Xoutpost.com - Brembo drill directional

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Because On My Track Car I Use Cross Drilled With Track Pads (lotus Elise) On My Ferrari I Left The Solid Rotors On And Ungraded To The Porterfield R-4s Pads On The 4.8 I Switched To The Porterfield R-4s Pads Also. The Ferrari And The X5 I Drive On The Street Only And I Dont Need Cross Drilled It Wouldnt Make Any Difference. I Dont Mind The Look Of Cross Drilled All Iam Saying Is For Normal Street Use You Really Dont Need Them. And Its Just My Opinon.

Quote:

Originally Posted by f355b

Hayaku races a lot in his P-Car and he basically says the same thing you do about not needing them on the street, so you're in good company.

I'm simply stating that I have used both on my X5 4.4 and found the drilled rotors to give me better performance. It's not my opinion, it's a fact based on my actual experience.

JV

The Best Thing About Any Mod Is Your Happy. I Use Porterfield R4-s Pads And Stoptech S/s Hoses On The X And It Works For Me.

Quote:

Originally Posted by JV

Less gas doesn't mean no gas and it seems to me your real problem is the application (on an SAV) as opposed to the performance differential in the rotors. Many where on the forums would disagree with your statement that the X5 is not a performance car, too. So would BMW.

People spend their $$ how they want to in the end. I have no complaints on my Brembo drilled rotors and with the OEM pads and calipers I've had better braking feel. They were cheaper than OEM solid rotors cause I got them wholesale.

JV

JV:

It is your money, and you should spend it how it makes you happy. Personally, I think that drilled rotors look good. Having said that, we should debunk the myth about outgassing on pads. Modern pads don't outgas. The gases were created from the binding materials in the pads, when they were at elevated temperatures, many decades ago. Not true anymore.

Drilled rotors also get claims of increased surface area for radiation. That is true when rotors are at a steady temperature. Trouble is, braking isn't a steady-state heating. Brake rotors tend to rapidly get hot, and then cool until the next application. Less thermal mass means faster temperature rise.

I would have thought that the removal of the boundary layer of water in the rain would be a better reason for drilled or slotted pads, but with the new brake-drying features on many high performance cars, even that is going away as a justification.

Your brake feel improvement is likely related to the surface finish. A good comparison would be to compare smooth Brembo rotors to drilled Brembo rotors, from the same source. Comparing the Brembo rotors to stock isn't as valid.

I still think they look good. It is just that people try to sell them as a performance improvement, when they aren't. They are a good cosmetic improvement, IMO. :thumbup: