Rz/rs Front And Rear Big Brake Gb - 2 Piece Rotors
08-26-2003, 07:26 PM
#21
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Join Date: Jan 2002
Location: Texas
Posts: 49
Oh, and if nobody can get me measurements on the RS/RZ front calipers as far as clearance of the 16" wheels - to determine if wheel spacers will allow the use of the stock 16" wheels for those that want to keep this option - I'll order the front calipers this next couple of days and test fit.
08-27-2003, 02:23 AM
#22
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Join Date: Jan 2002
Location: Texas
Posts: 49
In compliance with the admins wishes, I cannot promote the caliper GB in this thread. Nopistons has my deepest gratitude for allowing continued discussion about the rotor GB. Any caliper related questions, please contact me on the other forum (same user name:dclin), or check the thread 'Spirit R brakes' in the Suspension/Wheels/Brake section of the other forum. A GB post covering all aspects of the GB will be up over there soon.
Regarding the rotors, another aspect of of the 2 piece design is that it allows one to replace just the rotor part of the brake rotor, which *may* result in savings, and/or allow you to use the replacement brand/model rotor of your choice.
Before going on though - in this post, my use of 'rotor' refers to the rotor part of the 2 piece rotor, and 'hat' refers to the machined hat of the assembly. (duh
).
Replacement rotors will be available from Precision for roughly $150/rotor. You do have other brands and models to choose from, though, and may be worth considering if you do alot of track events (and go thru rotors often). One of my requirements for the 2-piece rotors is that it uses a universal bolt pattern (to attach the rotor to the hat). This way, you are not required to buy Precision rotors if should want to use something else.
There are considerations though, so please read carefully:
There are a number of companies that make universal replacement rotors for 2 piece brake rotors, including www.wilwood.com , www.colemanracing.com , www.apracing.com and others.
However - with the exception of AP rotors (for the front rotors, not the rear) - nobody makes a replacement rotor that is the exact diameter of the RZ/RS spec rotors, which is 12.36". The closest 'standard' rotor is 12.19" .
What this means is that - should you choose to replace your rotor with a 12.19" rotor - the brake pad will 'hang over' the rotor by about 3mm or so. There is debate as to whether this makes any difference, with the brake vendor (obviously) not recommending you do so, and at least one track guy saying that he has not had any problems with his Mandeville front brakes (which has its brake pads overhang the rotor by a little bit). Another suggestion is to simply trim the excess brake pad.
The official word is that this is NOT recommended, and you do so at your own risk. We are all adults though (or at least most of us hehe), and this option is left open to you (by employing the universal bolt pattern) and your performance shop's judgement. Brakes are serious business though, and use professional judgement to decide what is better for your application. Again, do so at your own risk.
Why would you consider using a 12.19" standard rotor? Price - a Wilwood standard straight vane ultralight replacement for the rear (12.19" X .81") goes for as low $40.
http://precisionbrakes.com/wilwood_ul_vented.html
If you track alot, this can be significant savings over time. Of course, that straight vane rotor will not be as good as the heavy duty directional vane that comes with the 2-piece rotor as part of this buy.
You have other options if you will not settle for anything less the correct diameter though. If you prefer Coleman rotors, they can make exact replacement rotors for you (the correct diameter, etc). Here is a link, and this example would be good for the front rotor:
http://www.colemanracing.com/section/index.htp?id=384
Other brake vendors can make custom replacement rotors for you as well, and you will need to do your research on this. Whatever you do, if you are not a professional, please consult with one before making any choices. Coleman, Wilwood, and other brake vendors (along with Precision of course) can help you make the right decision when it comes to replacing those rotors, when the time comes.
Regarding the rotors, another aspect of of the 2 piece design is that it allows one to replace just the rotor part of the brake rotor, which *may* result in savings, and/or allow you to use the replacement brand/model rotor of your choice.
Before going on though - in this post, my use of 'rotor' refers to the rotor part of the 2 piece rotor, and 'hat' refers to the machined hat of the assembly. (duh
Replacement rotors will be available from Precision for roughly $150/rotor. You do have other brands and models to choose from, though, and may be worth considering if you do alot of track events (and go thru rotors often). One of my requirements for the 2-piece rotors is that it uses a universal bolt pattern (to attach the rotor to the hat). This way, you are not required to buy Precision rotors if should want to use something else.
There are considerations though, so please read carefully:
There are a number of companies that make universal replacement rotors for 2 piece brake rotors, including www.wilwood.com , www.colemanracing.com , www.apracing.com and others.
However - with the exception of AP rotors (for the front rotors, not the rear) - nobody makes a replacement rotor that is the exact diameter of the RZ/RS spec rotors, which is 12.36". The closest 'standard' rotor is 12.19" .
What this means is that - should you choose to replace your rotor with a 12.19" rotor - the brake pad will 'hang over' the rotor by about 3mm or so. There is debate as to whether this makes any difference, with the brake vendor (obviously) not recommending you do so, and at least one track guy saying that he has not had any problems with his Mandeville front brakes (which has its brake pads overhang the rotor by a little bit). Another suggestion is to simply trim the excess brake pad.
The official word is that this is NOT recommended, and you do so at your own risk. We are all adults though (or at least most of us hehe), and this option is left open to you (by employing the universal bolt pattern) and your performance shop's judgement. Brakes are serious business though, and use professional judgement to decide what is better for your application. Again, do so at your own risk.
Why would you consider using a 12.19" standard rotor? Price - a Wilwood standard straight vane ultralight replacement for the rear (12.19" X .81") goes for as low $40.
http://precisionbrakes.com/wilwood_ul_vented.html
If you track alot, this can be significant savings over time. Of course, that straight vane rotor will not be as good as the heavy duty directional vane that comes with the 2-piece rotor as part of this buy.
You have other options if you will not settle for anything less the correct diameter though. If you prefer Coleman rotors, they can make exact replacement rotors for you (the correct diameter, etc). Here is a link, and this example would be good for the front rotor:
http://www.colemanracing.com/section/index.htp?id=384
Other brake vendors can make custom replacement rotors for you as well, and you will need to do your research on this. Whatever you do, if you are not a professional, please consult with one before making any choices. Coleman, Wilwood, and other brake vendors (along with Precision of course) can help you make the right decision when it comes to replacing those rotors, when the time comes.
09-01-2003, 10:15 PM
#25
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Join Date: Jan 2002
Location: Texas
Posts: 49
Originally Posted by eraumazda' date='Sep 1 2003, 03:06 PM
so these rotors are not FC approved huh
FYI, I am now positive that the FD my friend has does indeed have FC calipers, based on the pictures of calipers that I have seen of FC's. However, being able to mount the parts is just one part. There could be other considerations, such as clearance, etc. We will never know until somebody actually bolts a '99 RS/RZ spec to an FC. I'm guessing if it has happened, it probably somebody in Japan.
09-04-2003, 02:07 AM
#29
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Join Date: Jan 2002
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Posts: 49
Originally Posted by SageFC' date='Sep 3 2003, 07:17 PM
I'm interested in what we can do to adapt the rotor to the FC. Now the PBC rotors I don't believe are two piece floating, are they????
Rishie
Rishie
I'm sorry, I keep forgetting you can get more things besides wheels/tires. I should have gotten a quote from you as well, but the buy is already under way with a vendor that cannot be named here.
The PBC rotors are actually fixed, and not floating. Roger Mandeville (when I was working with him on the rotors initially, until it became apparent he could not do them for a competitive price) said that he did not believe there to be any real world advantages to a floating design. Seeing as he's a race car designer/former winning racer/etc, I did not dig much deeper into his thinking.
If you have any ideas of adapting the RZ/RS spec components to the FC though, I would love your input - thanks!
Daniel
09-04-2003, 02:13 AM
#30
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Join Date: Jan 2002
Location: Texas
Posts: 49
Hi all, Cut off date for ordering the rotors is next Friday (tentatively, may extend it a day or two for stragglers) - you may call in to place your deposit (50%) with Precision starting today. Phone number is on thier website, www.precisionbrakes.com .
Visa/MC/Discover, Paypal, and check is accepted. Check will require clearance before item ships. PM me with your full name, and I will start a list of names (first name, last initial) here and on the other forum.
Still working on a few small details regarding the calipers, please PM or check, um, the other forum.
Thanks!
Visa/MC/Discover, Paypal, and check is accepted. Check will require clearance before item ships. PM me with your full name, and I will start a list of names (first name, last initial) here and on the other forum.
Still working on a few small details regarding the calipers, please PM or check, um, the other forum.
Thanks!