looking for 2 piece brake rotors.
12-01-2005, 07:38 PM
#27
Pink Means PASS
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We have very few 8's going stu in my area. Not to say that with the right setup and driver they couldn't compete. The STI's seem to pretty dominant in FL.
Edit- I don't guess that it has much to do with 2 piece brake rotors
Edit- I don't guess that it has much to do with 2 piece brake rotors
Last edited by whiterex; 12-01-2005 at 07:41 PM.
12-01-2005, 07:56 PM
#28
Originally Posted by crossbow
TeamRx8,
Have you competed in that class yet? How does the 8 fair?
Have you competed in that class yet? How does the 8 fair?
https://www.rx8club.com/rx-8-racing-25/phat-76896/
RacingBrakes clarified that they "estimate" a 2-pc rear rotor will shave off approx. 9.6 lb. per rotor, so quite a bit more than the front rotors. Probably less weight savings than the front on a replacement rear caliper if they end up pursuing that too.
Note that despite being lighter than OE their 2-pc OE replacement and 13" BBK rotor has equal or better heat sink mass capability and in theory better air cooling capability than the OE discs. The main rotor weight savings is in the aluminum hat. The caliper heat sink mass has no real effect on braking capability so that's just less weight for the suspension to control and the engine to work against. The exception is that if it's too lightweight it will flex too much which can lead to less feel under braking. However, their caliper weight and design seems inline with the usual caliper manufacturers.
IMO, at the pre-sale price the cost is extremely attractive for what they are providing. I'm sure a kit such as Stoptech costs more for a reason, but be realistic; how many RX-8 owners are going to be running 10/10ths competition laps on the fastest road courses in America? Not too many ...
Last edited by TeamRX8; 12-01-2005 at 08:28 PM.
12-01-2005, 08:05 PM
#29
Originally Posted by AlexCisneros
16.2 front and 16.8 rear... Not bad for $200 rims (they're no 15lb SSRs, but then they cost half as much )
According to Tire Rack (via spec sheet) the 225/45/18 RE040 weigh 28lbs and the Kumho MX 275/40/17 weigh 28lbs so no real gain or loss there
)According to Tire Rack (via spec sheet) the 225/45/18 RE040 weigh 28lbs and the Kumho MX 275/40/17 weigh 28lbs so no real gain or loss there
you have different (width or ?) wheels front & rear, all with the 275/40-17 MX's on them?
12-01-2005, 09:47 PM
#30
Registered User
different widths for clearance (they didn't have unlimited offset choices). I'm running 8" in front 9" in rear with 275s all around (don't start with me on tire flex/turn-in and all the other associated cons 
there is still more rubber and more grip and with the right pressure 
)
On another note... Are you going to be running Azenis, Kumho, or other?
there is still more rubber and more grip and with the right pressure ) On another note... Are you going to be running Azenis, Kumho, or other?
12-01-2005, 09:48 PM
#31
I talk to cones
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Originally Posted by TeamRX8
you have different (width or ?) wheels front & rear, all with the 275/40-17 MX's on them?
(edit: just as I was typing the answer appeared. Issue is 9" rims on the front. Duh.)
Last edited by Sparky; 12-01-2005 at 10:03 PM.
read the other thread... 
12-03-2005, 04:49 PM
#36
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Does anyone know what kind of research racing brake puts into the caliper valving in their big brake kits to ensure proper operation with the rest of the rx8's brake system?
The reason I ask is all I can find on their site is alot of info on their rotors.
The reason I ask is all I can find on their site is alot of info on their rotors.
12-03-2005, 09:10 PM
#37
Momentum Keeps Me Going
I had the same thought about their focus on rotors to the exclusion of all else on their web site. After reading through the Stoptech site and realizing the problems possible if caliper/piston design is not considered for each vehicle's specific electronic's and braking profile, I am wondering too.
Although the big brake kit is a nice price, are you simply getting what you pay for, or is it a good deal? Inqiring minds would like answers for these questions. I've left a question to this effect on their forum, lets hope they have suitable answers.
Although the big brake kit is a nice price, are you simply getting what you pay for, or is it a good deal? Inqiring minds would like answers for these questions. I've left a question to this effect on their forum, lets hope they have suitable answers.
12-04-2005, 11:53 AM
#38
Momentum Keeps Me Going
BTW, here's the linkie to that question I put to them http://forums.racingbrake.com/viewtopic.php?t=42
I note today they answered the questions extensively today (Sunday!!)
. They certainly seem to be trying to accomodate us with options for our car which is very helpful. And what I get bottom line from their answer is that they seem to be recommending upgrading the rotor and not the caliper. The wording is a bit difficult to follow in places but the part here,
"You will probably agree that the need and importance of aluminum caliper upgrade is somewhat over-emphasized in the performance industry. If you look closely for the size of rotor they offer; basically only three sizes: 355x32, 332x32 and 328x28 regardless of vehicle weight and speed while the remaining variation are caliper piston number and size, brake system design and bias etc. which is usually modified and dealt on the professional level while the tracks and those racers are well equipped to deal with the situation resulting from any possible malfunctions of the brake system and we believe it’s somewhat beyond our targeted customers and enthusiasts here."
and they continue,
"Our advice to customers are buy just just what you need and don't waste money and buy something you don't need such as BBK unless you really need it. So just remember for RX8 we have the same offer; one-piece, two-piece stock replacement and 13" BBK. We suggest customer to upgrade to our two-piece stock replacement first and later on if you still wants to upgrade to our 4 piston caliper kit he can just add the caliper and adaptor but still can use the same rotors (stock size is 322x24 and BBK is 332 the different is not much)"
and something I didn't know,
"In fact we are offering our same two-piece rotors to Sylvain Tremblay – A well know Mazda racer who prefers to race with stock caliper."
I still didn't see (someone correct me if I'm wrong), that they have designed their caliper to OEM spec to preserve our brake system electronic aids, unless this says it,
"Our kits are carefully engineered and built within OE design parameters which is safe and sound than any competitions."
I guess saving money getting only the rotors and getting better performance isn't so hard if we do what they suggest
I note today they answered the questions extensively today (Sunday!!)
. They certainly seem to be trying to accomodate us with options for our car which is very helpful. And what I get bottom line from their answer is that they seem to be recommending upgrading the rotor and not the caliper. The wording is a bit difficult to follow in places but the part here, "You will probably agree that the need and importance of aluminum caliper upgrade is somewhat over-emphasized in the performance industry. If you look closely for the size of rotor they offer; basically only three sizes: 355x32, 332x32 and 328x28 regardless of vehicle weight and speed while the remaining variation are caliper piston number and size, brake system design and bias etc. which is usually modified and dealt on the professional level while the tracks and those racers are well equipped to deal with the situation resulting from any possible malfunctions of the brake system and we believe it’s somewhat beyond our targeted customers and enthusiasts here."
and they continue,
"Our advice to customers are buy just just what you need and don't waste money and buy something you don't need such as BBK unless you really need it. So just remember for RX8 we have the same offer; one-piece, two-piece stock replacement and 13" BBK. We suggest customer to upgrade to our two-piece stock replacement first and later on if you still wants to upgrade to our 4 piston caliper kit he can just add the caliper and adaptor but still can use the same rotors (stock size is 322x24 and BBK is 332 the different is not much)"
and something I didn't know,
"In fact we are offering our same two-piece rotors to Sylvain Tremblay – A well know Mazda racer who prefers to race with stock caliper."
I still didn't see (someone correct me if I'm wrong), that they have designed their caliper to OEM spec to preserve our brake system electronic aids, unless this says it,
"Our kits are carefully engineered and built within OE design parameters which is safe and sound than any competitions."
I guess saving money getting only the rotors and getting better performance isn't so hard if we do what they suggest
Last edited by Spin9k; 12-04-2005 at 03:48 PM.
12-04-2005, 03:58 PM
#40
Momentum Keeps Me Going
Originally Posted by TeamRX8
are you planning on running Lemans or something?
... but if I'm going to spend $$ and time screwing around changing an already good setup I don't want simply flashy 4show-junk. As a technically oriented tuner I want safety 1st, along w/quality and performance. I see nothing unusual about asking someone to clarify what they sell w/facts.
Last edited by Spin9k; 12-04-2005 at 04:05 PM.
12-04-2005, 04:03 PM
#41
Bummed, but bring on OU!
Originally Posted by Spin9k
We suggest customer to upgrade to our two-piece stock replacement first and later on if you still wants to upgrade to our 4 piston caliper kit he can just add the caliper and adaptor but still can use the same rotors (stock size is 322x24 and BBK is 332 the different is not much)"
I guess that means the caliper is compatible with stock sized rotors. That'll make buying the whole thing in pieces an option.
I'm not after brake performance upgrades as much as unsprung (or sprung) weight reduction. Any weight reduction in this car is difficult. 50lbs or so off the corners would be nice. If the superchargers ever make it to market, the braking upgrade will be a nice plus.
12-04-2005, 04:31 PM
#42
Momentum Keeps Me Going
Originally Posted by therm8
Any weight reduction in this car is difficult. 50lbs or so off the corners would be nice. If the superchargers ever make it to market, the braking upgrade will be a nice plus.
and 50 lbs is PFG I'd agree. I think it would be a hellofa lot easier (and no more expensive) if we could finally just throw some HP (read SC) at the car rather than piecemealing it off this way 
.And then there's dieting LOL!
12-04-2005, 07:08 PM
#43
you can do anything you want on the street if you have unlimited funds, but if you want to compete in a particular class you have specific allowances only and if it's a hobby and you don't have unlimited funds then you have to look at getting the most bang for the buck.
Of course if you're a technically oriented tuner you won't have any issue dialing it with some mods if it does turn out to have an imbalance
I assume you'll also be using Koni 2822 4-way adjustable IRL shocks with Ti springs rather than some cheap ol' Koni SA or Tein street shocks
Of course if you're a technically oriented tuner you won't have any issue dialing it with some mods if it does turn out to have an imbalance
I assume you'll also be using Koni 2822 4-way adjustable IRL shocks with Ti springs rather than some cheap ol' Koni SA or Tein street shocks
Last edited by TeamRX8; 12-04-2005 at 07:13 PM.
12-04-2005, 10:11 PM
#44
Bummed, but bring on OU!
Originally Posted by TeamRX8
you can do anything you want on the street if you have unlimited funds, but if you want to compete in a particular class you have specific allowances only and if it's a hobby and you don't have unlimited funds then you have to look at getting the most bang for the buck.
Of course if you're a technically oriented tuner you won't have any issue dialing it with some mods if it does turn out to have an imbalance
I assume you'll also be using Koni 2822 4-way adjustable IRL shocks with Ti springs rather than some cheap ol' Koni SA or Tein street shocks
Of course if you're a technically oriented tuner you won't have any issue dialing it with some mods if it does turn out to have an imbalance
I assume you'll also be using Koni 2822 4-way adjustable IRL shocks with Ti springs rather than some cheap ol' Koni SA or Tein street shocks
What's with the hostility? These 2 piece rotors are the cheapest you can get. Which is not much of an accomplishment really, considering the price of the few others. Half the point is to reduce weight. Cheaper, one piece rotors won't cut it in that respect. Weight reduction from the calipers is nice too. But if you're going to go with the calipers, it seems a good idea to make sure they're fully compatible. I guess I don't get why this upsets you so.
12-04-2005, 10:28 PM
#45
there's no more hostility in the answer than in the question 
we're just talking, I have my own way of making my point, lighten up ... 
I guess I'm confused since I'm going to get a set, I'm not upset about anything
I can only guess that you completely misinterpreted my response 
we're just talking, I have my own way of making my point, lighten up ... I guess I'm confused since I'm going to get a set, I'm not upset about anything
I can only guess that you completely misinterpreted my response
Last edited by TeamRX8; 12-04-2005 at 10:32 PM.
