Description

Dinan's underdrive pulley is designed to increase power (11 horsepower 8400 RPM and 7 lb-ft torque 8400 RPM on a stock car) by reducing parasitic drag on the engine from spinning the alternator, water pump and AC compressor. This is accomplished by slowing down the speed of these accessory drives that rob power from your engine. Dinan has done extensive hot weather testing so you can be assured that your engine is safe. The Dinan underdrive pulley is made of aircraft quality 6061 alloy. is anodized black and does not modify your harmonic damper as some underdrive pulley kits do which can be harmful to your engine.

This product is backed by our industry-leading 4 year/50,000 mile warranty so you can rest assured that you are purchasing the best quality product for your BMW.

Note: BMW changed the belt configuration from a single-sided power steering and AC belt to a double-sided belt for M3's that were produced after May 2008. Please check with your dealer to find the correct Dinan part number below.

Features

  • All accessories are underdriven to decrease drag on the engine (water pump & alternator underdriven by 16%; AC & power steering underdriven by 19%).
  • Lightweight billet aluminum crankshaft pulley, black anodized and engraved.
  • Includes shorter belts.

Specifications

BrandDinan
Dinan Point Value1
Emission Code5
Height6
Labor Time (Hours)2.4
Length4
Peak HP11 @ 8400 RPM
Peak Torque (lb-ft)7 @ 8400 RPM
Product TypePulley Kit
Weight2
Width6

Compatibility

  • 2008 - 2013 BMW M3 Base Coupe 4.0
  • 2008 - 2013 BMW M3 Base Convertible 4.0
  • 2008 - 2011 BMW M3 Base Sedan 4.0

Dinan's underdrive pulley is designed to increase power (11 horsepower 8400 RPM and 7 lb-ft torque 8400 RPM on a stock car) by reducing parasitic drag on the engine from spinning the alternator, water pump and AC compressor. This is accomplished by slowing down the speed of these accessory drives that rob power from your engine. Dinan has done extensive hot weather testing so you can be assured that your engine is safe. The Dinan underdrive pulley is made of aircraft quality 6061 alloy. is anodized black and does not modify your harmonic damper as some underdrive pulley kits do which can be harmful to your engine.

This product is backed by our industry-leading 4 year/50,000 mile warranty so you can rest assured that you are purchasing the best quality product for your BMW.

Note: BMW changed the belt configuration from a single-sided power steering and AC belt to a double-sided belt for M3's that were produced after May 2008. Please check with your dealer to find the correct Dinan part number below.

Features

  • All accessories are underdriven to decrease drag on the engine (water pump & alternator underdriven by 16%; AC & power steering underdriven by 19%).
  • Lightweight billet aluminum crankshaft pulley, black anodized and engraved.
  • Includes shorter belts.
BrandDinan
Dinan Point Value1
Emission Code5
Height6
Labor Time (Hours)2.4
Length4
Peak HP11 @ 8400 RPM
Peak Torque (lb-ft)7 @ 8400 RPM
Product TypePulley Kit
Weight2
Width6
  • 2008 - 2013 BMW M3 Base Coupe 4.0
  • 2008 - 2013 BMW M3 Base Convertible 4.0
  • 2008 - 2011 BMW M3 Base Sedan 4.0

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