I am planning on getting new two front rotors for my ls and I was debating,on whether I should get slotted, drilled or both? Thanx

 

For street ,Drag ,Or road race?Theres alot of differnt uses?

 

something for a daily driven vehicle, something that will help me stop well and won't f*ck ulp.

 

theres no point, save some money and buy solid ones, you dont ever see any real race cars with slotted or cross drilled rotors, its only a style thing, save money, bigger and solid....imo

 

race cars have crazy twin caliper brakes, carbon fibre composite rotors 'n other super expensive things.

slotted discs have advantages... cross drilling is meant to be for weight.
i've heard that slotted discs are the best for heavy use on street cars. i've had my cross drilled and slotted rotors heat up to the point where they are glowing red several times. i was told by some brake expert that i should have gone for slotted rotors.

 

If you're only using them for street performance then you might as well just get some decent solid rotors. As for cross drilled, they are not only for show. As mentioned previously, they are lighter but they also will run cooler on the track. The purpose of the slots or drilled holes in the rotor is to let the gas buildup between the rotor and pad escape more efficiently. I've heard that cross drilled rotors tend to crack more than slotted on the track but don't know for sure...a lot of it depends on the driver and whether he/she is braking properly.


[Modified by kmurph, 3:25 PM 3/20/2003]

 

Okay first off unsprung mass is not the goal of anything that comes to rotors in terms of cross drilling and slotting.

Cross drilled rotors - main reason if for pad degassing and cooling. When you use a more abbrasive pad there are gasses that build up between the rotor and the pad. These, over time will cause a film to develop almost like wax and cause some very nasty brake fade. This is refered to as "green fade". With a well designed cross drilled rotor it will cuase a vacuum between the rotor and the pad and literally evacuate all of the gasses and provide moderate cooling to the brake system. I am not talking about "power stop" or some other cheap, shitty rotor - I am talking about casted cross drilled rotors. Some casted rotors would be Alcon, Mov-it, Brembo and Stop-Tech.

Slotting provieds a similar degassing ability although not quite as effective. The rotor is however slightly stronger than a cross drilled piece. Even when you have a cast rotor (opposed to post drilling/slotting) they still can crack. The slotted is a better choice for endurace racing. It also helps prevent the resedue left from the gas buildup on the pads.

Unless you want to spend the bling bling on high end brakes, stick to the factory rotors. If you want better performance brake w/o the price, go buy a set of Hawk Blue brake pads.

 

like everyone said, for daily driven car it's worth putting them in. But it does look nice on cars with rims that let you see them. I was gonna put them on my car (stock warped) mostlyfor their looks. It's a matter of personal preferences.

 

of those choices you would be better off with slotted. reduces brake fade but only if you brake really hard.

 

Slotted are less likely to crack so if you are going to do something on a daily driver, slotted is the way to go IMO.

 

one can get a set of F&R drilled slotted Brembo rotrs and Axxis ceramic pads for $265...at that price why not, plus most aftermarket drilled slotted's are plated to prevent rusting which looks a whole hell of a lot nicer than rusted rotors and will help keep the rotor from rusting itself to the wheel...which has happened to me before

 

thankz for the feedback guys, I think Ill go with the slotted rotors since Im broke as hell right now

 

get neither.

 

junglistgsr is correct. I will reword what I said before, go with a good solid rotor... Do you want to spend a couple hundred on a Alcon rotor if your broke? I'm not talking about the cheap 25 dollar "power slots"

 

just go for solid Brembo blanks, they're cheap & they won't crack on you like the Drilled/Slotted rotors you see on eBay. Check groupbuycenter for the blanks, I think $30 a piece.

BTW, those brembo drilled/slotted on eBay are just Brembo blanks that another company has machined. So instead of it be casted in the drilled/slotted mold it was a blank that someone took a machine to. Less structural integrity.

 

first, for that $265 and $10 and I got ITR spec front rotors and calipers. The plated rotors will still rust even on the part that doesnt get touched by the pad and especially on the part where the pad touches like when you wash your car. for that money that you spent wasting on getting some junk "bling" rotors that arent very functional and eat pads faster....you couldve had better brakes like mine

 

Run slotteds up front and solids out back.

 

I had slotted/drilled Racambi on front and stock in back.
I'm building an IT car now so I had get rid of the slotted/drilled and went back to blanks in the front.

Guess what?? I like the blanks better!! I bought the Raysbestos from Pep Boys.
Anyone want 1/2 used Racambi slotted/drilled fronts? $25 for both!!





[Modified by gsirnj, 4:07 PM 3/20/2003]

 

i got a better plan, solids up front and solids in the back. works better, is cheaper.

 

clearly you're not following the feedback. stick with blanks.

 

Are you aware that drilled rotors pose a saftey risk??

The extra mass and structural integrity of a solid rotor is more important that the bling and any other advantages there might be to ghey cross drilled rotors. Ask Drew M about cross drilled rotors or perhaps someone ca give these people a link to the Nissan Altima site with that thirty page thread.

 

No it's not, the holes are designed to help gas escape.

 

No, its for looks. Modern brake pad compounds do not outgas like they used to. The holes serve absolutely zero purpose other than appearances. The rotors on porsche were designed soley for improved wet braking. The holes also provide a very convenient stress point for fractures and spider cracking to occur.

 

Just think of it...the more surface area the more the pads have to come in contact with, take a look at F-1, JGTC or any other super high performance cars, they all have solid rotors, save some money, BIG SOLID ROTORS

 

It has nothing to do with surface area. It has to do with mass. A rotor thats at the lower end of its service limit for thickness will fail a very quick, horrible death on track. Same thing with slotted/drilled rotors.