Im not sure on the CFM rating but I thing its like 5,000 or some on high. Try this link for DCC and read about it. Mustang community loves this controller and as soon as the word starts spreading to the F150 guys you will be using it. Mark VIII fan $40 bucks, Controller $110.00 plus LED indicator

http://www.dccontrol.com/0820.htm

 

I dont understand why this is wanted.... If the fan comes one slowly it takes longer to cool the engine and makes the fan run longer... In the end making it last just as long as a fan the comes on full blast and cools fast. EIther way im sure they cool as efficiant. And i would bet the same fan on the the two differnt setups would last just as long.

 

My fan does'nt come on till it hits about the 202* mark, and then it just starts off really slow, just enough to maintain temp @ at about 202 degrees. And since the control also comes with a wire to hook up to your A/C clutch when you turn on the a/c fan will work at 50% capacity.

 

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The 50% thing for the AC i understand. But if it just sits there at 202 then it could be there all day working at that temp. WEre it could cool to 190 and turn off!

 

the idea behind the dc controller and the spal that works the same way is that you dont have spikes and drops in temp as the fan turns on and off. typically, the fan turns on when the truck hits temp and runs at full power. this causes a huge amperage draw spike as well as a sudden drop in engine temp. then the fan shuts off. then the motor starts to heat up and the cycle begins all over again. with the dc controller, the fan runs at half power almost all the time keeping the engine temp constant with no spike or drop in engine temp or amperage draw. look at it this way, does the stock mechanical fan stop spinning entirely ever? or does it start spinning full force when the motor gets up to temp? no, it just spins at a constant speed depending on engine rpm

 

I agree with that... But to say they last longer becuase of it is false!

Its too bad that the spal only controls one fan that way. It has an option for a second fan but it is an on/off option only.

 

I was just crusin on ebay and i saw this!!!

http://cgi.ebay.com/ebaymotors/Linco...spagenameZWDVW

Its a Mark VIII Fan and controller... The 19inch one for whoever was looking.

 

you must have given the wrong link cause the link you provided the fan is a mark VII and 18"

 

and the way the fan's life is increased is that it runs at half speed for the same amount of time that it would if it ran at full speed. keep in mind that if you turn our radiator fan on at full blast its pulling more air through the radiator then is needed to cool it. the dc controller will still shut the fan off when not needed but when it does turn on because the motor needs to cool down its not running at full power. your thoughts are correct if the fan you are using is too small or perfectly matched for the motor. if your fan is bigger then needed then the dc controller will extend the life of the fan by not letting it over work

 

The shroud is around 19inch, but the fan is 18 which is the lincoln fan. By the way the same fan is on some of the 90s thunderbirds. On one of the mustang sites a guy had the fan tested by the fire department and it did indeed pull over 4000cfm. That is a lot of air. On the mustang site a guy there is pushing 650 hp and the fan keeps his car cool to 180 even in 109degree desert temp.

 

oh, nice

 

How did you mount your fan? Did you just mount the fan assembly to the radiator or did you modify the shroud? I am looking at making a shroud that covers the entire radiator.

 

Twintips- luckythirteen13 explains it perfectly IMO. Less amps , less draw and keeping temps constant would be efficient in more ways then one.

You don't want to run it @ max if it doesn't have to. Or power on and off all the time. You want it right in the middle for smooth operation and longevity..

 

That is true, keeping the temp constant provides less wear and tear on the radiator, head gaskets, and engine components, while providing optimum temp for fuel injection, emissions, and fuel economy.

 

I deffintly agree with this. And it doesn't matter if the fan last the same amount of time or not i would agree that this style of controller is better. You guys have converted me and im going to be looking into one of these soon.