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Thread: Underdrive Pulleys FSWerks, Massive, ?

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    Default Underdrive Pulleys FSWerks, Massive, ?

    Looking to buy a under drive pulley(s). I see I can still buy new from FSWerks and Massive. Maybe there are others? I read good things about FSWerks and Massive and prices are similar. My car is a daily driver not a drag car so just looking to add some power without giving up mpg. Any thoughts you guys have on the subject is very much appreciated. Thanks

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    Fswerks FTW! It's a great quality UDP. You'll feel the difference. Its been on the car for 2 years. Just don't make the mistake I made by cleaning it with full strength degreaser. It made the shiny red dull

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    Quote Originally Posted by treb88k View Post
    Fswerks FTW! It's a great quality UDP. You'll feel the difference. Its been on the car for 2 years. Just don't make the mistake I made by cleaning it with full strength degreaser. It made the shiny red dull
    Awesome... thanks for the feedback!

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    I found an old ZXTuner UDP on ebay. Worked fine. What didn't was the belt that they included that was too small.

    John

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    Is the powder UDP a good one to use? I got one with a wrecked Sr a while ago, but I'm not sure if I should put it in when I rebuild and swap engines.

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    powder UDP was the smallest and lightest UDP ever created for the zetec....its great. I've skipped the keyway on a zx2ner many many years ago. Ran a powder since then up until the last timing job on the turbo car where i ran into the only issue with the powder pulley; the TIMING belt will wear into the back side of the pulley itself. It takes many years(many miles?) to do so.

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    Most likely as long as I don't go over mileage between timing belt changes, I'll be fine? I really don't like the idea of losing the belt too far before the change because it'll still be a daily driver and I'd really like it to stay reliable. Also, is there a noticeable change in throttle response with a UDP? This car has an odd habit of bogging down as you let the clutch out and lurching, but that may be an issue with just my car (it has 177k on it).

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    Quote Originally Posted by bws678 View Post
    Most likely as long as I don't go over mileage between timing belt changes, I'll be fine? I really don't like the idea of losing the belt too far before the change because it'll still be a daily driver and I'd really like it to stay reliable. Also, is there a noticeable change in throttle response with a UDP? This car has an odd habit of bogging down as you let the clutch out and lurching, but that may be an issue with just my car (it has 177k on it).
    it does not work like this. even if you change your belt every 10k you can have the problem happen. Right now you dont think there is a problem because the pulley you have is steel and it does not wear as the aluminum one would

    you will find out soon enough after you install one of these
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    Okay wow now I really wanna know what the gains are. If it's as small as a header for daily driving I may just leave the UDP off. It's hard to get time to spend on my car, and if it has problems changing the belt once a year or more...yikes. It would really suck to lose a belt and have to have it towed home because I was dumb and put a used aftermarket pulley on. I'll have a lot of time to consider what parts to use, and input from this site is always appreciated.

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    Here is what FSWerks shows on their website for performance gains.
    https://cdn.shopify.com/s/files/1/01...g?v=1495815271

    My ZX2 always feels a little flat until I hit the 3,500-4,000 rpms. According to the chart... I liked the power gains at low rpm so I bought it. I've not put it on yet but will over the net week or so. You'll need a different size serpentine belt since the pulley has a different diameter. Since I have HID headlights and large stereo systems FSWerks recommended I purchase a optima battery which I did. If headlights are two dim I might have to install a different size alternator pulley to speed up the alternator some. Looking forward to testing it out. I'm also having a drawing made of the FSWerks pulley to make it out of steel if the aluminum pulley does not last.
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    You often hear arguments against the use of solid aluminum Underdrive Crank Pulleys, because of "harmonics/resonances/dynamics/stuff" that impacts the longevity of the bottom-end (ie. crank bearings, etc). Anyone seen any evidence of issues with this on the ZX2? We have a ZX2 prepped for endurance racing, so longevity is key. On the last engine build we opted out of the underdrive crank pulley, but that weight savings and loss of rotation mass is very appealing for our ZX2 race car.
    Last edited by BryanPendleton; 05-03-2018 at 08:44 AM.

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    I would like to know how well the aluminum/steel pulley works out for you. Also, I hadn't heard arguments about the bottom end problems. On a new engine that would not be great at all. I'm interested in the low end gains as well, but I don't want to shave mileage off my new car!! Will a different sized steel pulley work like the aluminum one and produce similar improvements without the engine wear issues?

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    Im gonna put on the aluminum one which is 4" in diameter. I think the powder is even smaller. Ive not read any complaints about bottom ends in zx2 period. Everything Ive read talks about how tough the little motors are. Youve probably got a good bit of money in your car so im not suggesting anything one way or another because Im still new in the zx2 world. The key is at an angle in the crank/crank timing sprocket/crank belt pulley as soon as we figure out that exact angle the drawing will be done so if/when my aluminum udp dies Ill be ready to go with a steel one if needed.

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    I have an aluminum UDP and have had zero issues with it. I wouldn't be too worried about copying the look and trying to make it in steel as this should last you a good while until it may give you some problems. I bought mine off of Ebay from someone that had some NOS zxtuner UDP's. The UDP came with a belt that was too small so I had to toss the belt and buy a new one that was the next size up.

    John

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    I just put my udp on last night and have to say its a noticeable difference. The idle is better and it spins up quickly to 3500 rpm. I'm definitely a fan so far. Drawing is complete. If my timing belt tracks correctly I don't foresee any problems but if so I have a drawing ready to go if needed.

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