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blk04cobra1
02-09-2005, 02:07 PM
not that my factory one's are bad, just that they look rusted and with the new wheels it looks like crap...just wondering what the best slotted/cross drilled rotors would be to get and also fit with the factory calipers...

flynfink
02-09-2005, 03:00 PM
I have powerslot II, slotted, dimpled and plated. look great.

Need to paint the calipers

blk04cobra1
02-09-2005, 07:26 PM
where'd you get them? those look sweet :thumbsup:

flynfink
02-09-2005, 09:01 PM
tire rack

InfamousSVT
02-09-2005, 09:34 PM
Jeff, did you need anything else to make them go on, or are they just straight replacement upgrades? And, if you don't mind, how much where they?
Will these be ok for track events?

Thanks,

Jason

flynfink
02-09-2005, 10:13 PM
replacements, nothing else needed.

Should be great for HPDE's

InfamousSVT
02-09-2005, 10:21 PM
Thanks, I'll be adding it to my list of things to do!:D

cobrabitn
02-09-2005, 11:59 PM
For open track events....slotted and cross drilled rotors are not recommended. For shows then go with either slotted or cross drilled. My personal preference...solid discs. :)

InfamousSVT
02-10-2005, 12:21 AM
Tony, do you have any recommendations for rotors that I can use daily and at the track?

I know what you're saying about the slotted/cross drilled, they will crack under the heat from open track!

Thanks,

- Jason

cobrabitn
02-10-2005, 12:32 AM
Swapping rotors is as easy as taking a wheel off. I suggest a set for show/street and a set of solids for the track. :thumbsup:

InfamousSVT
02-10-2005, 12:44 AM
Sounds good to me!:thumbsup:

flynfink
02-10-2005, 08:10 AM
For open track events....slotted and cross drilled rotors are not recommended. For shows then go with either slotted or cross drilled. My personal preference...solid discs. :)

They are slotted and dimpled and are recommend for HPDE, but not for racing.

Check your facts, oh great short one.. :thumbsup:

beerkat
02-10-2005, 10:10 AM
Form what little I know about rotors the only time a slot or drilled rotor might be better than a solid is in the rain.:thumbsup:

flynfink
02-10-2005, 11:26 AM
OK, braking 101.

When you hit the brakes, the pad makes contact with the rotor and generates heat, which converts the energy of motion to the energy of heat. In the process, there are gasses that are generated, called "out gasing" (kinda like Tony :thumbsup: ) that must be dissapated. IF not, the gasses can build an insulating layer between the pad and rotor and reduce braking effectiveness. The purpose of slotted/drilled dimpled rotors is to give the gasses a place to go. Racing sports cars have been using them for years and cross drilled rotors are very good. That said, why do most places not recommend them for racing?

1) the drilling does reduce the mass available to dissapate heat so they get hotter. Race teams use temp. sensative paint to determine the highest temp the rotor reached and increase or decrease ducting, etc.

2) The drilling make them more prone to cracking and eventually failure.

3) The number one reason is safety and lawyers. Race teams change rotors every race (or at least floroscope them looking for crack between races). If Tire rack sells you a drilled rotor and you have one fail after the second HPDE and you hurt/kill/maim yourself or others, someone is gonna get sued. Also there is the warranty issue, If a race team has a rotor fail, they're not gonna sue.

Quote from Brembo.

The Brembo Sport discs are premium OEM replacement units that meet or exceed all vehicle manufacturers’ specifications and tolerances. They are fully compatible with stock calipers wheels and other chassis components, easily mounting onto the vehicle. The brake discs are built in high carbon cast iron and they are available either drilled or slotted. The brake discs are then drilled & slotted for a bold, aggressive appearance.

Starting with select castings, Brembo Sport drilled brake rotors undergo the race-born practice of cross drilling & slotting to provide multiple paths to disperse built-up heat and gasses. The Brembo Sport rotor’s cross-drilled holes are bi-angle chamfered at the rotor’s outer surfaces to help prevent cracking caused by repeated, high stress, high temperature brake applications. Brembo Sport drilled brake rotors are sold in axle pairs.

Most sport disc applications are ABE approved, a TÜV certification granted by the German Ministry of Transport. Brembo has obtained this certification due to the wholly-owned and operated integrated foundry and production process that is implemented worldwide.

My motorcycles rotors are crossdrilled too.

flynfink
02-10-2005, 11:50 AM
Here's some more info.

Disc Italia is widely recognized as one of the world’s highest quality racing brake rotor manufacturers. They are made from unique high carbon steel castings which reduce noise, and vibrations caused by the brake system, and are manufactured to the strictest tolerances. There drilled and slotted cast rotors provide a bold, aggressive appearance which complement vehicles running open style wheels. The bi-chamfered holes help prevent stress cracking which occur in lower quality rotors, and improve air circulation throughout the brake disc; this allows for the disc to operate at cooler temperatures than a traditional brake rotor. By keeping the braking area cooler it prevents the pad from being overstressed and from becoming overheated which would ultimately lead to brake fade. The slots channel away water during wet weather driving, and remove any excess carbon deposits from the surface of the brake pads. The end result is a rotor that outperforms and outlasts the competition while providing smooth, consistent braking throughout the life of the rotor. Disc Italia brake rotors are compatible with stock calipers, and pads, and do not require any special modification to install.

cobrabitn
02-10-2005, 09:27 PM
Jeff.... do you have Disc Italia rotors? :doubt:

flynfink
02-10-2005, 10:27 PM
nope, just trying to clear up some brake rotor myths.. :) :thumbsup:

InfamousSVT
02-11-2005, 12:57 AM
This is a quote from Maximum Motorsports, this is what I was refering too with the track racing application:


"Maximum Motorsports recommends Power Slot brake rotors. Gas-slotted rotors provide venting of the hot gases created by your pads during braking, resulting in more efficient braking because the pads are in better contact with the rotors. Gas-slotting may also lessen your chance of warped rotors. We do not recommend cross-drilled rotors in racing applications because cross-drilled cast iron rotors may crack due to the heat from braking."

cobrabitn
02-11-2005, 08:06 AM
They are slotted and dimpled and are recommend for HPDE, but not for racing.

If they are not meant for racing then what are you doing with them on for the street? :rotf:

You guys can run your slotted/crossed drilled rotors all you want but I will say that at several OT events, I have literally seen these things get red hot and crumble. Just let me know when you go on track so I can make sure to be out of the way.

I do agree with MM about the slotted rotors as that make a lot of sense. I'll stick with solid discs...

blk04cobra1
02-11-2005, 08:11 AM
have they gotten that rusty looking color yet? That's the main reason I wanted to swap mine out b/c of the new rims, it just looks horrible

ausie
02-12-2005, 09:48 AM
The rotors may be one key, but the pads are another. If you noticed that racing pads are not solid. They have a groove cut in the center of the pad. This is also another means for out gassing. What may be suitable on the track if you inspect the rotors and pads and have the funds to replace them on a regular basis, then perhaps slotted or drilled rotors may be a good thing but require a higher maintanance practice. The Brembo PBR brakes and rotors on the Cobra are great components. However, if using the same vehicle as a daily driver and for track events, pay attention to the brake components after every race and or before any race. It probably does not matter what rotors you use since they will all get flash rust on them after washing the car. To prevent the hubs from rusting, you could always use caliper paint on the rotor, just do not paint the brake surface as that will damage the pads. There are other types of rotors on the market, but would they be safe for multi-purpose use is questionalbe. Eradi-speed Brembo rotors look sharp but I have my doubts of their use. The hub will not rust on those since they are black anodized aluminum.

sssvtcobra
02-12-2005, 11:43 AM
Blk04cobra1

If your just looking for a good rotor for the street that won't rust check out discbrakes-r-us.com. They sell some rotors that you can get slotted, slotted & cross drilled, or any other combination I believe for a pretty good price. They even offer them zinc plated so that they won't rust. Or you can have them zinc plated yourself. That's what I did. Mine haven't rusted for 1.5 years now. Still have the zinc plating color to them :thumbsup: I wash mine every week when I wash my car. They look virtually brand new like they did when I put them on, they show little signs of being used but not near as much as they normally would.

Just a suggestion

blk04cobra1
02-13-2005, 08:53 AM
thanks :thumbsup: