karlak
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| posted on 3/5/15 at 07:19 AM |
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Another relay query - Omex & Fan
OK,
I have had an "over-ride" switch put on the dashboard to switch the radiator fan on, this was to hopefully work alongside the Omex 600
which has been set to 90 degrees ON & 92 degrees OFF.
I got the car out yesterday and ran around the yard. The temp display is shown on a ETB digidash2, which showed it go above 90degs, I popped the
switch on and the fan came on fine and started to cool it down.
I need to chat to the guy who wired up the Relay for me and make sure it is all correct, given the Omex fan feed and the over-ride switch. In the
meantime, can someone please provide a diagram of how it should be setup please. I suspect that either the feed from the omex has become disconnected
or maybe not reading the water sensor correctly. If I can at least check the wiring to the relay, it will be somewhere to start,
Cheers 
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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loggyboy
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| posted on 3/5/15 at 07:44 AM |
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Could just be the omexs interpretation of 90 is different from the digi dash. Did you try to get the temps much higher than 90 before engaging the
overide?
Mistral Motorsport
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karlak
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| posted on 3/5/15 at 07:57 AM |
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quote:
Originally posted by loggyboy
Could just be the omexs interpretation of 90 is different from the digi dash. Did you try to get the temps much higher than 90 before engaging the
overide?
The temp on the digidash hit 99 before I popped the fan on. I am back there at the workshop today, so will try and get the live data for the OMEX on
my Laptop (think it is possible), to see what OMEX thinks it is seeing.
Must admit to struggling with Relays, just cant get my head around them. Need a dummys guide I think
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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britishtrident
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| posted on 3/5/15 at 12:09 PM |
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I think that should be 92 On and 90 Off but that is too close together the fan will cycle on off on off too quickly.
You need about 4 degrees separation between the and the Off should be at about 4 degree above the thermostat starts to open temperature.
So for an 88 degree thermostat the fan going on at 96 and off at 92 is about right.
99c is not hot for a modern engine most modern tintop fans don't start until 105c and and many don't full speed until over 112c
On modern production car temperature gauge is just an indicator not a true gauge as the reading is controlled by the ECU typically it will remain
fixed on "N" between 75c and 108c or more.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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gremlin1234
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| posted on 3/5/15 at 01:08 PM |
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quote:
Must admit to struggling with Relays, just cant get my head around them. Need a dummys guide I think
they are just electrically
actuated switches
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karlak
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| posted on 3/5/15 at 04:07 PM |
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Cheers Guys,
I think it is sorted now. I ran it a bit hotter and the ECU switched the fan on, so either ETB sensor is reading high, or the Omex sensor is low
The ETB uses its own sensor and the Omex uses the standard Duratec one (I think), which I have been told should be fine. So it could be the sensors
are not showing correctly, cant check the omex live data as I need to find may serial extension lead.
On a Run the temperature seemed to fluctuate between 96 and 99. This seemed to happen on a dual carriageway run or whether on a "normal"
drive.
Done some reading on the relays and now have it clear how they work
Having just got the car back on the road after a long layoff and loads of changes, engine, steering, ignition, fuelling etc etc, I may well have a few
more questions coming along . What I do know in the brief drive back home from the workshop is,,,,,, it is now a very different beast to the one I
drove almost 4 years ago now. 4 years !! couldn't believe it, but in my defence we have had a few issues to deal with over the past few
years...
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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