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I have both of my 740's with electric fans and sensors,on a non-turbo 4 cylinder you need at least 1600 cfm to cool down your system with average driving.I have an Imperial unit(Hayden)on the 740 non turbo(b234f)it is rated at 1800 cfm and draws 13.4 amps up against the radiator(an accurate rating)I mounted right up to the 4 holes on the blackstone radiator rails on the bottom and top,I used metal brackets so the fan is like a factory mount so I wouldn't tear up the fins with the"thru core"type of mounting.I tested this system in 95 degree days up hill a/c on and the temp never went above the 12:30 position.As far as the alternator draw,if you car has at least an 80 amp alternator it will keep the battery at 13.4 volts at idle with a/c,lights and brake pedal pressed,so 14amps is the max with that alternator.Pema-cool sells a fan that is rated at ten amps and moves an estimated 2950 cfm,this rating is not against the radiator but still looks good,I have been wanting to try one,it has large curved blades so it should be fairly quiet because of the large curved blade design,straight blade fans are louder but intended for limited space to move the same cfm as a large quiet curved blade fan,I used one of these on the turbo due to fact of having only "4 inches between the core and waterpump shaft.You want to find a low amp,high cfm,quiet fan that is a low profile type if possible.If you have the factory mounted temp sensor in the radiator you can use it to trigger a fan relay controll unit offered by Imperial(hayden)I use the adjustable sensor type so it turns on the fan with the a/c and the temp probe works as a backup in case the stock sensor fails or if the car doesn't have one.Hope this helps.
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