On the sensor... I use a Spal fan controller..running off of the stock LS1 sending unit. I could have actually used the fan outputs (there are 2) from the PCM, but the Spal unit just makes adjusting temps much easier, and it also varies the speed of the primary fan versus just on or off.
On the louvers..I had thought of cutting holes and trying to make some rubber flaps as alot of the factory ones use (over here at least), but gave this way a try and it seems to work the part perfectly...
Which goes to the fan selection as well.. I thought of the single route as well...but these give more clearance around the front of the engine, and they do move more than enough air for my situation at least. In the middle of the summer I let the car idle for about 45 minutes and it would just sit right where it should temp wise, and did the same test with the air con running and idling and same thing..not even a hint of an over heating problem.
I tried to design the cooling system as overkill....I wanted to be able to sit in the bumper to bumper traffic we have here around SoCal in the hot summer time and not have to be watching the temp gauge the entire time (and have the air con blowing cold as well) I looked at what the factory LS1 cars use and just went above and beyond that pretty much (to help keep up to future engine mods as well)
Between the fans, the shroud style, fan controller, the engine itself and the dual pass Afco radiator I am real happy with how the entire combo has worked out.
Edited by LS1 Hatch, 21 February 2011 - 06:27 AM.