Everyone believes drilled rotors are better than solid rotors

[RayK]

The cobra setup is the way to go. It comes with pads, but I wasn't impressed with the pads and upgraded them.

If you need an upgraded master cylinder, you can have Sweet do it.

Upgrade the pads in the back also. I had stock pads in the back and they were down to the thickness of a sheet of paper in a day at the track. I had to pump the pedal to get some brakes.

[RayK]

"Slotted discs are generally not used on standard vehicles because they quickly wear down brake pads; however, this removal of material is beneficial to race vehicles since it keeps the pads soft and avoids vitrification of their surfaces."

Vitrification is a process of converting a material into a glass-like amorphous solid which is free of any crystalline structure, either by the quick removal or addition of heat, or by mixing with an additive. Solidification of a vitreous solid occurs at the glass transition temperature (which is lower than melting temperature, Tm, due to supercooling).

rotating mass (less) is another benefit.

But those are street pads. Mettalic race pads are fricking hard and take heat to really start to work. The pads don't wear much, but the damn rotors do.

[Steve]

do you know if that includes the conversion braket and the new master cylinder. according to the ford racing website i need both to convert my year to the cobra setup

I think they are referring to the Bracket that the caliper clips into with the caliper pin. It will come with new calipers. At least me new ones and Scot's new ones came with them. As for MC and spindle, I have 1995 Junkyard parts on my car. Not sure why a different MC would be used, the volume is there and my car has great pedal feel.


Go buy the kit Nick is suggesting from Tousley, good price and you'll be amazed of the difference. And as stated before, if this isn't enough brake for you you can always get more aggressive pads. Ultimatley it's your tires that limit your braking so I don't think this will be too much brake for your car.


S40- Those Brembo Blanks I was referring to ARE OEM REPLACEMENTS FOR 94-04 COBRAS.

[Sleeper]

The only surface area that counts is what the pads are using. If you drill the shit out of a rotor, your creating stress points and reducing pad surface area.

Rotors can be red hot and work with track pads.

i wasnt talking about pad contact area, i was talking about actual surface area of the rotor which contributes to cooling. and no thats not the only surface area that counts. its a tradeoff. and stress points are nearly eliminated with chamfering. yes, i have seen them crack...but ive also seen blank oem rotors crack.

have we all come to an answer on what is the best style rotor yet?

[ScotWithOne_t]

i wasnt talking about pad contact area, i was talking about actual surface area of the rotor which contributes to cooling. and no thats not the only surface area that counts. its a tradeoff. and stress points are nearly eliminated with chamfering. yes, i have seen them crack...but ive also seen blank oem rotors crack.

Chamfering may reduce the propensity for cracking, but not very much. Even cast in place holes will crack. I have seen some Porsche rotors that hare cast in place, and each holes is set about halfway into the cooling vanes, thereby reinforcing the hole on the ends, but that is a highly specialized, very expensive rotor.

have we all come to an answer on what is the best style rotor yet?

Yes. We knew this long before this thread was created. The answer is a high quality blank, such as Brembo's.

I have not done any research to see if there is anything to those "Frozen" rotors. My guess is that those are just marketing hype.

[Sleeper]

Yes. We knew this long before this thread was created. The answer is a high quality blank, such as Brembo's.

then a good way to educate those who dont know is to start the topic the way this one was started.

[ScotWithOne_t]

then a good way to educate those who dont know is to start the topic the way this one was started.

I never meant that it was a bad topic. You asked if it the question had been resolved, and the answer is yes, it has already been resolved many times over.

[Outrun]

You do not need to replace the Master Cylinder. The stock cobra’s in 94/95 had a bore of 15/16, which is 0.9375. The 94-95 V6/GT has a 1/1/16 bore, which is 1.0625. You want to be as close to a 1.00 inch bore as possible. I wouldn’t split hairs. Yours is close enough…unless you want to try to find a Cobra MC. Think they’re pretty hard to find if I remember correctly. If you go much bigger than 1/1/16, not that you would, but the pedal will be like stepping on concrete…very hard. If you do find a Cobra MC, you will get a softer pedal. Stick with what you have. If you don’t like it, then switch it out. My 2 cents.

[S40Monster]

S40- Those Brembo Blanks I was referring to ARE OEM REPLACEMENTS FOR 94-04 COBRAS.

I know that, but Cobras aren't exactly a budget brake system. If the OEM system is suitable for the track then obviously OEM blanks are capable of track abuse as are slotted and drilled rotors regardless of Tire Rack's umbrella statement.

Directly from Brembo.
"What are the advantages of drilled and slotted discs?

The main advantages of drilled and slotted discs are the same: increased brake "bite", and a continuous refreshing of the brake pad surface. Drilled discs have the additional advantage of being lighter and running cooler. However, there are certain pad materials that should not be used with a drilled disc."

Take my car for example I'm running Brembo slotted rotors on the front, not because I wanted slotted rotors but because they were cheaper then blanks, I'm replacing my rear rotors this week with Brembo blanks because this time around they're cheaper then the slotted. Now I wouldn't AutoX my S40, but it isn't because of the slotted front rotors it's because of the inadequate 4dr sedan made for soccer moms braking system like is installed in ~95% of vehicles. This is the message Tire Rack was trying to make, just because I may have slotted rotors doesn't mean I should expect racecaresque braking performance.

It would be like if they sold OEM spoilers, and had a statement like "OEM spoilers do not significantly increase downforce and are not intended for track use." Now just to make a point lets say they sold replacement spoilers for Saleen S7's. Obviously an S7 spoiler does significantly increase downforce and is suitable for the track, but they make the statement anyways because ~95% of their sales would be to Celica owners putting on the GT-S spoiler or Taurus owners putting on a SHO spoiler, etc.

[Steve]

How can you make that conclusion? An OEM blank rotor and an OEM replacement crossdrilled rotor are completely different. Brembo makes the slotted and drilled rotors by cutting their blanks. This creates stress risers and increases potential of cracking after heat cycling, more so with drilled rotors rather than slotted rotors. Slotted rotors are for cleaning the pads and are totally different than drilled rotors. You are clouding the issue.

I am not going to repeat things we have already discussed in this thread. Go read the thread if you want to. You just need to understand one thing. Crossdrilled rotors will crack and explode into pieces if not replaced once cracked. They have cracked under street conditions and Tire Rack says not to use cross drilled rotors on the track.

I am not interested in going off on your tangent.

[S40Monster]

Brembo: The Brembo Sport discs are premium OEM replacement units that meet or exceed all vehicle manufacturers’ specifications and tolerances.

[Steve]

Your point? Tire Rack also goes on to say that drilled and slotted ones are not recommended for track use.

What is a spec? Dimensional? Material? I would say a crosee drilled rotor does not meet OEM specs since it has holes in it that weren't specified from the original factory print.

[HAULNSS]

Now I wouldn't AutoX my S40, but it isn't because of the slotted front rotors it's because of the inadequate 4dr sedan made for soccer moms braking system like is installed in ~95% of vehicles. This is the message Tire Rack was trying to make, just because I may have slotted rotors doesn't mean I should expect racecaresque braking performance.

Pfftt. Who would be silly enough to auto-X or open track a four door grocery getter? The brakes wouldn't last one lap, I bet.



Randy

[Steve]

Notice how the people that have a hard time swallowing this info have never been on track?


Let 'em run a few days and fade the brakes, blue their rotors and smell the pads burning. I don't think they know how hard we push the brakes.

[S40Monster]

Your point? Tire Rack also goes on to say that drilled and slotted ones are not recommended for track use.

Really? I had almost forgotten what the all knowing Gods of Tire Rack had to say. It's a good thing you brought it up for the upteenthmillion time.

What is a spec? Dimensional? Material? I would say a crosee drilled rotor does not meet OEM specs since it has holes in it that weren't specified from the original factory print.

Specs don't typically state how a product has to look, they state how a product has to function. I wonder if Tire Rack sells OEM replacement rotors for the Ford GT. Do you think they're suitable for the race track?

Pfftt. Who would be silly enough to auto-X or open track a four door grocery getter? The brakes wouldn't last one lap, I bet.



Randy

Don't you have Wilwood's on all four corners?