Power Pulley Kit for Z4 2.5/3.0 2003-2005
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, and the alternator*. The Z4 has electric power steering and
therefore does not need a third pulley. 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.
water pump, alternator pulleys, and belt.
The Z4 has electric power steering and therefore does not need a third pulley.
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
Applications: 2003 - 2005 Z4 2.5/3.0 (Z4) -