Okay so a friend of mine is getting new rotors for his camaro and he wants to get new drilled and slotted rotors, but i said i was unsure if there were really any benifits to getting rotors drilled and slotted.

From what i understand is that drilling
- does not help with dissipating heat like advertised
- will get hotter under hard braking
- is at greater risk of warping
- is subect to cracking
- does help with venting off-gassing

slotted
- scrapes the glazing off the pad
- clears brake dust
- will get hotter under hard braking

venting seems to be the only (extra) thing on a brake that makes a difference in cooling.

Other thoughts of mine are that a larger amount of steel in the rotor will take longer to heat up then a drilled/slotted rotor but will also take longer to cool down given in reaches the same temp that a drilled/ slotted rotor.

Can anyone confirm or deny any of this?

 

anyone?

 

slotted is all you need, drilling is FTL, to easy to crack, if anything, slotted and dimpled is what'd i'd do

 

i dont know much you can use this, but i had slotted and drilled on a civic i had. I had the rotors on the car for five years. I did everything from cruises to 0-100-0 runs. I never saw much in the way of fade during braking. i never saw any cracking on the drilled holes.

From what i read is that drilled or slotted are better if you are doing autox's or something similar. drilled and slotted are best for show cars, I think that for what your asking about slotted might be best.

 

bump

 

my friend road races with his vette and he tried drilled and slotted rotors. pulled them off, microcracking like crazy

 

Yeah im pretty sure that blank vented rotors are the best. Did you friend notice any performance upgrade?

 

drilled rotors will crack with a lot of heat. drilling holes right through them creates stress points. a slotted or dimpled rotor wont do that. a slotted rotor will keep the pads clean and help remove gasses that the pads release when they hit the rotor giving you a more consistent and better brake feel. a slotted or drilled rotor wont do much for brake temps.

fwiw, on my old cavalier i did notice a good difference in brake consistency with powerslot rotors.

 

no he didnt notice any upgrade in performance whatsoever. he warrantied them so he could get a free set of rotors lol

 

I think it comes down to the quality of the steel. I have seen some crack and other last forever. My brother has Baer cross drilled/slotted on his blown 02 mustang gt. Never had a problem going on 4 years....it was his DD for 3 of those years, now he has a jeep.

 

Truth

 

Anyone with any other opinions. Im looking to confirm of deny what i said in my first posts. I want to know specifics.

 

to be honest, i've never heard of problems with slotted rotors. i guess you could search the net and find people's experiences with each set up and draw your own conclusion

 

im not looking to see if people have problems, im just looking for the performance advantages if any of going with drilled and slotted.

 

no...none...

slotted as you said cleans the pads, helps gasses escape, and increases the surface area so it actually can dissipate heat better.

 

No need to drill. Slotted helps remove heat and gas. That's all you need.

 

I am looking for some input on this aswell. I've been debating between the DBA slotted rotors and the GMPP drilled and slotted rotor.

 

From my understanding:
If the rotors are drilled correctly (actually molded into the rotor, not drilled) as you see on stock porsches, ferraris and the lot, they are there mostly to reduce unsprung weight, not much else for performance though.

If you are looking at aftermarket drilled rotors that are not over a couple grand for a set they are likely drilled, which does produce stress points which make the disc weaker and prone to cracking. For me, this means the negative far outweighs the good on cheap drilled rotors. If you are only a show car it could look good, but given any extensive aggressive braking I would not trust them (although some ppl have had no problems).

I have not heard any real negatives to the slotting processes used, but I am sure there is something. I have had the Stoptech slotted rotors on for the last few weeks and there is no dust from the HPS pads, and they seem not to hold heat too much.

The main thing you can do for performance is to enlarge the rotor, giving a larger heat dissipation ability in extended aggressive braking. Im sure others can give some more pros to this option as well.

 

mostly true...those brakes you see on ferraris and porsches and the ZR-1 are a completely different kind of material also....

also on your enlarging the rotor....it does allow for more surface area...and if you can mount the caliper out a little farther it will create more braking torque...

 

Theres no comparison, DBA slotted all the way.

 

DBA makes very good slotted rotors.

Keep in mind most companies that have Slotted and Cross Drilled have standard warranties to cover cracking.

I have sold both to various customers.

Typically in the northern/colder areas usually go with Slotted or Slotted and diamond cut, southern warmer areas cross drilled and slotted or diamond slotted.

And as always Hawk pads

 

Maybe a little something like this:




Or even this could be fun:

 

^^^ I LOVE YOU.... lol