Auto Specialties Underdrive Power Pulleys

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Auto Specialties underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump, and air conditioner all rob horsepower from the engine. By replacing factory sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more horsepower available to drive the rear wheels. All pulleys are manufactured from either black nitride steel or aluminum, exceeding factory quality. Black Nitride Steel is the most durable finish and recommended where available for long-term durability. Other benefits include reduced wear on the accessories and improved fuel economy!

To install, you simply remove the belt, then unbolt the factory pulleys. Install the underdrive pulleys in place of the factory pulleys that have been removed. Re-install the factory belt or the appropriate new belt if another size is specified in the instructions. Requires only simple hand tools and takes 45 minutes to an hour.

Auto Specialties underdrive pulleys are 50 state smog legal and are backed with a lifetime warranty.

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Product Reviews

Good value - 09/24/2008
Review for: Black Aluminum Underdrive Crank Pulley

From Michigan Reviewer: jerry weaver Own this product - Yes

Recieved within one week. Easy installation. Belt part number for gates belt was right length. Only minor problem was converting part no. They should give belt size and other supplier part numbers. I can feel a little bit more low end, but nothing drastic.

Good product, GREAT customer service! - 09/11/2008
Review for: Nitride Aluminum Harmonic Balancer Crank Pulley and Overdrive Alternator Pulley Set

From Wisconsin Reviewer: Jonathan Brandt Own this product - Yes

The product was fine, well made and easy to install. The shipping from the manufacturer took almost two months and initially was wrong. This is where the customer service from Performance Center really shined. They were great, dealt with the manufacturer and were responsive to my calls. Excellent service and it all worked out in the end. I am a very satisfied customer and WILL order from Performance Center again... maybe today.

Worth the money! Do it! - 08/29/2008
Review for: Black Aluminum Underdrive Crank Pulley

From St. Louis MO Reviewer: From A Customer Own this product - Yes

Those of us blessed (read: cursed) with GMs redheaded-step child of a motor, AKA the 2.2 need all the help we can get trying to squeeze more horses to the wheels right? Well let me tell you the ASP crank pulley is the way to go. I combined it with the GM universal alternator pulley to keep the ratio the same. All I can say is this simple mod really woke up my engine. It revs faster, almost completely ridding the motor of hesitation when I press the gas. Proven 7hp/12lbs torque! What are you waiting for?

Get it! - 08/29/2008
Review for: Black Nitride Steele Underdrive Alternator Pulley

From St. Louis MO Reviewer: From A Customer Own this product - Yes

If you have the crank pulley, its a good idea to add this alt pulley to keep the ratios the same and your alt spinning right. Just make sure you use an impact wrench on the nut holding the stock pulley on...unless you have big channel locks and a strong friend! Great bolt-on mod when combined with a crank pulley, proven horsepower and torque, inexpensive, DO IT!

Power Pulleys 94 Cobra Mustang - 08/19/2008
Review for: Black Anodized Hard Aluminum 3 Pulley Set

From Lanc. PA Reviewer: C Barnett Own this product - Yes

Easy to install and a noticable power gain. Great price.

under drive pulley for 3rd gen prelude - 08/11/2008
Review for: Clear Hardcoat Aluminum Crank Pulley

From Alabama, USA Reviewer: From A Customer Own this product - Yes

A well made product that was much cheaper then an unorthodox pulley. i only wish more parts were available for my make/model prelude. I would love to find some copper exhaust gaskets.

2 pulley set - 07/30/2008
Review for: Black Anodized Hard Aluminum 2 Pulley Set

From MA Reviewer: colin bradford Own this product - Yes

Inexpensive, easy to install, noticeable increase in performance and fuel economy.

Pulleys - 07/15/2008
Review for: Black Nitride Steel 3 Pulley Set

From Wichita, KS Reviewer: From A Customer Own this product - Yes

Nice set of pulleys. Easy to install for us that are not mechanically inclined. All the parts necessary for the install were included. Once installed, I did not have any issues with the alternator or water pump. Temp went right to normal and stayed there. No headlight flare with a load on the alternator (A/C, stereo and headlight all on at the same time). Overall a good product.

very good - 06/04/2008
Review for: Two Pulley Set for Dodge V6 and V8 Engines.

From sunrise florida Reviewer: From A Customer Own this product - Yes

i have a dodge ram 1500 with a 5.2L its a 95 at first it took about 2 weeks for it to come but when i got and put it on my truck started to hull ass

pulley - 04/24/2008
Review for: Single Pulley Set for Dodge V6 and V8 Engines.

From beeville tx Reviewer: From A Customer Own this product - Yes

well prompt delivery,easy 15 min install on v6 3.9l.was a lil disapointed i was only a one pulley set only came with crank pully but over all i think a good buy.for the price

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