dmracing

iTrader: (78)

What did you guys do for relay amp wise for the fans. Did you use one or two?

soundengineer

iTrader: (16)

one per fan.....any standard 30/40 relay will do.

dmracing

iTrader: (78)

I was told I could use one 70 amp relay for both

soundengineer

iTrader: (16)

you need one relay per fan to turn them on separately.

74modified

This is what I use for Taurus/Volvo fans

dmracing

iTrader: (78)

Its a carb car, no computer. Im not trying to argue but, I was told to tie the two together and use 1 relay to turn both on. Im using a temp switch in the head to turn then on. I was told to run the negative from the relay to the switch in the head

soundengineer

iTrader: (16)

good diagram...
doing it like that makes it so that only one fan can be on at a time....
need power to go to 30 on both relays...and 87 to go to each fan...
the LS1 will want both fans on in high mode

stock pcm supplies a ground to enable the relay


personally, I prefer to use a 12v switched source for the relay to turn on instead of a ground to enable it...but you have to either have a separate switch, or be using a different controller for the fans.

74modified

Yep, read it fast and thought he meant one or two fans not relays. Two speed fan should have one speed at a time.

No ECM then go here http://www.davebarton.com/pdf/coolingfandiagrams.pdf Several different setups