That's what they suggested, any particular reason for the 20K figure? I don't know all that much about these components
.Will.
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Don't forget they say in parallel, not in series.
This would shunt directly across the sensor. I would imagine that 20k is a pretty high value, so as not to destroy the controller.
WLJayne
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Yes they very kindly included a wiring diagram with the email - so yes basically make sure it's parallel
!
Diesel Do
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Yes they very kindly included a wiring diagram with the email - so yes basically make sure it's parallel
If I remember correctly the total resistance in a parallel circuit is always less than the value of the lowest resistor! So you are actually lowering the value
which means it thinks its hotter cos the value decreases with temp rise!I need to get out more
DD
WLJayne
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If I remember correctly the total resistance in a parallel circuit is always less than the value of the lowest resistor! So you are actually lowering the value
Right. Gotcha. So how does that translate into us sticking bits to it, exactly?
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WLJayne
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just do what dc says
I'm just trying to get my head around the 20k value, why this and not say 10k or 30k? I'm just a little baffled as to why that number seems "good."
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I'm just trying to get my head around the 20k value, why this and not say 10k or 30k? I'm just a little baffled as to why that number seems "good."
it is to do with the impedance of the sensor. (no idea what that is), but DC should know the correct value. trust em. (initially)
Diesel Do
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They're trying to reduce the resistance! If it was in series it'd make sense cos you add the resistors together, simples. But put em in parallel it's a lot more complicated but it'll reduce the resistance by a set amount. Sooo......... Crap it makes sense to me
DD
DD
Diesel Do
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1 / R = 1 / R1 + 1 / R2
There ya go
DD
There ya go
DD
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Diesel Do
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I thought so
Measure the resistance of the sensor and you can calculate the resistance at any given temperature! What more do you want
DD
Measure the resistance of the sensor and you can calculate the resistance at any given temperature! What more do you want
DD
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