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Porsche > 996 (911) (1997-2005) > 996 GT3 MKII 2003>> > Engine Tuning >

Pulleys

DISPLAYING 1 to 1 (of 1 products)
Under drive pulley. Porsche 996 Turbo / 997.1 Turbo / GT2 / GT3 BBi Autosport - 99610201771, 99610201772, 99610211593, 99610211595, 99610201793, 99610201795 - bbi.996.101.0001
3
Under drive pulley. Porsche 996 Turbo / 997.1 Turbo / GT2 / GT3 BBi Autosport
BBIPULLEY9967
Product Information
Product Information
BBi Autosport under drive pulley.

bbi

Fits
Porsche 996 Turbo
Porsche 996 GT2
Porsche 996 GT3 MK1 and MK2
Porsche 996 GT3RS
Porsche 997 Gen 1 Turbo
Porsche 997 Gen 1 GT2
Porsche 997 Gen 1 GT3

Designed to slow down the power steering pump to prevent it from overheating in racing conditions, this pulley will quickly pay for itself by not just saving your pump, but also your weekend at the track.

The pulley is fully balanced and is a 16% reduction. Its weight has been optimized to be 1/2 that of any other under-drive pulley on the market today.
An additional benefit is increased power and torque across the entire RPM range.

A boss on the front of engine case will need to be cut down slightly to clear the smaller pulley size. Comes complete with the crank pulley and a new smaller belt

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

BBIPULLEY9967
99610201771
99610201772
99610211593
99610211595
99610201793
99610201795

The product you are viewing cross references to these numbers
DISPLAYING 1 to 1 (of 1 products)
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About Pulleys

Porsche Performance Pulleys - Engine Efficiency & Response Upgrades

Engine Pulleys play a vital role in driving auxiliary components such as the alternator, power steering pump, water pump, and air conditioning system. In performance applications, upgraded pulleys can improve engine efficiency, reduce rotational mass, and enhance throttle response—delivering noticeable gains in drivability.

Available from Design911, Porsche performance pulleys are precision-engineered to improve reliability and optimise engine operation, making them an ideal upgrade for tuned, rebuilt, or track-driven vehicles.

What Do Engine Pulleys Do?

Engine pulleys transfer rotational power from the crankshaft to essential engine accessories.

Core Functions:

  • Drive auxiliary systems reliably and efficiently.
  • Maintain correct belt alignment and tension.
  • Regulate accessory speed relative to engine RPM.
  • Support consistent engine cooling and charging.
  • Contribute to smooth engine operation.

Proper pulley function is essential for overall engine reliability.

Why Do Engine Pulleys Fail?

Standard pulleys can degrade over time or under increased engine loads. Common failure causes include:

  • Rubber damper deterioration from heat and age.
  • Cracking or separation in bonded pulleys.
  • Bearing wear in idler or tensioner pulleys.
  • Increased stress from higher RPM and tuning.
  • Belt misalignment due to worn pulley surfaces.

Failed pulleys can cause belt loss, overheating, or loss of charging and power steering.

Why Upgrade to Performance Pulleys?

Performance pulleys are designed to improve durability and efficiency.

Upgrade Benefits:

  • Reduced rotational mass for improved throttle response.
  • Stronger materials for improved longevity.
  • Improved belt alignment and stability at high RPM.
  • Enhanced reliability for tuned and track engines.
  • Supports efficient operation of auxiliary systems.

Upgrading pulleys improves engine responsiveness while reducing the risk of pulley-related failures.

Highlights

  • Porsche performance engine pulleys
  • Improved efficiency and throttle response
  • Designed for tuned and high-RPM engines
  • Durable construction for long-term reliability
  • Essential upgrade during engine rebuilds       

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