Reduce parasitic loss of power on your BMW's engine by safely under driving the belt driven auxiliary systems. Reducing this drag on your engine results in MORE HORSEPOWER AND TORQUE to the wheels of your BMW. Our BMW underdrive power pulley kits are specifically designed for each BMW application to make the best power while maintaining stock driveability and reliability, eliminating potential downsides. Others may advertise "their" pulleys boasting more power, but we concluded that for street and track driven BMWs, ours are the best size and design to ensure both your engine and it's belt-driven systems (alternator, water pump, power steering etc) are well within safe operation. We run these under drive pulleys on our own BMWs, so we would not want them any other way.
Available for the following BMWs: (click icon to change BMW)
As used on our racecars and street cars, these are engineered not only to be the best pulley kits on the market but also to provide the best compromise between performance and reliability. Specifically, we have designed
them to underdrive the water pump, power steering pump and alternator*. Adding these is like getting FREE HORSEPOWER - there are no downsides and underdriving
each of these accessories has been proven safe through years of on and off-track use. We do not believe it is safe to change the crankshaft pulley due to the potential harm to the crankshaft. These kits provide a 10%-20% overall reduction
in driving your car's systems and have been dyno-tested with a gain of up to 11hp.
Kit includes water pump, power steering, alternator pulleys and belt. The T-6061 hard anodized aluminum pulleys account for a 10 to 20-percent decrease in accessory speeds, reducing the load on the engine but still maintaining a safe margin for reliability on all components. Installation involves removing the fan for easy access to the front of the engine. The main drive belt comes off easy and each pulley is mounted with Allen head bolts. Typical installation time is 1.5 hours. New main drive belt is included. The pulleys were good for 10.7hp at 6960 rpm and 8.1 lb-ft of torque at 5550 on the 1995 M3.
*Alternator pulleys - we offer two kits, one for the performance minded individual and one for the serious audiophile. If you have a significant additional load on the alternator, from aftermarket audio amplifiers, you will not want to underdrive the alternator. Thus, we simply lighten that pulley rather then underdrive it. Choose from the menu below if you have a stock or an upgraded stereo.
For all kits we now ship both BOSCH and VALEO alternator pullies! We will charge you for both and we include a postage paid box to send the one back that you don't need. You will get a $64 refund once we get it back (final cost after refund is the price below, in red.) If you know what type of alternator you have please indicate it in the Special Instructions field on your online order, otherwise we will send you both pullies
This underdrive pulley kit fits the following BMW:
1997-2000 E39 5 Series 528i 6 cylinder
2001-2003 E39 5 Series 525i, 530i 6 cylinder
Part #: PPK-E39
Price: $249.00 (USD)
Underdrive Pulley Kit - Evosport - E39 540i 99-03
(more info) Engineered to provide the best compromise between performance and reliability for your BMW! Specifically, we have designed them to underdrive the water pump, power steering pump and alternator*. These kits provide 10%-20% overall reduction in driving your car's systems and have been dyno tested to provide up to 12hp gain!
This item fits the following BMWs:
1999-2003 E39 BMW 540i
Underdrive Power Pulleys
