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Unread 12-11-2005, 08:35 PM   #1
loudog3114
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Electric Fan Conversion and HP Gains...

Has anyone converted to an electric fan and gained noticable horse power? Also, when you did the conversion, how did you then route the belt if it was an I6?

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Unread 12-11-2005, 08:40 PM   #2
Jerry Bransford
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It won't be noticeable since the alternator then has to work harder to produce the electricity that the new electric fan draws... and the more drain on an alternator, the harder it is to turn. In other words, there is no free lunch where energy production is concerned.
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Unread 12-11-2005, 11:04 PM   #3
Stu Olson
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Quote:
Originally Posted by loudog3114
Also, when you did the conversion, how did you then route the belt if it was an I6?
Couldn't you just put the nuts back on the pulley and run it like that? Here is a photo of a '99 TJ with the fan removed. I've not tried it myself but it seems likely it would work.


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Unread 12-11-2005, 11:21 PM   #4
FifteenCents
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I agree that the reason is not to gain horsepower. horsepower is not what jeepers are conserned about...TORQUE is the key, and an electirc fan will not help there. BUT it will help in deep water as you can turn it off so it won't munch your radiator with the water causes the fan to pull forward and chew up your radiator.

The pulley is held on by four studs that are run into the water pump and the fan is held on to them by nuts...just back out the studs and put in shorter bolts in their place....

SO...to recap..if you do not have a snorkel don't waste your time or money on an electric fan you will have to upgrade your electrical system.
New Bigger Alternator $$$$
Electric Fan $$$$$$
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Unread 12-12-2005, 03:00 PM   #5
jbrnigan
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Jerry's response is accurate as far as it goes. Yes it will take additional horses to turn the alternator when the electric fan is running, but you will achieve a noticeable gain when the fan is static, which should be most of the time that the Jeep is moving - street time. Slow off road and stop and go will cost you horses. Many electric fans can be pre set to turn on from between 180 and 200 coolant degrees measured at either at the upper radiator hose or via a probe in the readitor near the upper hose connection. They can also be manually cycled.
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Unread 12-12-2005, 03:14 PM   #6
o2tj
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lol! you guys need to try a ford two speed and tell me you have no gain in power. also you have no rotating mass....have you guys felt how heavy a fan and clutch are. you will also have longer w/p life. my fan stays off most of the time even in the summer it only comes on for about 3-4 min wile sitting in traffic. off road it cycles but most of the time Im in low anyway and the rpm are up. You should have a mean green alt anyway if you plan on a winch w/ lights and stero....you cant tell me you dont have that stuff .................................................. .....OH! just to let you know my fan on high only draws 21 amps and low is a low 9 amps wich I use on the street.
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Unread 12-12-2005, 03:23 PM   #7
TenaciousTJ
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Are you running the Taurus, spelling is probably all messed up, dual fans? If so, pics would be excellent and much appreciated. Do you think they would work in an '05?
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Unread 12-12-2005, 03:43 PM   #8
jeeptj19992001
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the belt would stay the same, you still need your water pump...or am i missing something?
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Unread 12-12-2005, 03:59 PM   #9
o2tj
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Ill take som pics tomorrow and post them........as long as its not iceing tomorrow. an 05 ......Oh yeah! easy
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Unread 12-12-2005, 05:22 PM   #10
Hunter9
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Quote:
Originally Posted by jeeptj19992001
the belt would stay the same, you still need your water pump...or am i missing something?
A water pump by itself does not take much energy to run, but o2tj is right the rotating mass is there, like the difference between a axle turning with and w/o a wheel and tire attached.
On the other hand Jerry is correct the amount of usable HP and/or torque is in such a small amount it is probably not worth the extra $$$ to do it, unless you are trying to gain the ability to turn off the fan.
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Unread 12-12-2005, 05:41 PM   #11
loudog3114
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Quote:
Originally Posted by o2tj
Ill take som pics tomorrow and post them........as long as its not iceing tomorrow. an 05 ......Oh yeah! easy
are you guys referring to using a ford taurus electric fan? if so is there a write up somewhere?
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Unread 12-12-2005, 05:45 PM   #12
Steve B
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Quote:
Originally Posted by Hunter9
A water pump by itself does not take much energy to run, but o2tj is right the rotating mass is there, like the difference between a axle turning with and w/o a wheel and tire attached.
On the other hand Jerry is correct the amount of usable HP and/or torque is in such a small amount it is probably not worth the extra $$$ to do it, unless you are trying to gain the ability to turn off the fan.
A water pump does take a lot of energy to run, I work for a reputable engine tuner in the uk and on a 2.0litre 4cylinder petrol making the water pump pulley larger and slowing the pump down gained 15bhp......
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Unread 12-12-2005, 06:03 PM   #13
Tj4rocks
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I have converted mine to electric fan about 3 years ago. As far as the water pump, i just took off the fan and put the nuts back on. As far as a power increase, i could tell a difference cruising down the highway because the electric isn't pushing around air it doesn't need to. I am happy overall that i did this mod to the jeep. I'm using the flex-a-lite black magic fan. I haven't noticed any problems with the charging system and don't see any reason for a bigger alternator. Just my 2 cents.
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Unread 12-12-2005, 07:31 PM   #14
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I'm also running a Flex-a-lite Electric. I didn't notice any huge HP/torque/ whatever gains. I did notice that you can dial in the cooling, IE warmer in winter, cooler in summer if that's a biggie for you. I also noticed this thing is LOUD. Kinda weird I wired mine direct (no I haven't had any problems with it running the battery down) and it'll cycle on and off a couple of times after the jeep's been turned off. I did have my Jeep start running hot on a trailride this summer, but we were pounding on them pretty hard and there were jeeps with mechanical fans that were also running hot on the same runs. In retrospect I could have spent the money elsewhere..... my.02
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Unread 12-12-2005, 09:56 PM   #15
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Quote:
Originally Posted by drottie
I'm also running a Flex-a-lite Electric. I didn't notice any huge HP/torque/ whatever gains. I did notice that you can dial in the cooling, IE warmer in winter, cooler in summer if that's a biggie for you.
<SNIP>
The fan should make no difference at all since you're running up against the thermostat anyway.






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