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Old 08-20-2010, 11:33 PM   #1
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CFM Underdrive Pulley Kit

Anybody ever install the CFM 2 pc. aluminum underdrive pulley kit on their svtf? I was just checkin it out on CFM's website and it says it will gain 3-5whp... Just wanna know if it is worth buying.


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Old 08-21-2010, 07:06 AM   #2
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Nope it sure isnt. Spend money elsewhere.
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Old 08-21-2010, 08:00 AM   #3
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I agree.
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Old 08-21-2010, 11:59 AM   #4
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being no two engines are built exactly alike, they each react slightly different to mods.
I've never seen a dyno showing much of a gain, if any from these. altho some will say they felt a difference (aren't minds playing tricks on people wonderful?).
for the cost, install time, etc. they aren't worth it for what little, if any, improvement you get.
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Old 08-22-2010, 11:57 AM   #5
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There is lots of info on this site about the pro's and con's of a underdrive pully kit. The majority seems to be against it. Do a little research and then make your own decision.

Last edited by northof60; 08-22-2010 at 05:35 PM. Reason: spelling
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Old 08-22-2010, 12:30 PM   #6
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A lot of people say that these will damage your engine but this is not true.

No one has come forward and said that there engine has been screwed up by underdrive pulleys.

If these products are so dangerous why do CFM, Massive speed and FSwerks (focus sport) all sell them.

A lot of companies that sell underdrive pulleys all claim they make a little more power but I don't think they do but that's just my opinion.
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Old 08-25-2010, 01:29 AM   #7
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I have a 04 svt, had them install about three months ago. There is a small amount of HP gain. Like you said 3,5 hp.
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Old 08-25-2010, 07:08 PM   #8
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i wouldn't really call it horsepower gain. more like increased throttle response, easier rev matching, less bog when a/c is on... so if those are what your looking for its up to you...
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Old 08-25-2010, 07:33 PM   #9
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Isn't the main benefit from the lightweight pulleys to reduce the parasitic drag caused by the heavier pulleys and thus increasing overall response?

I doubt a power increase at all, but it will definately allow the engine to function a hell of a lot more efficiently. Plus, it's cosmetically pleasing to look at aftermarket pulleys. :D
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Old 08-27-2010, 06:25 PM   #10
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These are the same as the ones for the Zetec.
I have a 2 piece set from Massive and both pulleys together weigh only a small FRACTION of what either of the stock pulleys weigh.

Mathematically, there is a pretty good difference here, but with our motors, it just doesn't make much of a difference. Our Water pumps spin pretty freely, Our alternators don't have that huge of a load to carry. Slowing them down won't do much and the weight of the pulleys is insignificant to the crank they're attached to.
Were there any real gains. Hard to say. If anything, It's a bit smoother with the AC on...
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