Kriss
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| posted on 18/1/10 at 03:39 PM |
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Guide to wiring a fan over ride??
My car has a R1 engine with polo rad and an electric fan which comes on automatically in traffic. It come son at about a dash indicated 97 deg ish!
I have a savage swtch (pic of a fan) which is wired in so much as it lights up, however the infamous BEC Centre never wired it to actually control the
fan as an over ride, say the ECU does it! So why buy, wire, install give me a switch then dickhead?
Anyways, how would i go about wiring this in? Would i need to splice into the fan wires and drop in new cable to power it fromt he switch?
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Mr Whippy
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| posted on 18/1/10 at 03:42 PM |
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97 degs sounds about right, 110 degs is getting high, mind it’s pressurised to go over 100 degs
Ain’t that fan switch meant to be for a demister? Suppose if you decide to fit one, which you need for the MOT if you had a windscreen
This temperature thing comes up quiet a lot it seems, probably cos production cars don't tend to have numbers on the gauge, just coloured
bars.
[Edited on 18/1/10 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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Kriss
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| posted on 18/1/10 at 03:46 PM |
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Im pretty sure it was bought for and is meant to be for a fan over ride.
Have no windscreen and it would be a nice control to have in traffic
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hicost blade
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| posted on 18/1/10 at 03:47 PM |
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You need a 3 position switch:
Position 1: Controller on
Position 2: off
Postion 3: bypass controller (power straight to fan)
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Mr Whippy
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| posted on 18/1/10 at 03:54 PM |
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if it comes on itself at the right temp then no problem. If you make it manual I can guarantee at some point you'll forget to turn it on, I know
people who have does this 
Especially if it’s the ECU that’s controlling the fan, it'll be part of the programming and the mixture will be getting leaned out as the engine
gets hot (my bike does this) to reduce emissions. Like I said there isn't an overheating problem anyway.
Over cooling the engine will lead to increased carbon & soot deposits on the valves and cylinder head plus reduced power and increased fuel
consumption.
Fame is when your old car is plastered all over the internet
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Richard Quinn
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| posted on 18/1/10 at 03:56 PM |
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He's not after changing to manual, just providing a manual overide.
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dan__wright
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| posted on 18/1/10 at 04:04 PM |
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i cant remmebr if the ecu provides earth or 12v, you would need to check.
you then wire a one side of the switchg into the wire from the ecu to the relay and the other side of the switch to the same source as the ecu
provides (gnd or 12v)
ig if the ecu is switched ground, you would wire ground > savage switch > into wire from ecu to relay, this will activate the relay when the
switch is on but allows the ecu to also turn it on, as the ecu and switch provide the same voltage it wont damage the ecu.
make usre you get it correct though or you will probably pop the fan circuit in the ecu.
FREE THE ROADSTER ONE…!!
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Mr Whippy
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| posted on 18/1/10 at 04:04 PM |
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quote:
Originally posted by Richard Quinn
He's not after changing to manual, just providing a manual overide.
Dead easy - Just do this wiring replacing the lamps with the fan motor. Don’t wire the switch directly as it will explode or burst into flames with
that much current.
Fame is when your old car is plastered all over the internet
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dan__wright
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| posted on 18/1/10 at 04:07 PM |
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quote:
Originally posted by Mr Whippy
quote:
Originally posted by Richard Quinn
He's not after changing to manual, just providing a manual overide.
Dead easy - Just do this wiring replacing the lamps with the fan motor. Don’t wire the switch directly as it will explode or burst into flames with
that much current.
but then the ecu wont switch it, just the switch, he needs to wire the switch and ecu in parallel
FREE THE ROADSTER ONE…!!
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speed8
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| posted on 18/1/10 at 05:01 PM |
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On the 03 R1 the ECU goes to ground to start the fan.
To fit an overide
find the fan relay,
find the wire that goes to ECU,
splice a wire into that one and run it to your switch (to check it put the spliced wire to ground and fan should start).
Run a wire from the other side of your switch to ground and hey presto you should have an overide.
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Kriss
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| posted on 18/1/10 at 05:45 PM |
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Cheers guys, will take a look, I know if its aint broke fix it, but also would be good to have it working in the summer.
yup - its an '03 5PW
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corrado vr6
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| posted on 18/1/10 at 07:15 PM |
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Hi mate i took this advice when i did my over ride switch using the bikes fan relay, took the pic from a previous post hope they dont mind
for 02-03 model by taking the green/yellow to earth
 
0203 Fan Overide
here is the actual thread if you wanted to have a read HTH Greg
http://r1indy7.wordpress.com/
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britishtrident
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| posted on 18/1/10 at 08:55 PM |
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97 is about right the coolant won't boil until 120+c.
Best not to add complexity to the wiring which only like to make less reliable, if you want the fan to cut in earlier fit a lower temperature switch,
[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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Mr Whippy
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| posted on 19/1/10 at 08:30 AM |
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well as stated yesterday, fitting a fan over ride is not necessary even in summer as the fan comes on at just the right temp and will do then too, so
switching on the fan manually will be off no benefit whatsoever and infact over cool the engine which isn't good for it.
Fame is when your old car is plastered all over the internet
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flak monkey
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| posted on 19/1/10 at 08:37 AM |
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I have done the same thing for my megasquirt controlled fan.
The ECU switches the relay to ground to complete the circuit. I just split the switched ground wire and ran it to a switch on the dash. Connected the
other side of the switch to ground and heypresto.
Switch will override ecu and allow fan to be switch on manually in traffic etc.
Sera
http://www.motosera.com
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