240
Thanks.
Any chance if a link to the new thermoswitch you bought? I'm having trouble finding one.
jamesinc
240;70763 wroteThanks.
Any chance if a link to the new thermoswitch you bought? I'm having trouble finding one.
I bought from eBay
http://pages.ebay.com/motors/link/?nav=item.view&id=231534349103&alt=web
240
Thanks!!
Just need to find a 740 Turbo fan shroud now.
240
How much current does the fan draw? Will 15A wire be OK to use or should I buy some 20 or 30 amp stuff?
The other thing is that a lot of wiring diagrams I've seen call for a connection to the battery. I've never done this before, how is it done? Seems a bit dodgy just connecting a wire straight to the terminal. Forgive my ignorance please!
DCW242
240;71205 wroteHow much current does the fan draw? Will 15A wire be OK to use or should I buy some 20 or 30 amp stuff?
The other thing is that a lot of wiring diagrams I've seen call for a connection to the battery. I've never done this before, how is it done? Seems a bit dodgy just connecting a wire straight to the terminal. Forgive my ignorance please!
I haven't actually tested that, I used a 30A fuse and wires on mine. I would say 15A is probably too low.
jamesinc
The wire I'm using is rated for 17A and doesn't get warm or anything, but I dunno assume 20A.
240
Planning to do this conversion in the next couple of weeks
@jamesinc maybe I missed it, but with speed did you use on the 850 fan, low or high?
jamesinc
@240 I used high speed. I found on low the temps were creeping up quite a bit before the fan got a handle on things. You'll reduce load on the circuit if you spool up low speed first (like, 2 seconds ahead of high). A relay could do it, or you could just relay low speed to ignition.
Also I ran power directly from the battery post. I was running it from the power rail initially, but it was causing large voltage drops everywhere when I did that.
deleted_user_160
Some of the relays will utilise the 3 wires to control the speed, two trigger speed wires for essentially what is a soft start for the fan.
In saying that it's not a huge concern, lots of us and thousands of others are using single full speed e fans successfully every day.
240
Sounds like high speed only is the best way to go then once effectiveness and ease of installation are weighed up.
(Or is the initial load reduction on the circuit necessary to avoid blowing fuses?)
James you didn't use the 850's fan relay, just a generic one?
jamesinc
I used the relays from the 850 also. Nice to have nice plugs on everything.
240
How hard would it be for you to male a diagram of how you wired it, or at least describe it? I have almost exactly the same parts as you (thermoswitch, relays, thermostat etc) so it'd make sense for me to wire it the same, if it's been working for you.
(I'm sure I could work it out but it'd be handy for future reference at any rate.)
deleted_user_160
The theory is low speed start (soft start) is to lower the initial load on the circuit.
However it's not a major issue.
Personally I run (I think I've mentioned it here pages ago)
Davies craig dual thematic Efan controller.
One pull one push. Pull turns on, push turns on 10seconds later. Both at full speed, as intended by the unit.
Each fan has a 30a fuse, and then a 40a fuse from the power source. No melting or blowing after 3+years of use.
I've now got the same unit ready to install on my 142, although I'll only run a single pull fan on this.
jamesinc
So you should have a big fat plug that supplies your +12V into the relay pack, a big fat plug with two wires going to the fan, a third black wire from the cam (ground), and then a plug with two small (yellow? wires).
With those small wires, one of them will trigger low speed if you ground it, and the other will trigger high speed. Run which ever you prefer to one pin of the thermoswitch, and run the other thermoswitch pin to the chassis.
Run the fat +12V wire to the battery along with the fat ground wire. If you don't want the fan to keep running when you kill the engine, you can find a 30A relay and relay the fat +12V onto the blue coil exciter wire.
240
So you used a generic 30A relay as well as the 850 relay pack? Just to stop the fan running when you switch the engine off, or is that a third relay?
Ghettobird
Im running the 850 fan High speed only through a Davies Craig digital fan controler, all it does is eat 30A fuses every time she goes to power on
Ideas?
Startup amp draw must be huge
deleted_user_160
Dead/dying fan.
Other than free, I don't understand why e everyone is fixated with using old electric fans for such a critical fit out.
jamesinc
@240 I used a generic relay only to disable the fan circuit when the car is off. If you don't mind the fan running for 30 seconds after you switch the car off, you can leave it out. On Nina's 244 I found it would switch off and then come on a second time for a few seconds, presumably from the sensor being heat soaked, and it was really annoying, so I added that relay onto the coil +12V feed so that the fans can only operate with ignition on.
deleted_user_160
James that's from thermal dynamics moving the coolant around the system. I've seen heat soaked hot rods run for many might items after.
Ghettobird
Its ok, Im a retard and was feeding it through the high and low soeed circuit...
