nocab72

Just received my set front/rear of Brembo Rotors from the RX7 store. When I ordered them Jason told me that whomever does their/his machining no longer does drilled, only dimpled. I assume this helps reduce cracking?

Anyways, they still look great! Here are some pics I took last night off the car. More pics to come when I get them on.

http://flathat.woodstream.net/RX7/Brembo_Rotors/

BTW: my gf loves it when I take pictures of my new car parts on the dining room table...

K

zyounker

yeah, that has been the recent trend.. no more X-drilled rotors..

Only Sloted & dimpled...


-Zach

SleepR1

All you're doing is taking out more of the heat sinking iron, and reducing heat transfer capacity. If you're into looks and not worried about track performance, I guess these are ok, but these dimpled slotted rotors won't do much for you...well they might help slightly in the rain...

zyounker

Actually they do help.. But really only on the track. The let gasses escape off the pads through the groves & let the pad work better.

Same thing with X-Drilled.. People are moving to slotted rotors becuase they are more durable with the same benifits as X-Drilled..


-Zach

0piston

iTrader: (9)

Looks like they copied the EBCs

SleepR1

After trying EBC Red Stuff and seeing how bad these pads were on the track, I don't have any faith in EBC's products...

1bad7

dimpled rotors??? thats one of the dumbest things that ive ever seen

so now youve decreased the surface area of the rotor even further without being able to dissipate heat any better. the grooves already expell gases so the dimples dont do anything more than reduce the pads contact area with the rotor.

this is what i'd expect from a civic and not from an rx7

shame on you

phatmonky

Can you show me that just slotted will stop faster, fade less, and float just as little when hot??

SleepR1

Awh, I imagine Kyle likes the look of dimples and slots, and the purchase has little to do with actual performance

zyounker

um, yeah kinda like the RX-8?????

I would hope mazda knows that those dimples don't work.. maybe you should email them.. looks like they are makeing a big mistake



-Zach

1bad7

i personally cant but alot of people on this forum who autocross and track alot can definately tell you so

1bad7

haha, u gotta be kidding me right. do u think mazda ever intended for those brakes to go into production? those r just for show and were never intended to actually be used. its just like saying that mazda thinks 18 inch rims are the best performing just because they have them on that show car eh? they'll increase handling and grip over 16 and 17 inchers right?

gimme a break

look at the brakes on the rx-8 in this months road and track. r they drilled and slotted? i didnt think so

thanks for coming out though

i dont care what u want to buy for your rx7, im just saying that it isnt viable or effective.

SleepR1

Yeah those are for looks.

Right now the best productions brakes are on the Porsche 996 Turbo. I believe they are exotic carbon brake rotors and pads. $10,000 option, I think. If I recall they were solid faced rotors...?

jumprdude

Wouldn't that instead be the Porsche 996 GT2 brakes with ceramic rotors?

Talk about being able to stand up to the heat.

zyounker

SleepR1: well carbon or ceramic disks/pads would be optimal.. and you would not want them to be X-drilled.


As for just looks, i disagree. I have seen various manufactures come out with setups like this. so i doubt it is just for show.. especially when the no longer carry X-drilled rotors..

And further more, did it occur that cars in auto shows have every option that the engineers would love to put on a car.. but when they make it production ready, they have to cut alot of corners to make it meet expected costs???



-Zach

zyounker

ok, upon looking at some of the other rotors out there.. i realized that most are x-drilled & slotted.. not "dimpled"

So, why would they not just drill through??? it doesn't make sense.. I would assume it has some benifit.. but i don't know.




-Zach

1bad7

concept cars r built to grab your attention... fancy brakes, huge rims and funky designs attract attention. it has very little to do with the actual performance of the car. its only designed to guage peoples interest.

now crossdrilled and slotted rotors do look pretty cool but many of them do not aid in braking, they rather impede it. the only way that you will get an improvement in a crossdrilled and slotted rotor is if it was designed that way from the manufacturer, is much larger than stock in diameter and comes with a caliper that accomodates a much larger brake pad. this way you get good gas evacuation, better heat dissipation as well as minimizing contact surface loss. they sometimes even increase it even though they're x-drilled and slotted through use of a much larger pad and rotor. all these factors come into account only when your willing to spend alot of money on an entire brake upgrade such as the brembo big brake kit which i currently am running.

these rotors that we r currently speaking of r particularily faulty due to the fact that they do not come x-drilled and slotted from brembo. a third party does this process. do u know why they're no longer offered in x drilled but dimpled now?... its because all the rotors were cracking. this happens because the drilling is done after a special coating and treatment is applied to the rotor from the factory. drilling them after only weakens them. when a factory decides to x-drill they do it first and then apply the coating and treatment to ensure both durability and longevity. im not sure about the durability of these dimpled ones but those r the facts.

sorry about the long post

martini

Here are some pictures of my new brakes:

http://www.fatboyraceworks.com/~ndahl/brakes/

Those are EBC rotors. They are "cross pitted" and "sport slotted" (not machined all the way through).

Would you believe they have a warranty? But only if you use EBC pads, of course.

SleepR1

Yeah I priced these at Tire Rack...EXPENSIVE!

DamonB

Oh god, here we go again. Please go and read this thread: why rotors are slotted

FavBandDMB

Can I get Brembo rotors that are only slotted at the factory? Or do they come solid-faced only?

1bad7

yes you can. brembo offers either slotted OR crossdrilled rotors but not both on the same rotor. these rotors come with a cadmium coating that resists rusting.

nocab72

SleepR1 - actually I do like the look of the dimples & slots and since I'm street use only for now, I think these rotors w/the Hawk pads you recommended for my first few track events (HP+ pads in front and HPS pads in rear) I'll have plenty of street stopping power and hopefully no cracking.

When you get me on the track, I'll swap back out to the stock rotors if I get nervous about cracking since they only have 30k miles on them.

K

SleepR1

Kyle,

I imagine the EBC rotors will be fine out on the track with HP Plusses. The dimples shouldn't crack at all...

Try to get in on the Porsche CIR PCA Drivers Ed at Putnam Park Apr 27/28. It's a good deal, and the in-car instructors are great! I know of one particular FD Rx7 owner who will be an instructor during this event--HINT--he's the moderator of this forum...

See ya at the track!

M5150

ceramic brakes will never be on the street, porsche never came out with that option beacuse of what i recall to be "catistrophic brake failure", and as for xdrilled, ever noticed how its lined up with the ventilation? its so heat can escape that way, and as for the slot, its to take off glazing, o and another thing, brakes dont gas anymore