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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > F1 AutohaŘs |Slotted vs X-Drilled vs Slotted/X-Drilled Info



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      10-01-2009, 03:59 AM   #1
Anthony@F1 AutohaŘs
 
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Cool F1 AutohaŘs |Slotted vs X-Drilled vs Slotted/X-Drilled Info

Well, I have been lately getting alot of emails and PM about what is the Difference between the 3. So here it is..

Slotted Rotor

  • The slots on the rotor helps clean the brake pad, which improves bite.
  • The slots on the rotor will slice the brake pad allowing the pad to bite harder into the disc causing an increase in disc temperatures. This will bring your brakes up to temperature faster , but might also take you too far decreasing the benefit. The slotted rotor coupled with a race pad which need to be heated would be optimum.
  • Slotted rotors will also cause slightly more brake pad wear and tear giving you less miles on a pad before it needs to be replaced. Shorter maintenance schedule.
  • Slotted rotors allow gas to ventilate during brake fade.
  • Slotted rotors are less prone to cracking then the cross drilled rotor.
  • Slotted rotors weigh more.
  • Slotted rotors have more disc surface.
  • Slotted rotors maintain around 96% of the friction surface


X-Drilled Rotor

  • Drilled Rotors offer an enhanced initial bite.
  • Drilled Rotors perform better in wet weather over the slotted rotor. Due to volume of a hole vs a slot.
  • Drilled Rotors are more prone to cracking than slotted.
  • Drilled Rotors allow gas to ventilate during brake fade.
  • Drilled Rotors offer a performance benefit since there lighter in weight.
  • Drilled Rotors have more ventilation so they should cool off faster , but have less rotor material so they could get hotter than a slotted rotor. But its hard to say as the slotting also increases heat.
  • Drilled rotors maintain around 85-93% of the friction surface


Slotted/X-Drilled Rotor

  • The slotting will increase rotor heat.
  • The drilled holes will increase the cooling after braking.
  • The drilled holes will increase the water braking.
  • Drilled and slotted are going to weigh less from the same manufacturer. Other designs might be lighter from company to company.
  • Drilled and slotted will give the most performance benefit to acceleration due to the lighter weight.
  • Drilled and slotted will also be the hardest on your brake pad (wear and tear)
  • Drilled and slotted only maintain 80-91% of the friction surface.

-Anthony@F1 Autohaus
Anthony@F1 AutohaŘs is offline   United_States
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