[TheBusher]

What's the difference between the two??? Is there a difference performance wise, or is it purely asthetic?

[DanTheMan]

Drilled rotors are mainly meant for race cars, and can actually crack with everyday driving. Slotted rotors are better for a street car, but when it's wet braking may be hindered slightly. That's what I've heard anyway.

[gsjohnson]

Why not both? One helps the rotors cool and the other helps the gasses to escape with better pad grip as a result.

[ZOOTOXIN]

Originally Posted by DanTheMan Drilled rotors are mainly meant for race cars, and can actually crack with everyday driving. Slotted rotors are better for a street car, but when it's wet braking may be hindered slightly. That's what I've heard anyway.

I have the Ford racing Slotted and drilled and have had no problems yet, but I do check the holes for hair-line cracks now and then because I heard
cracking is common.

[sstang]

Drilled rotors are not a good idea on street cars. Rotors are drilled to keep them cooler under hard braking conditions (racing)so they dont get excessively hot...brakes work by friction and friction is heat. Under normal driving drilled rotors will actually hinder your stopping performance because they dont build up enough heat to stop you like they should.

[gsjohnson]

Originally Posted by sstang Drilled rotors are not a good idea on street cars. Rotors are drilled to keep them cooler under hard braking conditions (racing)so they dont get excessively hot...brakes work by friction and friction is heat.

I would have to dissagree. There are numerous cars that come from the factory in stock form with drilled rotors. Ferraris, Lambos, Astons, Porsches & Saleens. My 2001 C4 came from the factory with them. It may not be something a drag racer would be concerned about, but certainly a road racer would. Your decision on the type of pad would be based on the brake temperatures you plan on running.

[mattstang]

quality probably plays a big role now they are coming from some japanese guy drilling the holes with a black and decker. but it does seem them being hot and then you hit a puddle the holes would be a stress riser. i dont think it would lead to catastrophic failure though. seems like they would warp all to hell before they crack.

[mjkids]

i would say drilled and slotted i put them on my car and have no problem the brake stay cooler and stop better

[manOwar]

I'm having a set of Drilled and Sloted made for my GT500 along with Hawk Pads. I don't think you'll see a problem unless your out on a road course or Auto-x every weekend.

[Xantho99]

I just bought my 02 GT, its got drilled rotors, not sloted, is that bad?

[jblood37]

Originally Posted by gsjohnson I would have to dissagree. There are numerous cars that come from the factory in stock form with drilled rotors. Ferraris, Lambos, Astons, Porsches & Saleens. My 2001 C4 came from the factory with them. It may not be something a drag racer would be concerned about, but certainly a road racer would. Your decision on the type of pad would be based on the brake temperatures you plan on running.

+1, every vette I've seen that's 07+ comes stock with them.

[B0B]

Originally Posted by gsjohnson I would have to dissagree. There are numerous cars that come from the factory in stock form with drilled rotors. Ferraris, Lambos, Astons, Porsches & Saleens. My 2001 C4 came from the factory with them. It may not be something a drag racer would be concerned about, but certainly a road racer would. Your decision on the type of pad would be based on the brake temperatures you plan on running.

theres no such thing as a 2001 C4.

[Novanutcase]

My .02!

Slotted rotors are good for heat dissipation but drilled are just prone to cracking. If you look at most major race teams none of them have drilled rotors on their cars. IMO it's mostly for show!

John

[gsjohnson]

Originally Posted by Bob17830 theres no such thing as a 2001 C4.

Would you like to fly down and have me open up my garage so you can take a peak? I can post a pic if you like, but that wouldn't be as much fun. Better yet, are you sure you know what a C4 is?

[B0B]

wow dude, you're confused. you're talking about corvettes right?

my dad happens to own two corvettes, one is a 2002 C5 convertable, the other is a 1969 C3 convertable.

[gsjohnson]

Originally Posted by Bob17830 wow dude, you're confused. you're talking about corvettes right? my dad happens to own two corvettes, one is a 2002 C5 convertable, the other is a 1969 C3 convertable.

Now I see the confusion...I have an 11,000 mile 2001 Porsche Carrera C4. The C4 stands for all wheel drive. Still want that pic? LOL

[B0B]

LOL yeah that sums it up.. sorry bout that!

lets see some pics!

[DanTheMan]

Originally Posted by Novanutcase My .02! Slotted rotors are good for heat dissipation but drilled are just prone to cracking. If you look at most major race teams none of them have drilled rotors on their cars. IMO it's mostly for show! John

+1

[gills99stang]

Originally Posted by Xantho99 I just bought my 02 GT, its got drilled rotors, not sloted, is that bad?

I wouldn't worry about it, and consider yourself lucky because you got some nice rotors with your car!

[gsjohnson]

Originally Posted by Novanutcase My .02! Slotted rotors are good for heat dissipation but drilled are just prone to cracking. If you look at most major race teams none of them have drilled rotors on their cars. IMO it's mostly for show! John

True by todays standards. In the 70s, 80s and into the early 90s race teams strictly used cross drilled rotors. I know my race cars all had cross drilled rotors in the 70s & 80s. They were prone to cracking in the longer races and we practiced changing them for every race. The the practice of chamfering the holes significantly reduced rotor cracking, but it still occurred. The slotting of the rotors was discovered as an alternative without risking rotor failures, but the fact remained that cross drilling was more efficent in reducing brake temperatures. Brake pad materials have evolved significantly over the years and the difference in cooling between cross drilling & sloting has become a non-issue. Either way, I doubt any street car is going to experience rotor cracking of any kind. Besides the holes being chamfered, the holes are spaced farther apart and drilled in a path pattern for durability.

I'll try and post a pick of my C4 over the weekend.