Massive underdrive pulley, which size belt do I need?? - Page 4 - Focus Fanatics
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Old 03-07-2014, 08:47 AM   #31
Conflicted Chaos
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Its the Massive water pump lightweight pulley for the duratec. No crank or anything just one piece.
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Old 03-18-2014, 11:12 AM   #32
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So did this ever get figured out? I bought the massive wp pulley for now and would like to have the belt before I take things apart.
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Old 03-18-2014, 11:31 AM   #33
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Its a guessing game with the belt size. I tried the next two sizes up from stock but they still weren't long enough. Hence why I'm selling it now. The only way to really get an accurate measurement is to run a string with the Massive UDP on and then measure the string.
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Old 03-18-2014, 11:34 AM   #34
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@RPMisChris Let me know if you figure out the size and if the pulley makes a difference or not. I might reconsider keeping it if it doesn't sell.
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Old 03-18-2014, 11:36 AM   #35
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ok sounds good. Perhaps I will just measure the difference between the size of the pulleys and add that on top of the stock belt size. Should be a good starting point.
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Old 03-18-2014, 11:42 AM   #36
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I found out the stock belt size is 87.5
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Old 03-18-2014, 12:52 PM   #37
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You guys know that all this time and money your spending will not even gain you 1HP right ?

Tom
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Old 03-18-2014, 01:17 PM   #38
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I got mine for practically nothing. So in my case any benefits outweigh the costs. Plus it looks awesome!
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Old 03-29-2014, 02:38 AM   #39
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I just purchased Conflicted Chaos's WP pulley and I will say it was well worth it. This is not one of those mods you do for big dyno numbers but for improved driving dynamics (IE* like a 67mm throttle body). LIke the 67mm throttlebody it helps the car feel so much more engaging and helps driveability; however the best benefit I have noticed was the car running slightly cooler on the gauge (not too cold or out of operating temps) so the reduction in cavitation as Massive promised really shows in temps (fluid cools better with less aeration). This is a major plus for me during track days.

I would not have purchased this pulley with just the opinions of just the Focus community but out of curiousity I browsed the Mazda 3 forums and there were quite a few guys who just did the WP pulley (stock crank pulley) and loved the free'er reving engine and the overall feel of the car. So I went ahead and took the chance and tried it out for myself and I am glad I did. The Massive WP is larger (but lighter) than the stock pulley and is very close to to the p/s pulley tolerance wise but everything fits and works beautifully.

As for size the belt is a 90" belt and can be had at Advance Autoparts: Dayco Poly Rib 5060900

(This is for stock crank pulley users; those running a lightweight crank pulley can use the stock belt size. I was wrong earlier about using the stock belt size whilst running a stock crank pulley)
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Old 03-29-2014, 03:00 AM   #40
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Thanks Yellow Hatch for solving the Massive mystery. Now maybe people will be more open minded about getting one.
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