LS1 fan install....somebody wanna help me out?
 

I know the FAL fans would be an easier install....but i can pick up a fan set off a 2001 T/A for $50. I know i've heard of people doing the LS1 fans but i was wondering whats all involved with it compared to the FAL fans. And are the LS1 fans keeping your engine cool? Im thinking about getting a pulley and i've also got a body lift, so the airflow from the fans wont exactly be lined up with the motor perfectly...so the radiator will have to do most of the work.

Here is a website someone made a while back... it has step by step instructions with good pictures. Good luck!

http://james.jaguar.net/agreif/fans/fanstech.htm

thanks for the link.....really helpful!

They both do the same job but the FAL is obviously a much nicer unit overall. Im sure it pull more air (if you need it) and looks super clean.

I didnt ls1 fans beacuse I didnt want to spend like 400 or whatever it is for the FAL, mine work awesome. Just take some time and do a nice install :thumb:

$50 on the fans is a pretty good deal i think...i dunno what they usually go for, my buddy has a couple set of them and he said he would let me have them at a fair price. As far as the VSC, how much does it go for? I hope this isnt the same part everybody has problems with melting wires and such.

I got mine for 75 :thumb: The VSC is the one you are hearing about. I have no problems so far, but if I was going to buy another controler it would be the DCC. I will give it up to FAL for taking care of their customer, they have always been great with me, but you might save yourself some headache with the DCC :D

So is the DCC made by FAL as well or another company? Any way i could get a p/n or price and as well who to get it from. Im all about saving headaches :)

Try fbodyjunk.com. They sent me a set for 70.00 shipped. They are in S.C. also so you will get them pretty quick.

DCC is made by another company ....

http://www.dccontrol.com/

Maybe we can get 02denali to chime in here...

dc controller is made by dc controller. it is a wonderful unit. mac has the sight there. all you will need is the 35amp unit. this unit has worked well for me with no problems at all. with this unit my fans have never went over 50%. this keeps my truck plenty cool and draws half the amps. if you have any more questions lemme know. :devil:

You just need one 35amp unit for both fans? You just splice it, and run it that way because from what I read on their site it will only have one outlet?

i put lt1 fans in my old sierra, was a snap and easy. my site isnt as detailed as the other but it will run cooler and free up a lil power

http://www.geocities.com/victoryredzr2/lt1fans.html

Are you running them off of just one 30 amp relay?

if my memory is correct yes, there was one the thermo assy. i bought, and i wired the override switch to the a/c side of the thermo assy. instaed of ac system. basically they cam on at 160ish or when i flipped the switch.

I just thought that one single 30 amp relay wouldn't be enough.

Aaron

its near the limit but worked ok :drive: i think the fans are 10-15 amps each tops,

Will the DCC controller come with wiring instructions for two fans....or do i need to just wire them in parrallel? And i think the model your referring to is the FK-35....just wanting to make sure everything is right before i buy and get started.

This sounds pretty good.....not too bad to be out a couple hours labor and have e-fans for about 170 bucks :)

Also, i dunno if this should be something i probably need to ask them. But im going to be running a ASP pulley and i noticed that they have a U/D pulley loop on the controller that makes the fans always run at 10% but it makes them run at 100% with the a/c on.......i was wondering if that would be too much draw for wiring the fans in parrallel or if just having it with the normal 50% on during a/c would be enough.

How long have you been running it like this? I was going to hook up some fans, but I didn't want to buy a $80 controller, and I can get a hayden one just like the one that you have for $25 at work. Also, how well does that probe work for you? Last question, Do you just have the wire spliced coming off of the controller for the second set of fans, or did your controller come with two outputs? If you did it a different way please let me know. Thanks

Aaron

yes the fk35 is it. i had an underdrive pulley and i left it alone.it never got hot and i have a 160 therm. if it does get warm then the fans will come on faster. it comes with the wiring -instructions-and everything needed.i simply wired my fans together behind the shroud and ran one ground and one hot to the controller. it works great. be sure not to overtighten the nuts on the terminals. they only need a little tightening.

Thanks for the info man, i was wondering though....did you buy your's direct from DCC or did you buy it from a distributer?

i bought mine directly from them.

Your fans don't need to line up with you motor. They need to line up with your radiator. Look at the Super Comp cars. They have a remote radiator with a little electric fan to push air across them. They are mounted horizontally BEHIND the engine so they get NO air flow at all as the car is moving. If you don't use a DIGITAL controller of some sort you can just use relays and an adjustable thermostat from flex-a-lite as your control. You need one relay to turn the fans on when you reach operating temp and another to turn the fans on immediately if you switch on your A/C before you engine warms up. As long as you know basic electricity (Ohms Law) you can do this stuff in your driveway. I would solder everything. Crimps are not always sound mechanically or electrically. You need a schematic to find the right trigger wires to pick your relays. The pulley is a good idea too. You get a noticeable gain from it.

Ya, i know it will cool without the fan being inline with the motor....but it does help a little with effeciency if the air off the back of the fan blows across the exterior of the motor. No biggy though, i figured it would work fine. Im probably going to wait until i get back from Savannah to tackle this, along with the pulley. I wish my local track would let me make a run in my truck.....friggin tech wont let me run on my tires :eyes: So i guess i gotta go by SOTP for any gains i get off each mod. Oh well.

Does anyone have a schematic for the 3-relay hookup of the fans that runs off of the PCM?

You need a schematic that is specific to the vehicle your working on by year and model. The PCM wire probably provides a ground so you would connect that wire to the coil of the control relay at either teminal 85 or 86. The N.C. contacts of that relay would go to the fan. You connect teminals 30 and 87a of the relay to 12VDC and ground to turn the fan on when the PCM provides the trigger. It doesn't matter which of those terminals is HOT or GND, but you do need to know if the PCM provides a GND which is most likely the case. The coil of the other relay goes to the A/C circuit. You can tap into the A/C relay coil circuit or the A/C clutch circuit to pick the relay that your using if you turn on your A/C BEFORE your engine warms up. The N.C. cntacts of this relay also go to the fans. If you have a schematic and know basic eletricity you won't have a problem making these connections. Use solder connections. Only make crimps on vehicles you will never see again.

so, something like this would work OK?

yes but the truck pcm only provides one ground. the fbodies have two. hook one up to the a/c. but it will be positive.

Sounds like a plan and you only need one extra realy to get the circuit to operate that way. Relays are cheap. Just solder everything and use plenty of wire ties to keep things neat and out of harms way. Are you using a low temp thermostat. That will bring the water temp down too.

I have a schematic of both: using the A/C clutch compressor relay ground control (previously attached) and the A/C signal request, +12V (attached here)

I just didn't know which way would be better.

3-relay

If you go back to ohms law you know that when you tap into a circuit you are creating a NEW parallel branch circuit. Ohms law says each branch sees the source voltage, but the current different depending on load. That means it doesn't make a whole lot of difference which circuit you use to trigger your fans. Just find one that is easy to get to and use shrink tubing and solder everything.