M30 cooling issues

[azzkikr]

Okay I am finally having to come up with a cooling fan for my car. I got a fan from Sumit... I dont remember which one. I am going to make a shroud for it out of aluminum and also attach it with aluminum braces. I am not sure exactlly how I am going to do it yet. If anyone wants to share what they did that would be helpful. Ideas/suggestions are certainly welcome.

[Psychomofo]

I got...I believe it was a 14" Hayden pusher fan, and I just mounted it with the supplied zip ties. I honestly really did not like pushing those things through the fins of the radiator, but it doesn't really hurt them. I can't really say how well this works yet, cuz I still don't have my temp gauge working yet.

[Garageaholic]

Yeah, i'm just going to use the E30 electric fan... probably run full time, I may hook up a switch.... if i have problems then, i'll cross that bridge when i come to it...u think a shroud will help that much?

[azzkikr]

A shroud is certainly necessary. If you dont have a shroud then the air just circulates around the outside of the fins of the fan. It pushes significantlly more air. I read a study on it once but just try a fan in a shroud and then one without and you will see it makes a huge difference. Unless you are a fluid dynamics buff thats enough proof. :-) You want the shroud to be as close to the edge of the blades as possible. That is where most of the lost air occurs. It just loops right back around to the front side of the fan.

Those using the stoc E30 electric fan did you also mount in the AC radiator then? Are you using AC? Or did you just zip tie up some attachment?

[Garageaholic]

Nope,,, no AC for weight purposes.....

i rigged up some mounts out of steel and bolted it to the outside circular "edge" of the fan.. good call with the shroud. i'll have to fab one up somehow..

[bumpstop335i]

When i got mine done, no a/c for me. Thats what the window is for.

I'm still using the electric fan from the e30. All though, for all the M30's in nonf/l body then try and get yourself a f/l one. They look way more hardcore.

Anyway, there are rivots holding the a/c radiator to the assembly. Drill these out and the radiator will pop out. Now, for the DIY ESIRE grap a MIG welder and just tack the two places that need a weld and a small triangle brace or just drill and rivot them back together, so it is stronger.

Now, the fan will sit an inch off the radiator. A long piece of sheet metal is now required to fill the gap that the a/c radiator has left. Weld with the MIG and spray black to make it look neat and tidy.

My electric fan runs on two extra thermosistors that sit on each side of the thermostat. They are then wired into the fuse box, and operate the two relays for fast and slow.

OT: do any of you guys cars cool down on the open road compared to city driving. Because when im in town temp gauge sits at 1/2 and open road it cools down to 1/4. That means no hot air for me. Do i need a cooler theromstat?

[azzkikr]

bumpstop that sounds like a pretty good setup. Do you have any pictures of that? I would interested in accomplishing the same. I think I am going to try that next weekend. Did you run it on the stock circuit or did you move it to its own circuit in the fuse box? I assume it should be fine in the stock position.

[bumpstop335i]

the two thermosistors are the ones with the red spade terminals.

I have three different wires, high, low and earth.

Stock should be all you need. unless you think other wise. I just worked it out using the wiring schmatic of the a/c. It operates in an 'AND' circuit. Where as the temperature increases the resistance decreases in the circuit, therefore enaging the fan.
There is a reasonable amount of room in the fuse box. consult the bible to pull it apart.
Thats the best pic at the moment, sorry. The car is in the paint shop in another city.



TIM