Cross drilled Rotors?

Originally Posted by steven747

no they dont crack ive had my drileld zimemrmans for 8 months with very very aggressive street driving canyons runs twice a week and a few track days and they are still in great condition zero cracks

I've always used Zimmerman cross drill brakes on my VW's. Now I have a set that is cross drilled and slotted on my 330ci. Never had any issues. They are great rotors. Picked F and R up for 315.

their is a big reason why race cars use drilled and slotted rotors lol. They stop better and have way better cooling which is a lot less pressure on your brakes. It also depends on what brand and kind of rotors they are, as well as your brakes pads.

I have had My Stoptech Rotors RED hot and they are slotted and cross drilled. ive had them so hot that my pads actually caught on fire once. but i have never had them crack Ebay ones will crack good brand names wont

Posts removed...

Back on track please

Enough bickering

bickering...on such a touchy subject...noooooooooooo not on a forum

Originally Posted by PRDesignsTony

their is a big reason why race cars use drilled and slotted rotors lol. They stop better and have way better cooling which is a lot less pressure on your breaks. It also depends on what brand and kind of rotors they are, as well as your break pads.

They don't all use drilled and slotted rotors, and what makes you think the brakes on a race car operate in even remotely comparable conditions to the average street car?

Originally Posted by PRDesignsTony

their is a big reason why race cars use drilled and slotted rotors lol. They stop better and have way better cooling which is a lot less pressure on your breaks. It also depends on what brand and kind of rotors they are, as well as your break pads.

Originally Posted by mkodama

They don't all use drilled and slotted rotors, and what makes you think the brakes on a race car operate in even remotely comparable conditions to the average street car?

Yes, I know not all of them do and the breaks do operate differently then an average street car, however their is still a big reason why they use it. I believe that stopping power is better(My opinion) with cross drilled and slotted rotors. They are able to cool a lot faster. The op said he will be doing a few street races now and than, drilled rotors would go great in certain situations.

Plus, they make your car stand out from the rest.

My .02c .. Drilled rotors look cool.

I wonder what happens when/if one cracks though... I can imagine some pretty violent stuff happening in the brake area.

Originally Posted by Alexotronic

My .02c .. Drilled rotors look cool.

I wonder what happens when/if one cracks though... I can imagine some pretty violent stuff happening in the brake area.

just don't go cheap when it comes to buying brakes and replace them when it's time to.

Originally Posted by PRDesignsTony

Yes, I know not all of them do and the breaks do operate differently then an average street car, however their is still a big reason why they use it. I believe that stopping power is better(My opinion) with cross drilled and slotted rotors. They are able to cool a lot faster. The op said he will be doing a few street races now and than, drilled rotors would go great in certain situations.

Plus, they make your car stand out from the rest.

Ok speed racer.

Mercedes when they first introduced their cars with cross drilled rotors, they had a major recal due to majority of the rotors cracking.

We are talking about Benz here, I highly doubt the recal was due to design flaw. it's just fact that less space equals less traction, therefore less grip and performance, not to mention it eats up your pads faster, causes more brake dust. There was also a study somewhere when Benz recall happened, and according to it, if not drilled and designed properly cross drilled rotors will end up heating furthermore than blanks, poor air flow, same with slotted.

It sure looks cooler, but you don't **** with suspension and the brakes.. Ever..

If I am on a track that requires ton of braking I would go slotted, on street blanks. My car still looks pretty damn good, and I rather not pay extra money to risk rollover or worse.

Originally Posted by doshu

Mercedes when they first introduced their cars with cross drilled rotors, they had a major recal due to majority of the rotors cracking.

We are talking about Benz here, I highly doubt the recal was due to design flaw. it's just a fact that less space equals less traction, therefore less grip and performance, not to mention it eats up your pads faster, causes more brake dust. There was also a study somewhere when Benz recall happened, and according to it, if not drilled and designed properly cross drilled rotors will end up heating furthermore than blanks, poor air flow, same with slotted.

It sure looks cooler, but you don't **** with suspension and the brakes.. Ever..

If I am on a track that requires ton of braking I would go slotted, on street blanks. My car still looks pretty damn good, and I rather not pay extra money to risk rollover or worse.

And I would say your entire argument is invalid since you don't even know high school level physics.

[QUOTE=mkodama;13195281]And I would say your entire argument is invalid since you don't even know high school level physics.[/]

If you want to prove my theory wrong I am all ears, but if you want to change my opinion you will need more than a neeneer reply.

I am open to ideas, and not afraid of being proven wrong.

My wife does that all the time..

Originally Posted by doshu

If you want to prove my theory wrong I am all ears, but if you want to change my opinion you will need more than a neeneer reply.

I am open ideas, and not afraid of being proven wrong.

My wife does that all the time..

Basic equation for friction of non-deformable objects is F=mu*N

F: Force due to friction
mu: coefficient of friction; varies by material
N: normal force, the force "pushing" the two objects together

If you notice, area does not come into this equation at all, which is where a lot of people get it wrong.

EDIT: I was actually just kinda trolling you, but you gave an unexpectedly mature response so I will take the effort to write this stuff out.

Originally Posted by mkodama

Basic equation for friction of non-deformable objects is F=mu*N

F: Force due to friction
mu: coefficient of friction; varies by material
N: normal force, the force "pushing" the two objects together

If you notice, area does not come into this equation at all, which is where a lot of people get it wrong.

Shameless Seinfeld insert..... never gets old

LULZ this thread!

Originally Posted by mkodama

Basic equation for friction of non-deformable objects is F=mu*N

F: Force due to friction
mu: coefficient of friction; varies by material
N: normal force, the force "pushing" the two objects together

If you notice, area does not come into this equation at all, which is where a lot of people get it wrong.

EDIT: I was actually just kinda trolling you, but you gave an unexpectedly mature response so I will take the effort to write this stuff out.

This has always bugged me - if friction is independent of contact area, then why do wider tires grip better than narrow tires? I would think the coefficient itself would vary a bit with the contact area

Same reason why a big brake kit won't show huge improvements over a properly designed oem system in a single 60-0 test. A bbk will have larger rotors for heat reasons, not surface area.

Originally Posted by Andy2108

Same reason why a big brake kit won't show huge improvements over a properly designed oem system in a single 60-0 test. A bbk will have larger rotors for heat reasons, not surface area.

So you're telling me that one can have one car on bicycle tires and another with idk... 255s all around, and that they'd initially perform very similarly? Experience tells me this is not the case.

Also technically a BBK will generate more brake torque than a smaller diameter brake. If one had a set of tires sufficiently sticky so as to not lock up with stock brakes, then a BBK absolutely will improve 60-0 distances. Torque = F*d*sin(theta) (in this case it'd be just f*d since the force is applied perpendicular to the rotor surface).