LS1 fan ?

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Oct 9, 2012 | 08:37 PM

dmracing

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LS1 fan ?

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

Oct 9, 2012 | 08:56 PM

soundengineer

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From: Chicago IL

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

Oct 9, 2012 | 09:00 PM

dmracing

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

Oct 9, 2012 | 09:01 PM

soundengineer

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Quote:

Originally Posted by dmracing

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

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

Oct 9, 2012 | 09:02 PM

74modified

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From: Mobile, Alabama

This is what I use for Taurus/Volvo fans

Oct 9, 2012 | 09:07 PM

dmracing

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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

Oct 9, 2012 | 09:09 PM

soundengineer

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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.