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Will be going with the GM alternator conversion, it’s the only way. Besides increasing airflow, it’s more about AC cool down times in Miami after the car has been cooking in the sun. The only reason manufacturers build in an over capacity into their AC systems is for rapid cool down times. The 928’s AC is decent, but cool down times have never been good. Anything to increase the capacity beyond what is ‘needed’ will benefit cooling speeds greatly
So I contacted Ford AU about the big 17.5" single fan and the specs on them are they only pull 30-35 amps on startup and run back to 13-15 amps. Happy days.
found another excellent OEM E-fan on saturday...from the otherwise-terrible PT Cruiser.
Single giant blade with a nice basic shroud about 17.5x20.5" and some mounting brackets sticking out so you can make it fit your 928 rad.
Good thing about those fans Spencer is they are dual speed. Simply fit the dual circuit radiator temp switch connect to a Volvo fan relay and hey presto. I cut the fan out of the shroud using a Dremel and then bolted it to the original shroud.
Just to add some pics for Stan. Sorry mate, I forgot all about until I was under the car the other day. Hopefully it's pretty self explanatory.
I was driving in the city Thursday and it was 36C and fairly humid. Fan was only running on low and the temp gauge never went over the highest white bar. In fact it was running just below the white bar. When I parked back home and turned the car off, the fan started to run on low and then switched to high. I've wired it to keep on running after shutdown if the temps call for it. It was pretty cool to hear the fan come on after shutdown then go off, then come back on again as the coolant in the engine heated the radiator coolant again.
Forgot to add that all the heavy electrical cable is household cable. I used 40A electrical cable for the hot post cable and 30A cable to the fan.
Looking good! I have mine set to stay just below top white mark. When I get home and park I leave ign on accessory until the fans have finally shutdown.
jp 83 Euro S AT 57k
Some fan controllers (such as the dakota digitial one I have in my durango) let you configure how long you want the fans to be able to run for after you turn off the key. It has inputs to turn on the fan with the ac as well. I think some of the newer models can even take in a speed signal to turn off the fan at highway speeds when enough air is passing through the rad.
I have a 1986.5 928. I have a Hans shroud, two 12” spaul fans, and a Dakota controller. I want to place the Dakota controller in the car close to the fuse panel and connect it so that I have power when the car is shut off and another power connection for when the car is running. I was planning to connect the fans to the jump post. My first question is the jump post the best place to draw power for the fans or is there a better place to power the fans? Where on the fuse panel is the best place to drawl power for the Dakota controller? Is there a sensor in the cooling system that I can use to tell my Dakota controller when to turn the fans off and on?
I have a 1986.5 928. I have a Hans shroud, two 12” spaul fans, and a Dakota controller. I want to place the Dakota controller in the car close to the fuse panel and connect it so that I have power when the car is shut off and another power connection for when the car is running. I was planning to connect the fans to the jump post. My first question is the jump post the best place to draw power for the fans or is there a better place to power the fans? Where on the fuse panel is the best place to drawl power for the Dakota controller? Is there a sensor in the cooling system that I can use to tell my Dakota controller when to turn the fans off and on?
If you go on Dakota digitals site they list what sensors it will work with and some calbration options. I just added a sensor in the upper rad hose in my Durango.
07-23-2018, 09:17 PM
