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BMW Underdrive Pulley Set - UUC Motorwerks UDPE362

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Underdrive Pulley Set by UUC Motorwerks

Replacement accessory pulleys for the water pump and power steering pump that use less engine power, gains of 5-11hp. Kit includes a new accessory belt.

A car's engine does many things other than just making the car move. Power is used to run the various accessories like the water pump, power steering pump, and alternator. All of these use horsepower, horsepower that is lost. Power that could be making the car faster.

Each accessory uses rotary power - each accessory is turned to perform it's function, whether it's an electrical component (the alternator) or a fluid displacing component (the water pump and power steering pump). They all have a pulley which takes power from the crankshaft pulley via a belt. Some of the engine accessories take more power than they really need, dramatically affecting engine performance. Driving these accessories at higher rpm is a waste of energy, running it at a much higher rate than it needs to for optimum effectiveness. This is energy which could be put toward acceleration instead.

What's an underdrive pulley?

An underdrive pulley is a replacement accessory pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley, the speed at which the accessories are turning relative to engine RPM decreases.

Does this actually make horsepower?

Underdriving the accessories does not add power to the engine, it frees up the power that is normally wasted on overdriven accessories. The theory is that a larger pulley will drive the accessories slower thus reducing their parasitic horsepower loss. No more power total, but more power sent to the wheels. As an additional benefit, the reduction in wear (less usage) on the accessories due to the lower duty cycles can extend the life of these parts.

However, a look at each pulley-driven system under the hood will tell you why it isn't as simple as "just a bigger pulley".

Which accessories can I underdrive?

Of the four accessories that can be underdriven with a larger drive pulley, one is electrical (the alternator) and two are fluid pumps (the water pump and the power steering pump). The fourth is a compressor (the air conditioning unit). UUC Motorwerks Ultimate Underdrive Pulley set provides replacement pulleys for the water pump, and power steering pump.

What abut the weight?

Some companies have been marketing replicas of UUC's original pulley design, but advertising them as superior due to "light weight". This clearly shows these replica manufacturers do not have an understanding of the underdrive concept. Weight reduction is not a factor in producing power with underdrive pulleys. The gain comes from reducing the accessory speed, not from less rotating mass.

Why does UUC offer accessories pulleys instead of a replacement crankshaft pulley?

At UUC Motorwerks, our goal is improvement of the total performance envelope. We don't want to provide a product that is only appropriate to some cars and some circumstances. By using an underdrive system based on the accessory pulleys, UUC has the ability to fine-tune the specs of each pulley. None of the accessories on your car have identical operational parameters, why should the pulleys that drive them?

Country of Manufacture: United States
Manufacture Quality: Performance
Shipping Weight (lbs): 0.350

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About UUC Motorwerks

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UUC Motorwerks was started in 1998 by a group of motorsport enthusiasts. These performance minded people had the desire to produce street upgrades and race components that would be of the highest quality available.

"When we see the need for a part, it's because the offerings in the marketplace are simply not good enough. If we can make it better, we'll make it. If we make it, it will be the best. That's our design and manufacturing philosophy here at UUC Motorwerks. ...If you ever get these kinds of questions: 'Why do you need new wheels when the old ones are fine? Why do you need new suspension if the current ones aren't worn out? Isn't your current car fast enough?' - we empathize with you." - UUC Motorwerks

UUC is committed to feeding your automotive addiction. is proud to offer these quality products to our Motorsport enthusiast customer base.

If this is not the exact Underdrive Pulley Set you are looking for, or you would like this part in a brand other than UUC Motorwerks, please call us at (800) 467-9769 and one of our customer service experts will help you locate the exact part you need.

Vehicle Fitment & Notes

Click a year range, make, and model below for additional information.

+ BMW 323i 1998-1999

+ BMW 323is 1998-1999

+ BMW 328i 1996-1999

+ BMW 328is 1996-1999

Warranty® is pleased to offer a one (1) year warranty on all parts. Your Underdrive Pulley Set may be exchanged if it is defective within 365 days of your purchase date. Defective parts are only eligible for an exchange or store credit. No cash refunds will be issued for previously installed parts.

After one (1) year® will honor any extended manufacturer warranties. No exchange will be offered outside of the manufacturer's warranty process. Parts covered by the manufacturer warranty need to be exchanged through the manufacturer and may take up to 4-6 weeks.

If you would like to initiate a warranty claim or have questions about the process, please call us at (800) 467-9769 and a knowledgeable customer service expert will assist you.

Delivery & Returns

Delivery Info® proudly offers FREE shipping available on most orders. Some weight and size restriction apply. We also provide inexpensive and guaranteed 3 day, 2 day, and Overnight shipping options, so if you need your Underdrive Pulley Set tomorrow,® can deliver!

Every® order is fast, reliable, and track-able, meaning you'll know exactly where your Underdrive Pulley Set is at every step of the delivery process.® also displays your Expected Ship Date and transit time in your Cart, making our entire shipping process simple and transparent.

Every order consisting of all "In Stock" parts received before 5 PM ET Monday – Friday will ship the same business day. Every order consisting of all "In Stock" parts received after 5 PM Monday – Friday will ship the next business day.® stocks and ships all of our parts from our warehouse in Windsor, CT. Do not be fooled by drop shippers that claim to have everything and then hit you with three delivery charges. All of our parts come in the same box quickly and via your chosen delivery method and carrier. That's the® stock and ship advantage.

Returns Info® proudly offers a ninety (90) day cash return for all items purchased through®. The item must be new and in its original manufacturer packaging to be eligible for a cash refund.

If you would like to return an item or have questions about the process, please call us at (800) 467-9769 and one of our customer service experts will be happy to help.