Forgive the rookie question, but can I add and efan to my supercharged 05 SCREW?

 

im pretty sure you can.... in fact FTE Ken has that set up i do believe.

 

Does the Troyer setup use the pins through the rad mounting?

Mike

 

No, there is a very nifty bracket system used that actually looks factory.

CMOS

 

Bob,
Are the 16-inch fans that you sell made by Troyer or are they a different brand?

I really liked the troyer kit that FTE reviewed.

-Champ

 

If they would extend the sale, maybe I could afford them, having a sale like that right after Christmas with all the bills really SUCKS !

 

I'm not sure what brand of fan Troyer uses, so I dont know.

As as far as the supercharged stuff goes, our older dual 14" fan kit was installed locally on a roush blown truck with great results!

 

So Bob, in your testing of your E-Fan kit, be truthful now, what gains in power and milage did you really find on 5.4 engines ?

 

for anyone who has installed this troyer fan kit ...how hard or easy is the wireing...not a very big fan of cuting in the factory setup

 

I'm tempted to try an e-fan myself, but I'm not convinced an e-fan will gain anyone more mpg or power, so-to-speak.

I can imagine one benefiting from an e-fan during acceleration because of 30lbs less rotating mass for the same reason people get lighter flywheels, and/or when we don't need more airflow when the stock fan would otherwise be spinning the whole time.

However, if there's no factory fan loading the engine mechanically, the e-fans will load the engine electrically when they do spin. So benefits will depend on driving conditions also. No such thing as a free lunch! Don't know what the fan spec is, but if each fan pulls 10amps, that's about 120W each or about 1/6~1/5HP less going to the wheels not including alternator losses. Not sure how much the stock mechanical fan would cost in terms of engine load... any of you mechanical engineers out there?

I'd be curious to see a dyno of before-and-after with the factory fan, the e-fans running, and the e-fans not running. If there are noticable gains in mpg and 'power' where I normally run the engine (like at 2Krpm) it might be convincing, but if the claims of HP/torque/mpg are measured way up at redline (as an exaggeration), I doubt there's any real benefit for the average driver.

Considering I get about 15mpg in the city and 18mpg on the freeway whether I'm fully loaded or completely empty in my FX4 screw, I'm doubtful an e-fan can return 1~2mpg which really means a 10% increase...that sounds aggressive.

A big advantage I can think of having an e-fan is it should compensate for our weak A/C's by pulling more air through the condenser in idle traffic!!

 

Here's some reading that basically answers and confirms my suspicions--
They're saying a regular mechanical fan consumes around 2HP maximum off the engine if that much airflow is required, but it runs much less than that if not. Not sure where or how that translates to 15HP gain at the wheels, even if it was half the airflow of what our trucks need.

Read the full text at:
http://howto.globalvicinity.com/gv_wiki.php?wi=149&co=1&vi=1
It's quite informative and appears unbiased...


Electric Fan vs Stock Clutch Fan Summarized

<hr> The electric fan and clutch fan both have their pros and cons. The electric fan will be over kill for most engines at idle or low speed crusing. An electric fan that pulls 15A will consume about .40 hp with a 50% efficient alternator so while the electric fan is powered, it will also require more mechanical power from the engine then the clutch fan during normal driving conditions. When the electric fan is off, you have zero power loss and only gained any amount of power that could have been taken by either the e-fan or clutch fan.

...

The amount of HP or HEAT the engine creates at the times the clutch fan needs to be used is very small so you should not need MORE CFM then what the stock clutch fan is capable of.

...

The electric fan is capable of more cfm for less mechanical power. The stock clutch fan would require about 2hp to move 2500 CFM of air. An electric fan will only require about .30-.50 hp to move the same if not more air.

...

Other then that, you are only cleaning up the engine bay which could be very important

 

Its very easy. You only need to connect to one existing wiring, the rest go to ground, positive, etc.

 

Your raise some good points. But like you also mentioned, moving more air for the A/C is a good thing and can improve performance of the A/C. Another thing that attracts me to Troyers fans is the mounting hardware, the capability of having them on all the time (for when I S/C and need to bring intake temps down while sitting in traffic or at the track), and the capability to custom set them. So I think you would agree there will be some benefits to the gas mileage/hp gains from using e-fans, maybe not what they are advertising, but still, a plus. Also, like you mentioned the cleaning up of the engine bay will be very beneficial, especially when changing the oil. Another plus for us guys thinking of S/C is you don't have to cut the fan shroud, and if you are like me, I like the option of going back to stock and not messing up stock pieces. Of course these are all MY opinions.

 

1, The fan in an F150 is much larger and heavier than in an RX7. You can't use their numbers.
2. Dual fans means you're not using full power to cool except when you need it.

What qualifies his opinion?

 

Something I don't think was mentioned, for the supercharger guys like me, is you can manually turn the fans on to get intercooler temps down. It can make a huge different in boosted power.