Update : All installed and after much creative language directed at the computer fan controller, I finally have this setup all going. So far just a few short road tests, but results are astounding. I've heard all the folks who have done previous efan installations mention that they couldn't hear the things, so I rigged an indicator light to show when they are on... totally redundant with those fans when they kick on in high , the friggen things sound like theyre about to take off ( with the nasty side effect that I'm going to have to add some more floor insulation along the firewall area as those suckers kick an insane amount of heat up against the floorboard, and I'm feeling that through the 1' of Armaflex and the layer of double backed reflective foam insulation that I already put in there
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I sealed the shroud to the rad so it would get full draw I found some nifty special high temp silicone at the HVAC supply with a-85to+ 400 deg working range ( I figured the 1300 deg stuff was a bit overkill) and it even comes in aluminum colour to match the rad
I didn't connect the controller to my AC since I have other fans for that and It's a good thing, If you have it hooked into the AC line, , it kicks the fans on full tilt the whole time the AC is on, and I tried that and it had the engine temp down to below 160 ( it was 116 deg out with the full calculated heat index that day )
Instead I've got my old standby pushers for teh AC duty that will be taking care of that and thes esuckers won't be coming on until it starts to REALLY get warm. I've got it programmed to where the the thigs start rolling on to low speed around 110 and will run at variable speeds until it hits 230 where it will kick in to high speed . High speed rolls off somewhere around 218 and it kicks into the high end of low range and will start tapering off from there and it starts acting like a thermostat and tries to keep it around 210 unless the ram air takes it below that ( which it most likely will in most cases) I have the manual override switch to kick the fans on to high at the bottom of steep hills when towing heavy to keep it from ever building up any heat to begin with so it doesn't have to thrown any off.
The flapps seem to be working just as planned When the fans are on, I took a screwdriver and went to pull them up and they were sucked down tight. I even turned on my pusher fans to simulate some mild ram air effect so it's going to take a healthy road speed to push them open at low speed where I need the fans to do the pulling, they will stay shut
the gauge signal sender goodie didn't want to play nice with the sender wire on my Isspro gauge and I ended up having to use the sender wire from the factory gauge which isn't giving the most accurate on/off times, so I'm going to have to blow another $45 for one of the Spal senders so I can get it a tad more spot on. I spent a whole day out in the heat chasing down the problem trying to figure out why the fans wouldn't shut off before I figure out it didn't like my gauge
I can definitely tell there is a reduced load on the engine. Even though teh old fan clutch was toast, just the fan whipping around in there was causing drag. I can't wait to get a nice heavy load on this thing and see how it does