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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 12-27-2008
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Underdrive pulleys

I have searched and most of the posts i found were UD pulleys on the 3.0. Are they any good on a 4.0? If i buy them from this guy i will only be paying 220 for the set w/ belt...brand new. Should i get them? I guess i am expecting some low end torque for wheelin. I was interested in them because they claim to have power over the entire power band.
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Old 12-27-2008
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I'm going to tell you what I know. For the 3.0 they are pretty good, i mean 80 bucks for 8RWHP and 11ft/lbsRWTQ plus an extra MPG. But most people have said when they are one you can't feel it on the butt dyno, so I doubt that'll get you out of a sticky situation. I haven't heard much about the ones for the 4.0, mainly because they cost over 200 bucks. If I remember one post on RPS said like 3HP? But I don't own a 4.0... So I'm just telling you what you know.
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Old 12-27-2008
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heres a good thread on them for a 4.0

https://www.ranger-forums.com/forum2...ad.php?t=34153
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Old 12-27-2008
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well there you go i stand corrected, 12HP is a pretty decent gain.
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Old 12-27-2008
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you're not wrong. I dyno'd and got 7-8hp, Rich on that thread used a computer device to determine 12HP, I've heard Bamachips do a dyno on a 4.0 stang and got about 4hp. The numbers are all over the place with the 4.0 pulley.
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Old 12-27-2008
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Check out this thread..........Rich admits to problems (engine cooling and AC performance) with e-fan / UDP setup (post #7):

https://www.ranger-forums.com/forum2...ad.php?t=75566
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Old 12-29-2008
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Well, what Bob failed to mention was the circumstances under which they occured. Read the posts and you'll see what they were and what comments I've made. If the low risk is acceptible? Well, thats up to you.

I've run UD pullies on three different cars now. and having put a little over 30k on them with the ranger, for a 4.0L it's a very solid bang for the buck. Low rpm tip in throttle response is noticable as is power while accelerating.
Shoot... I pulled a 3500lb boat 1200 miles through the mountians, had the bed loaded down, 4 adults on board, and it was fine except for the emergency stop at the top of the mountian. And even then it took a few minutes to get too hot. Read my posts and you'll see what that extreme experience was all about.

Oh and btw.. my power figures are considered to be "at the crank". They are as measured / calulated by the trucks PCM. Not measured at the rear tires on a chassie dyno. Rule of thumb there is 20%. Meaning 12hp at the crank would measure 9.6 at the rear tires. And also something else to consider.. I removed the stock fan at the same time I did the pulley swap. How much power was gained from each I don't know. I *suspect* the bulk of it came from the pulley.
It was cold out side and the stock fan freewheels for the most part under those conditions.

Here is my web page

Rich

Last edited by wydopnthrtl; 12-29-2008 at 10:37 AM.
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Old 12-29-2008
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Quote:
Originally Posted by wydopnthrtl View Post
Oh and btw.. my power figures are considered to be "at the crank". They are as measured / calulated by the trucks PCM.
Here is my web page

Rich
Do you mean this technique in a thread started by you, and Trent measured >200HP with his 3.0L????

https://www.ranger-forums.com/forum2...ad.php?t=56636
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