I Need NEW ROTORS, HELP!!!!!!!!!!!!!!!!!
#47
Lexus Fanatic
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Again, I'm not disagreeing with you. For the third time, I'm saying that slotted or drilled rotors MAY OFFER THE MANUFACTURER MORE OPTIONS with choice of pads, etc. Built correctly, (total mass, spacing/size/number of holes, etc.) Drilled rotors can be just as robust as a blank for a particular application. In other words, a manufacturer can over-build/over-design a drilled rotor to be more than adequate given the specs of the car it will go on.
Besides, do you know for a fact that Ferrari or Mercedes (and whoever else currently offers drilled brake rotors) haven't developed a new material/alloy/compound pad that may offer more mu but produce a lot more gas? Maybe they've developed a new pad composition that offers better heat resistance or less dusting, or better longevity, or all of the above but it just produced a little more gas than they prefer with a blank rotor.
Besides, do you know for a fact that Ferrari or Mercedes (and whoever else currently offers drilled brake rotors) haven't developed a new material/alloy/compound pad that may offer more mu but produce a lot more gas? Maybe they've developed a new pad composition that offers better heat resistance or less dusting, or better longevity, or all of the above but it just produced a little more gas than they prefer with a blank rotor.
If you don't believe me then believe the brake engineer I just quoted to you who has literally written books on brake systems and is a consultant to Stoptech and has worked for several large car makers among others.
No matter how you built a drilled rotor it will be -more- prone to cracking than an equivalent solid one. No matter how you built a drilled rotor it will have a lower heat capacity than an equivalent solid one. It's basic physics.
Here's something telling BTW-
Porsche cars in the showroom have drilled rotors.
Porsche race cars don't
Here's one discussion that mentions it-
http://grassrootsmotorsports.com/for...car/847/page1/
If you want more here's Wildwood:
Q: Why are some rotors drilled or slotted?
A: Rotors are drilled to reduce rotating weight, an issue near and dear to racers searching for ways to minimize unsprung weight. Drilling diminishes a rotor's durability and cooling capacity.
Slots or grooves in rotor faces are partly a carryover from the days of asbestos pads. Asbestos and other organic pads were prone to "glazing" and the slots tended to help "scrape or de-glaze" them. Drilling and slotting rotors has become popular in street applications for their pure aesthetic value. Wilwood has a large selection of drilled and slotted rotors for a wide range of applications.
Or Stoptech:
DRILLED VS SLOTTED ROTORS
For many years most racing rotors were drilled. There were two reasons - the holes gave the "fireband" boundary layer of gasses and particulate matter someplace to go and the edges of the holes gave the pad a better "bite".
Unfortunately the drilled holes also reduced the thermal capacity of the discs and served as very effective "stress raisers" significantly decreasing disc life. Improvements in friction materials have pretty much made the drilled rotor a thing of the past in racing. Most racing rotors currently feature a series of tangential slots or channels that serve the same purpose without the attendant disadvantages.
Last edited by Kurtz; 08-18-08 at 02:05 PM.
#48
Lexus Champion
No matter how you built a drilled rotor it will be -more- prone to cracking than an equivalent solid one. No matter how you built a drilled rotor it will have a lower heat capacity than an equivalent solid one. It's basic physics.
So, Let's sum all of the points that I'm actually arguing in this thread and you're more than welcome to agree/disagree/comment.
1. since we agree that gassing isn't an issue, slotted and/or drilled rotors can help performance by giving dust an avenue of escape between the pad and rotor.
2. Drilled and/or slotted rotors may give the manufacturers some additional flexibility in pad material choice.
3. Drilled/slotted rotors can be overbuilt/overdesigned so that cracking/longevity issues are not an issue for a particular application.
Here's something telling BTW-
Porsche cars in the showroom have drilled rotors.
Porsche race cars don't
Here's one discussion that mentions it-
http://grassrootsmotorsports.com/for...car/847/page1/
Porsche cars in the showroom have drilled rotors.
Porsche race cars don't
Here's one discussion that mentions it-
http://grassrootsmotorsports.com/for...car/847/page1/
Call J Ritt at Stoptech. Ask them about x-drilled rotors. They offer them for the street and show but recommend against them for the track.
Cooling/Thermodynamics argument:
1. a properly vented (internally) rotor will have sufficient flow to disperse the heat without cross drilling.
2. by cross drilling you reduce overall mass and you actually decrease the surface area (needed to dissipate the heat) of the rotors.
Whether you're doing 1 emergency stop or 10, the solid, properly vented rotor will always be cooler than the same rotor that has been cross drilled.
How many F1, Indy, Nascar, etc., race cars have you seen with cross drilled rotors? I haven't.
Have you taken a speed reading course or something. I don't mean this in a negative way. Just curious.
#51
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www.brakeworld.com ! they got some nice BREMBO front rotors for a NICE price! and they got some other brands for the rear...
#54
[QUOTE=350PsDMeuP;3753750]ive heard bad things about lextasy, can anyone vouch for them? in addition, do the 250 and 350 have the same rotor size, but different calipar sizes or whas
stay away from Lextasy.com.....they sell junk and poor cust. service to boot!
stay away from Lextasy.com.....they sell junk and poor cust. service to boot!
#55
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I used EBC stuff on my CBR900 and they sucked compared to the OEM honda pads. I used EBC on the integra and they sucked also compare to the OEM. I said the hell with it and stuck with OEM.
The Is350 is on OEM high dust pads and I love them. I hate the lack of COF from the low dust pads so I don't use them.
The OEM rotors are a soft material. I think Racing Brake.com makes great rotors. They are used on several NSXs and are 2-pc and lighter. They are about $650/pair but are well worth the upgrade for a rotor that doesn't show a lot of wear and will last longer.
The Is350 is on OEM high dust pads and I love them. I hate the lack of COF from the low dust pads so I don't use them.
The OEM rotors are a soft material. I think Racing Brake.com makes great rotors. They are used on several NSXs and are 2-pc and lighter. They are about $650/pair but are well worth the upgrade for a rotor that doesn't show a lot of wear and will last longer.
#57
Lexus Champion
iTrader: (1)
The OEM rotors are a soft material. I think Racing Brake.com makes great rotors. They are used on several NSXs and are 2-pc and lighter. They are about $650/pair but are well worth the upgrade for a rotor that doesn't show a lot of wear and will last longer.
#58
Lexus Fanatic
iTrader: (21)
What ever you guys do, DO NOT BUY FROM BSIBRAKES they're the most F'd up company ever!!!! I repeat DO NOT buy from them. I bought rotors from them since Feb. still haven't seen anything, I got them to refund me the money after 2months of trying and still nothing. Now they won't even pick up my phone calls!!! I left message after message and they won't call me back.....F!@k I'm so pissed....
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