Mods for milage ?
Thread Starter
|
Freshman User
Joined: Dec 2007
Posts: 36
Likes: 0
Got started installing the U/D Pullies Sunday evening, nowhere in the instructions did it say you need a special tool set to remove the Mechanical fan! I put it all back together and am going to wait for the Electric Fan's to get here and install it all at once next weekend hopefully !
Sick 'n Tired
Joined: May 2006
Posts: 2,969
Likes: 47
From: League City, TX
U/D pulleys decrease the alternator output and eFans require more from the electrical system and therefore the alternator. Your cooling ability could be compromised and/or you could fry the alternator. Even more so if you're running an aftermarket stereo with external amp.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
I've always thought the alt provided current based on RPM. and the lower the RPM, the lower current provided.
Those U/D pulleys scare me off. I've also heard of people bumping the idle RPM up 100 rpm to offset the slower alt speed after U/D pulley install
anybody? I like the thought of e-fans to free up a few ponies and quicker revs
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 151
From: SE Georgia
the Troyer U/D pulleys are sold as a kit and there is no mention about bumping idle up on his website.
curious about all the fuss I've heard I got to looking. I e-mailed Troyer about this and was told that no PCM adjustment was required. then I did some researching in past threads and Troyer himself said in an old thread that idle adjustments will be required to ensure good Alt performance.
what gives? I'm still inclined to believe these body styles are like the old trucks. A PCM controlled alt would just cost more $$$ to use...especially when a time tested system already exists for fairly cheap. and it's weird that I find the issue split about in 1/2 about idle speed adjustment needed with U/D pulleys
oh yeah, words of caution. Do not use the e-fan setups that have you zip tie the fan to your radiator. I've seen too many horror story threads about this. The zip ties pull through the radiator fins and ruin the radiator. You'll need to custom mount the e-fan body to prevent damage
curious about all the fuss I've heard I got to looking. I e-mailed Troyer about this and was told that no PCM adjustment was required. then I did some researching in past threads and Troyer himself said in an old thread that idle adjustments will be required to ensure good Alt performance.
what gives? I'm still inclined to believe these body styles are like the old trucks. A PCM controlled alt would just cost more $$$ to use...especially when a time tested system already exists for fairly cheap. and it's weird that I find the issue split about in 1/2 about idle speed adjustment needed with U/D pulleys
oh yeah, words of caution. Do not use the e-fan setups that have you zip tie the fan to your radiator. I've seen too many horror story threads about this. The zip ties pull through the radiator fins and ruin the radiator. You'll need to custom mount the e-fan body to prevent damage
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Post Fiend
Joined: Jan 1997
Posts: 23,165
Likes: 18
From: Enjoying the real world.
Alternator output isn't purely based on RPM. An alternator spinning at 1000 RPM can be pulling very little load if nothing is turned on and the system isn't charging. Turn things on and it starts putting a load on the system load. The lower the RPM the less able the alternator is to pull the needed load.
Senior User
Joined: Jun 2006
Posts: 248
Likes: 0
From: IOWA
I had 87 Mustang GT and it had set u/d pulleys on it and very time the motor would idle the lights would dim down and volt gauge would go down. Alt. amps output will increase when the engine rpm's go up. Check with volt machine and one with amps on it and watch what happens. I installed throttle spacer on my 05 F-150 CC 5.4L engine and increased the mpg's about 1 to 1.5 mpg's better. Was getting 13 to 13.5 to 14 to 14.5 mpg's city and highway driving and keeping rpm's under 2000rpm's. it's called HELIX made buy Street and Performance Electronices. Google and check it out. I bought it on Amazon.com.
