As the topic says, is there any down side to having cross drilled, and/or slotted rear rotos.

I have EBC's in the front, but i love the look of them so i want a set for the rear, s long as there are no downsides then i will go with them.

 

um.. no.. no downside.. other than you won't notice much braking improvement (if any).. but your pads will last longer

 

I was more worried about them adding too much stoping power and wanting to lock up, then i would avoid them.

This will be one of the few pieces on the car that i will put on for looks. SO if i dont gain anything, but at the same time I dont loose anything. Well that will be just fine with me

 

drilling/slotting does not increase brake torque (ie stopping power)

 

nope

 

the drilling and sloting is to allow cooler air to circulate thru the rotor to draw heat away from it to prevent cracking and warping. the slots also cut the pad to de-glaze them from high heat from track use or mountain use. since the slots and drills cut the pad its said that they grab/bit the pad better increasing stopping power but that is only in theory since the shorter brakeing distances are due to the fact or the rotor beening cooler and able to disapate the heat away faster which prevents fade

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">drilling/slotting does not increase brake torque (ie stopping power)</TD></TR></TABLE>

Actually they do, but only once the disc get really hot, the slot/holes allow the hot hot gasses that are produced by the organic materials in the pads, when heated to extrem temps, escape. These gasses will reduce the amount of friction the pads can produce, but on a stock brake system you will not notice a difference. On a high performance system such as Brembos, at the track after repeated high speed laps you would notice a difference.

 

Current brake technology allows the creation of pads that don't off-gas. (ie: abspestous pads did)

Drilling was originally designed to deal with off-gassing yes, but they are no longer needed.

 

Rear brakes don't really do much in stopping the car, fronts do most of the work, yet they do help in every way possible. By going with slotted/drilled rotors in general you will loose stoping performance, moving brake bias towards the front, thus making fronts do much more work than they are designed for.

You basically loose surface area for the pads to bite to. Save money and buy blanks and keep your stopping power

 

Does anyone agree with the noob above??

I dont agree with the loss of power due to a loss of surface area. The cooling and anti glazing affet will far out weigh the loss of any surface.
But if you do loos any power would you shift more of the bias to the front and therefore make the front due too much work??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">Current brake technology allows the creation of pads that don't off-gas. (ie: abspestous pads did)

Drilling was originally designed to deal with off-gassing yes, but they are no longer needed.</TD></TR></TABLE>

yeah I agree but you gotta wonder why Porsches, Ferraris, and Lamborghini have them in the first place. besides bling factor what else?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Racermech &raquo;</TD></TR><TR><TD CLASS="quote">Does anyone agree with the noob above??
</TD></TR></TABLE>&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt; Seems like ............

 

I have Brembo Sport cross drilled rotors for the front and I love em. They never rust, and they look great. I also felt a big difference in breaking, but I also bought the car with warped rotors heheh.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by martinez32 &raquo;</TD></TR><TR><TD CLASS="quote"> By going with slotted/drilled rotors in general you will loose stoping performance, moving brake bias towards the front, thus making fronts do much more work than they are designed for.

You basically loose surface area for the pads to bite to. Save money and buy blanks and keep your stopping power</TD></TR></TABLE>

ummm.....I don't agree with that statement. Along with pads and steel braided lines, I gained stopping performance. I did not lose any. In fact, several times, they've saved me from rear ending people who like to step on their brakes for no apparent reason....where as without them, I'm damned sure I woulda lost my front end.


Please explain your position a little better. I couldn't make any sense out of your post.

 

You probably won't get any noticible gains for everyday driving. However, if you normally autocross/road-race for extended periods of time, they would be a good investment. If you're just going for bling factor, it's up to you. You will not notice any difference for daily driving. If I had the money to put slotted/drilled rotors in the back, I would probably spend the money on something that gave performance gains. Or you could put the money away for when you really need brake rotors, not when you want them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GDJ &raquo;</TD></TR><TR><TD CLASS="quote">You probably won't get any noticible gains for everyday driving. However, if you normally autocross/road-race for extended periods of time, they would be a good investment. If you're just going for bling factor, it's up to you. You will not notice any difference for daily driving. If I had the money to put slotted/drilled rotors in the back, I would probably spend the money on something that gave performance gains. Or you could put the money away for when you really need brake rotors, not when you want them.</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Racermech &raquo;</TD></TR><TR><TD CLASS="quote">
I dont agree with the loss of power due to a loss of surface area. The cooling and anti glazing affet will far out weigh the loss of any surface.
</TD></TR></TABLE>

There is almost no cooling benifit to drilled rotors. Slotting does help prevent glazing, however rarley necissary.

The reduction in swept area doesn't effect stopping performance, but the reduction of mass and thus thermal storage will. If your rotor can't store any more heat, your not going to stop.

I have heated up my blanks to the point of blood red on the track before, I will take all the storage I can get.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
you gotta wonder why Porsches, Ferraris, and Lamborghini have them in the first place. besides bling factor what else?
</TD></TR></TABLE>

More bling. Sure ferrari, lambo's, and porsches do great at the track.. they are not designed for people who take them to the track.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
Along with pads and steel braided lines, I gained stopping performance.
</TD></TR></TABLE>

The only gains you saw in stopping power were from the brake pads. Drilled/slotted rotors and stainless lines don't increase stopping power.

Come on people, scientific method. If you change 3 things, how can you attribute any change to one thing?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
However, if you normally autocross/road-race for extended periods of time, they would be a good investment.
</TD></TR></TABLE>

AutoX uses almost no brakes, certinly not enough to heat them up where you would consider heat being an issue. And see above for road-racing.

 

to styleteg, this fool knows his ****

 

Replacing your pads would be of a greater benefit.

 

i've seen a couple people that have gotten the drilled/slotted rotors and they cracked....i was thinking that maybe they're weaker bc of less braking surface?
.....i agree with everything StyleTEG said....i dont think they are needed, and i'd rather take more braking surface/mass and thermal storage like he was explaining.

 

[QUOTE=StyleTEG]

There is almost no cooling benifit to drilled rotors. Slotting does help prevent glazing, however rarley necissary.

QUOTE]

I dont agree, cause my dad has a digital laser temp gun and I tested my oem to the brembo cross drilled and noticed that it was on average 50'-100' cooler if i recall correctly

 

[QUOTE=StyleTEG]More bling. Sure ferrari, lambo's, and porsches do great at the track.. they are not designed for people who take them to the track.QUOTE]

I beg to differ, most of the design philosophy of these cars comes from the racing experience that those companies have.

 

Well i am not just chaning them for the bling factor. I bought the car used back in 99. The first thing i did was pull the wheels and check the pads. The fronts where pretty worn so i tossed them and just put some basic pads in. However the rears looked good so i left them in.

Now the front rotors are warped, so they are getting replaced with some EBC pads and rotors. At the same time i would like to replace the rear brake combo. Now replacing the rears with drilled/slotted will be for bling, but they are due to be changed.

 

id stick with the solid rotors DBA an Austalian company is really good.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbo01LS &raquo;</TD></TR><TR><TD CLASS="quote">
I beg to differ, most of the design philosophy of these cars comes from the racing experience that those companies have.</TD></TR></TABLE>

Yes, some of it.. but they are still catering to the midlife crisis overly rich market.

They don't have a roll cage, they have full interior, they have leather seats, what else do you need to know?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
I dont agree, cause my dad has a digital laser temp gun and I tested my oem to the brembo cross drilled and noticed that it was on average 50'-100' cooler if i recall correctly
</TD></TR></TABLE>

lol, that's Bullshit.