Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. #1
    Join Date
    Mar 2011
    Location
    Beaverton, OR
    Posts
    979

    Underdrive Pulleys, who's got em? Worth the $$??

    Most sites claim up to 10-11hp gain from a set of underdrive pulleys, is that hp increase legit and actually noticable? At high/low rpm range? And is it worth $200+? I'm trying to squeeze some more power out of my car, this seems like an easy way to get a few extra ponies, simple install at least. I just have a hard time spending over $200 on a couple pulleys, seems ridiculous. The Turner kit actually comes with 3, one for the alternator as well, but it's also $250 plus shipping. Looking for someone who's got a set on their car to fill in the blanks for me, thanks!

    Rouge Engineering - $195 +s/h
    http://www.rogueengineering.com/mm5/merchant.mvc?

    UUC from ECS Tuning - $230 free s/h
    http://www.ecstuning.com/BMW-E46-330...nce/ES2777201/

    TMS - $250 +s/h
    http://www.turnermotorsport.com/show...t-e46-325i330i
    2016 BMW M340i


    BMW CCA Member . Dinan Stage 1 Software . Dinan 3.5" Exhaust . Dinan CAI & Turbo Inlet . VSRF Charge Pipe . H&R Sport Springs . CF: Front Splitter, Rear Valance, Trunk Spoiler, Roof Spoiler, M3 Mirror Covers . BMW Performance pedals . Gloss black ///M kidneys . 12mm F / 15mm R BMS Spacers. NGK 94201 Plugs .

    2013 BMW X5 M-Sport - Sold
    2009 550i M-Sport - Sold
    2006 650i Vert - Sold
    2004 330i ZHP - Dead
    2001 330i Sport - Sold
    2004 330i ZHP - Sold
    1999 E36 M3 - Sold

  2. #2
    Join Date
    Feb 2011
    Location
    Valparaiso, IN
    Posts
    3,595
    It might be legit technically, but the butt dyno didn't agree. Just my $0.02.


    Sent from my iPhone


  3. #3
    Join Date
    Nov 2012
    Location
    22841
    Posts
    9,921
    Rogue are on my list. Plus they are not plastic like the factory ones.

    His - 2004 Imola Red / Alcantara 330i | 6MT | ZHP |

    Her's - 2005 Black Sapphire Metallic / Black Leather 330i | 6MT | ZHP |

  4. #4
    Join Date
    Jan 1970
    Location
    Southern California
    Posts
    18,064
    My experience was that there wasn't much of a difference. Maybe the engine seemed to breathe a little easier at higher speeds at higher revs, but really hard to quantify. Truly worth $200? Meh. Not unhappy I did it though. Plus they are better than plastic.

    Sent from mobile
    Randeaux/Rando/John/jr - '06 Cic ZHP; Southern California
    "ZHP or not, I still like you"


    ZHP Performance Package, Cold Weather Package, Leather, Jet Black/Black/BlackCube, NAV, Anthracite Black "my individual" interior trim
    ESS Stage 1 Twin Screw Supercharger, Sprint Booster, BMW Perf Intake, Magnaflow Exhaust, Dinan TB & STEP S/W, UCC Sway Bars, Apex EC-7 18x8.5 ET38
    Suspension: AST 44100 dampers, Bimmerworld front adjustable end links, Swift springs (8K front, 10K rear), Vorshlag camber plates
    Dynavin D99+, Hardwire V1 (w/V1 Connection), BSW Stage 1 Speakers, Kicker Amp/Subwoofer
    BMW Performance Strut Brace, Orion V2 Angel Eyes, No-holes License Plate, SMG Paddle Shift Mod, Besian VANOS, Gold DISA, Fan Delete, M3 Side Mirrors
    Note: Actual car no longer resembles signature picture

  5. #5
    Join Date
    Feb 2014
    Location
    Alexandria, VA
    Posts
    2,805
    Quote Originally Posted by Cadeez View Post
    Most sites claim up to 10-11hp gain from a set of underdrive pulleys, is that hp increase legit and actually noticable? At high/low rpm range? And is it worth $200+? I'm trying to squeeze some more power out of my car, this seems like an easy way to get a few extra ponies, simple install at least. I just have a hard time spending over $200 on a couple pulleys, seems ridiculous. The Turner kit actually comes with 3, one for the alternator as well, but it's also $250 plus shipping. Looking for someone who's got a set on their car to fill in the blanks for me, thanks!

    Rouge Engineering - $195 +s/h
    http://www.rogueengineering.com/mm5/merchant.mvc?

    UUC from ECS Tuning - $230 free s/h
    http://www.ecstuning.com/BMW-E46-330...nce/ES2777201/

    TMS - $250 +s/h
    http://www.turnermotorsport.com/show...t-e46-325i330i
    I had thought about them as well, but decided against it. I noticed a massive difference just refreshing/replacing the worn pulleys/belts on my car with OEM and a aluminum water pump pulley from ECS. I would spend the money on that job instead, the car had noticeably more punch and ran smoother.

    Current:
    1988 BMW 325is
    1996 Toyota Land Cruiser FZJ80 x3 Locked - Restoration/Project Thread on ih8mud.com
    Sold:
    "Scarlett" the 2005 BMW 330i ZHP 6MT - Project/Maintenance Thread
    2011 BMW M3 E92 6MT - Info/Maintenance Thread

  6. #6
    Join Date
    Feb 2014
    Location
    Boston Metro West (BMW)
    Posts
    1,738
    I too looked into going this route. My research yielded the same results as the posts above, not much of a difference. So, rather than chance it, I went with new OEM. Stopped my terrible squeak.
    Patrick ///04 330i ZHP///BMWCCA#465139///Jim Conforti Shark Injector///H&R Touring Cup Kit///Gruppe M Intake



  7. #7
    Join Date
    Dec 2014
    Location
    jacksonville FL
    Posts
    171
    i am running an underdrive set. didn't notice any discernible difference. one additional thought though, when you switch you can no longer run the stock belt. you have to order which ever belt length is required for your set of pulleys.

  8. #8
    Join Date
    Jan 1970
    Location
    Huntsville, AL
    Posts
    4,397
    I've got the Turner's and will say it was the best addition I ever made. I've owned my ZHP since 12-23-2006 @ 28,090 miles. The Turner Pulley's were installed on 3/7/2009 @ 64,725 miles. Best mpg before was 29.36069 and after (on the way to the 2013 ZHP reunion) 32.07311. The performance upgrade is significantly noticeable and today @ 137,250+ I have only had one issue with the power steering pump that cured itself and may not be related.

    (added) Turner makes 2 sets, one for high end stereo, one for max power. I have max power.

    One interesting fact: a few years ago, I took a Dinan ZHP for a test drive from EAG with my Son (27) and Son-in-Law (29). The car had a Dinan CAI, Throttle Body & Stage 3 software. During and after the test drive, it was the general consenses, hands down between the three of us, that mine would have undoubtedly left that thing in the dust, was far more responsive, and had significantly more pull

    Dinan; Hign Flow Intake System, & Strut Tower Brace
    Turner Motorsports; Underdrive Power Pulleys
    Koni Sport, Bridgestone; Potenza RE-11, Coby Wheel
    Stewart High Performance Water Pump
    Hawk High Performance Street 5.0 Brake Pads
    Brembo Rotor

    The purposeful face of a formidable athlete:

    The spine-tingling 330i Performance Package.

    Purchased CPO on 12/23/2006 with 28,090 miles

  9. #9
    Join Date
    Feb 2014
    Location
    Kitchener, ON
    Posts
    6,036
    Quote Originally Posted by 3ZHPGUY View Post
    I've got the Turner's and will say it was the best addition I ever made. I've owned my ZHP since 12-23-2006 @ 28,090 miles. The Turner Pulley's were installed on 3/7/2009 @ 64,725 miles. Best mpg before was 29.36069 and after (on the way to the 2013 ZHP reunion) 32,07311. The performance upgrade is significantly noticeable and today @ 137,250+ I have only had one issue with the power steering pump that cured itself and may not be related.

    (added) Turner makes 2 sets, one for high end stereo, one for max power. I have max power.

    One interesting fact: a few years ago, I took a Dinan ZHP for a test drive from EAG with my Son (27) and Son-in-Law (29). The car had a Dinan CAI, Throttle Body & Stage 3 software. During and after the test drive, it was the general condenses, hands down between the three of us, that mine would have undoubtedly left that thing in the dust, was far more responsive, and had significantly more pull
    guy, thanks for the feedback. i had been considering this as i don't like the idea of plastic pulleys, although when i refreshed my cooling system last summer i used an aluminum WP pulley. now i want to get that plastic PS pump pulley out of there! i may go for the TMS kit.

    peter
    peter

    2004 330i ZHP
    2005 330iT ZHP
    2010 328iT M Sport

  10. #10
    Join Date
    Jan 1970
    Location
    Huntsville, AL
    Posts
    4,397
    Quote Originally Posted by slater View Post
    guy, thanks for the feedback. i had been considering this as i don't like the idea of plastic pulleys, although when i refreshed my cooling system last summer i used an aluminum WP pulley. now i want to get that plastic PS pump pulley out of there! i may go for the TMS kit.

    peter
    No problem, Peter. I have every tank of gas logged for well over 100,000 miles. When I was in Ohio, I could get a pretty good calculation of before and after however; now that I'm in the back hills of Southern Middle Tennessee, it's way too much fun, to keep my foot out of it, to calculate mileage. Let me know if you need the data I have.

    guy

    Dinan; Hign Flow Intake System, & Strut Tower Brace
    Turner Motorsports; Underdrive Power Pulleys
    Koni Sport, Bridgestone; Potenza RE-11, Coby Wheel
    Stewart High Performance Water Pump
    Hawk High Performance Street 5.0 Brake Pads
    Brembo Rotor

    The purposeful face of a formidable athlete:

    The spine-tingling 330i Performance Package.

    Purchased CPO on 12/23/2006 with 28,090 miles

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