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Old 03-28-2010, 02:57 AM   #1
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ZZP underdrive pulleys

Installed them today. I figured I'd make a thread for anyone who was curious about doing this mod. First of all, underdrive pulleys work by slowing the rate of the accessories and reducing rotational mass (they are significantly lighter). This allows more of the engines power to go to the rear wheels. ZZP claims 3rwhp at 6,000 RPM for the 14% reduction water pump pullley on a stock engine and slightly more on a modified setup. It doesnt claim a gain for the 10% reduction alternator pulley. I got both the water pump and alternator pulleys. Im guessing I might have gained between 5-10 hp since its a bolt on/tuned car. If you only get one of the pulleys, you can use a stock sized belt. If you get both like I did, you'll need a size 150 belt.

The install:

1. Disconnect the negative terminal on the battery.
2. Loosen the 4 bolts on the water pump pulley with the belt still tensioned
3. Loosen the bolt on the alternator (this will be difficult without an impact wrench)
4. Twist the bolt on the tensioner pulley to make it swing down in order to remove the belt.
5. Remove the belt and the stock pulleys.
6. Install the water pump underdrive pulley and tighten the 4 bolts by hand.
7. Do the same for the alternator pulley bolt.
8. Install the new belt (or stock belt) and follow the belt routing guide on the inside of the engine bay.
9. Tighten the water pump pulley bolts.
10. Tighten the alternator pulley bolt to spec. (again, a torque wrench would come in handy)
11. Reconnect the negative battery terminal.

-I installed a new alternator at the same time so what I did was take my new alternator to a shop and have them torque the pulley on there. You could do the same with the stock alternator if needed. Its really easy to remove and most shops would do it for free because its so quick and easy.

Results: I noticed slightly quicker revs and more torque throughout the powerband from this mod. The car chirps shifting from 1st to 2nd at WOT alot more than it used to (pretty impressive for an auto) which is one thing that really stood out to me. Overall I am pleased with it for how simple it was although it was somewhat expensive for everything.

Cell phone pics ftw! haha

Stock pulleys:





Underdrive pulleys:





Some new engine bay pics:





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Old 03-28-2010, 03:41 AM   #2
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Nice! Not a fan of the K&N or 3.8L badging...
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Old 03-28-2010, 04:03 AM   #3
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Nice! Not a fan of the K&N or 3.8L badging...
I think you deserve a thank you for pointing these out to me. The badging was just something I randomly did one day. I'm just trying to be different.
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Old 03-28-2010, 12:58 PM   #4
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I love your painted 3800 thing. thx for writing this out. I might have to do this myself.
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Battousai wins the "best explanation ever" award.
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Old 03-28-2010, 03:36 PM   #5
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i love it too looks sweet!
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Old 03-28-2010, 05:01 PM   #6
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lmao, i just went out there and painted mine. Only i did everything black. TS's looks much better though with red/black



Is the 3 whp claim with the alternator underdrive pulley or both?
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Old 03-28-2010, 07:50 PM   #7
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That was actually Kris' idea to paint that so you have to give him credit too. lol

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Is the 3 whp claim with the alternator underdrive pulley or both?
It was just for the water pump pulley.
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Old 03-28-2010, 08:16 PM   #8
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Old 03-28-2010, 08:26 PM   #9
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Alternator pulley - $50.00
Water Pump Pulley - $70.00
Serpentine Belt - $32.00
Spending all this to get 5-10 horsepower out of your v6 - Priceless
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Old 04-04-2010, 05:04 AM   #10
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Where did you purchase them?
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Old 04-04-2010, 05:22 PM   #11
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Old 04-04-2010, 07:58 PM   #12
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Did you go under the grand am section?
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Old 04-04-2010, 08:05 PM   #13
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No go under the Grand Prix section.
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Old 04-04-2010, 08:22 PM   #14
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found it, thanks
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Old 04-05-2010, 03:10 PM   #15
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NICE! I might do this eventually - and that is one clean motor .
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Old 06-26-2012, 09:16 PM   #16
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So you can use your stock belt if you get both the water and alternator underdrive pulleys. Or do I need a bigger belt.
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Old 06-26-2012, 09:23 PM   #17
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Quote:
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So you can use your stock belt if you get both the water and alternator underdrive pulleys. Or do I need a bigger belt.
Stock belt can be used with one or the other but not both. Both pulleys require next size up (1" bigger) belt.
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Old 06-26-2012, 09:23 PM   #18
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You have to have aa bigger belt. Just send their customer service a email saying what you have and they'll tell you what belt size to get
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Old 06-26-2012, 09:33 PM   #19
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Cool I will do that thanks.
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Old 06-27-2012, 03:08 AM   #20
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Wow, that is one clean engine...I have to do some cleaning...
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