4000 CFM E-fan to much?
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Veteran
Joined: Jan 2010
Posts: 485
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From: hickville WI
4000 CFM E-fan to much?
I have a 2500 CFM Flex-a-lite E fan and it can't keep up 3300 CFM is what I'm suppose to have but I'm finding 4000 CFM for less cost besides pulling more amps would this be a problem?
Champion
Joined: Aug 2010
Posts: 2,697
Likes: 3
From: Cape Carteret NC
w/ towing package and electrical group, (those dang packages are tricky you know) you should have a 136a alternator..
do yourself a favor, and run them directly off the battery, fuse and relay protected..
in my opinion, you can never have too much air... draw too much amperage yes, but never too much air..
it's all in the controller imHo.. I'd do a soft start controller and control the second fan w/ full load right off the bat.. the first fan starting slow will NOT pull the 25a, instead it will pull somewhere around 10a.. even running full blast from a soft start, one fan won't pull anymore than 10a.. now when the second one kicks in- you'll pull 25a for a split second before it settles around 10~12a too.. putting full charge on both at the same time (which is how mine are set up) pulls upwards of 40~50a for a split second, but they settle under 20a for both..
i too run a 136a alternator and I haven't seen an issue.. I watch it closely..
i wasn't too sure about the efan when I put it together, but I am now.. if I have to replace the controller, it will be with one that has a single channel soft start..
and btw- i rec you run the controller of a constant hot wire as opposed to a ignition only wire.. pushing those cfm's, you should only run for a minute or so combined after you kill the engine.. that ain't hurtin a thing..
do yourself a favor, and run them directly off the battery, fuse and relay protected..
in my opinion, you can never have too much air... draw too much amperage yes, but never too much air..
it's all in the controller imHo.. I'd do a soft start controller and control the second fan w/ full load right off the bat.. the first fan starting slow will NOT pull the 25a, instead it will pull somewhere around 10a.. even running full blast from a soft start, one fan won't pull anymore than 10a.. now when the second one kicks in- you'll pull 25a for a split second before it settles around 10~12a too.. putting full charge on both at the same time (which is how mine are set up) pulls upwards of 40~50a for a split second, but they settle under 20a for both..
i too run a 136a alternator and I haven't seen an issue.. I watch it closely..
i wasn't too sure about the efan when I put it together, but I am now.. if I have to replace the controller, it will be with one that has a single channel soft start..
and btw- i rec you run the controller of a constant hot wire as opposed to a ignition only wire.. pushing those cfm's, you should only run for a minute or so combined after you kill the engine.. that ain't hurtin a thing..
Site Moderator
Joined: Jan 2008
Posts: 8,374
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From: Sioux Falls, SD
I run two 3000 CFM fans myself. The one 3300 CFM fan wouldn't cut it for me when the temp was around 100+ degrees and I turned the A/C on. She would warm up to about 200. She stabilized there, but I want her in the 180-190 range.
The newer 3rd gens you can get away with a single 3300 CFM fan because they have a separate smaller fan on the A/C condenser, which is off to the side. On our trucks, the condenser is right in front of the radiator, so they influence each other, and therefore you need more CFMs than the 3rd gens.
The newer 3rd gens you can get away with a single 3300 CFM fan because they have a separate smaller fan on the A/C condenser, which is off to the side. On our trucks, the condenser is right in front of the radiator, so they influence each other, and therefore you need more CFMs than the 3rd gens.