flynhi

Does anyone know of a relay/controller device that varies the speed of electric fans as coolant temp changes rather than just turn them ON/OFF?

427V8

Looking for new ways to waste our money are we????

KorbenDallas

LOL, and I clicked here thinking "that would be cool to have". :D

flynhi

Actually, no. The dual spals pull about 30 amps which will tax my alternator, wiring and battery.
I figure a variable speed relay will reduce elect system load 95% of the time while maintaining a constant temp rather than running up and down as the fans turn on and off.

0Mike69@ECS

:lol: me too!!! :lol: :D

mrvette

Your biggest problem would be the extra energy wasted in dropping the voltage across the controll device, the heat sink required for that would be very large and need mounted elsewhere than engine compartment maybe in front of radiator....
it's just not worth it, maybe turn on one fan, then at higher temp, turn on the other is only way to go on that one...too much wasted energy otherwise...

GENE

zwede

If you feel like doing some creative wiring you can hook it up like GM does on some new cars:

At somewhat hot temps the fans run in series, then if the temp keeps going up they switch to parallel. Running them in series cuts power consumption by 75%, and amperage by 50%.

It's implemented by 3 relays.

flynhi

Markus, I might give this a try. Can you help with a wiring diagram?
Also, can you describe the brackets you made to install the Spals?
Thanks,Will

zwede

Will: I'll see if I can draw a diagram this weekend.

I didn't make the brackets, but bought them from be-cool. Very overpriced, IMO. Charged me $120 for them. I think someone posted a scan of the installation instructions a few days ago. The brackets in that diagram is what I have.

70 LS1

I wired up my fans to run off the computer for my LS-1. At a predetermined temp, they run in slow (series). Then if the temp still rises, they shift to fast (parallel). If you want, I can send you a wiring diagram. It was pretty easy to do. All you need is three relays some wire and in your case two adjustable temperature switches. I also wired up a switch so i can run them manually from inside the car.

flynhi

Zwede and LS-1,
Thanks for the offer on the wiring diagram. I'd like to take you both up on it. Maybe we can develop something cool that others can use........
Regards,
Will

robzr

I paid $80 for my Be Cool "billet" brackets (there is a reason I put quotes around billet). I'm welding up my own support with brackets included so I'll be selling mine shortly at a nice discount, tell me if you are interested. New in the box.

Rob