BMW Drive Belts & V-Belts for BMW Z Series E85/6 (2003-2008)

Clear BMW chassis

Please ensure your correct model is selected

Your BMW's drive belts are wear items, and will degrade and crack over time. Don't wait until you have a belt failure... don't get stranded! Replacing your BMW's belts, such as the alternator belt, power steering belt, air conditioning AC belt, or serpentine belt is a low cost insurance policy to preventing a break down -- or worse, engine damage. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones.

While also inspecting your serpentine belts, also check for wear or resistance in the pulleys. The tensioner pulley and deflection pulley are the primary sources for belt squealing. The rubber-isolated pulleys can also break apart, leading to total belt failure. We sell the tensioner and deflection pulleys for the M50 engine family used in the E34, E36, E39, E46, X5, Z3, and Z4.

Sub-Categories

Sort By:
Turner Motorsport Power Pulley Upgrade Kit - Z4 M Roadster & Coupe
Turner Motorsport Power Pulley Upgrade Kit - Z4 M Roadster & Coupe ...
10X Entries Into Our F80 M3 Sweepstakes
Turner Motorsport - Corporate Logo
T#:3465
Part#: PPK-MZ4
Ships in 9 Business Days
Sale - Save 25% $ 354.99

This product was last offered at the strikethrough price on
06-13-2026

$ 266.24 USD
Free Shipping
Add to Wish List
Sale - Save 25%
$ 354.99

This product was last offered at the strikethrough price on
06-13-2026

$ 266.24 USD
Free Shipping
Add to Wish List
Underdrive Power Pulleys work to 'free up' horsepower. Any accessory that spins from the main drive belt is using up power. That's power that could otherwise be used to move the car. By giving some of that power back to the engine, you can make the car faster! It's like FREE HORSEPOWER !

Underdrive pulleys for your BMW will slow down engine-mounted accessories - the water pump, power steering pump, and alternator*. These systems contribute to 'parasitic losses' - power lost from what the engine could produce if it did not have these systems. Since less energy is used to move them, that power is transferred back to the engine and used to propel the car. Our pulleys give a 10-20% reduction in rotation, releasing up to 11hp on most BMW six-cylinder engines. There's also a small but noticeable improvement in throttle response too! We have done extensive testing and development work, both on and off the track, to ensure that the accessory systems function as they should. On our Racing pulley kits we actually underdrive certain components more so we feel our Street pulleys are an ideal compromise between power/torque gains, reliability, and system performance. Our pulley kits have been on the market for over ten years, and used in all of our own cars, with zero component failures related to their use.

Our pulleys are made from T-6061 aluminum and finished in a durable black hard anodize that is very resistant to wear, chemical exposure, and heat. We designed our pulleys to look similar to the factory parts but also to be stronger and, in most cases, slightly lighter too. For example, With our hardcoat aluminum you will never have to worry about a serious failure of a stock plastic pulley. A 'stealth' approach to aesthetics was our goal and we let the results speak for the pulley design. Installation is straight forward and easy with simple hand tools. Removal of the fan is required for access to the front of the engine. Total install time for a 3-piece pulley set should be around 1.5 hours. A new longer belt is included and we also recommend replacing the separate A/C belt, belt tensioners, and the guide and deflection pulleys at the same time.



Additional Info
Clickhere for example dyno graph

Click here for installation instructions.

Turner Pulley Kit contents:
  • Turner water pump pulley
  • Turner power steering pump pulley
  • new extended length belt
  • instructions

    This underdrive pulley kit fits the following BMW:
    2006-2008 MZ4 Z4 M Coupe / Z4 M Roadster
    • Show More Show Less
    OEM Accessory Belt Kit - E46 M3
    OEM Accessory Belt Kit - E46 M3
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:554437
    Part#: E46M3ACCKT
    Ships in 1-2 days
    $ 350.99

    This product was last offered at the strikethrough price on
    08-24-2026

    $ 282.99 USD
    Free Shipping
    Add to Wish List
    $ 282.99 USD
    Free Shipping
    Add to Wish List

    Over time, accessory belts begin to wear out and crack. This can lead to the belt slipping, squeaking, or even snapping. Replace your belts and tensioners on a regular basis to ensure you don't end up stranded on the side of the road with a dead battery or over heated engine due to a bit of simple overlooked maintenance. This kit includes all of the items that will need replaced such as the belts, tensioners, and hardware.

    Fits the following BMWs:
    2001-2006 E46 BMW M3

    Show More Show Less

    Select Vehicle

    BMW Mini
    Clear Vehicle

    Purpose

    Category

    Brand

    Price

    $
    $

    Special Offers

    Shipping