Lightweight REAR rotor options - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

himbo · 04-02-2014, 07:29 AM

I know there is the P&L lightweight rear brake upgrade as well as various lighter weight BBK kits. However, the P&L kit is hardly streetable while the BBK's are overkill IMO. I think the best compromise is installing lighter rotors for the rear. Problem is, I can't find anyone who seems to make them. I think knocking off a 2-3lbs per disc can have very noticeable effects to handling, braking, and accelerating.

Anyone wanna chime in? Some simple stock-sized, slotted rotors could do the trick. Maybe something with an aluminum hat?

Thanks in advance!

JerryMichaels7 · 04-02-2014, 08:48 AM

What makes the P&l not streetable?? Deletes e-brake?

himbo · 04-02-2014, 09:10 AM

OTE=JerryMichaels7;1643395]What makes the P&l not streetable?? Deletes e-brake?[/QUOTE]

Yeah for me streetable means ebrake. I know different people have different definitions of streetable, but that's where I draw the line.

I just think that a slightly lighter disc would be more than adequate and cost effective.

ZionsWrath · 04-02-2014, 09:16 AM

My guess is something like that would be so niche, the cost would be halfway to a rear BBK.

himbo · 04-02-2014, 09:29 AM

How so? There are lots of slotted or drilled rotors out there. Lots with aluminum hats. I'm just wondering if anyone makes them in the stock size. I'm not looking for ultra lightweight rotors. Just a slight and rather basic upgrade. Coupled with some SS lines and decent pads, a slightly lighter disc would make a noticeable difference in my opinion.

wparsons · 04-02-2014, 09:55 AM

I don't think you'll ever find a two piece rotor with an aluminum hat that retains the stock e-brake functionality...

himbo · 04-02-2014, 11:23 AM

Why is that? The drum is still there right? Isn't this just a matter of replacing discs?

mines13 · 04-02-2014, 12:17 PM

Quote:

Originally Posted by wparsons

I don't think you'll ever find a two piece rotor with an aluminum hat that retains the stock e-brake functionality...

I wouldn't rule it out. They certainly exist for other applications, I've installed the Wilwood and the Stoptech setups on 350Z's in a past life. Here is an example for the Stoptech rear rotor for the 350Z. It integrates the drum inside the aluminum hat. They do state that you should absolutely not use the e-brake for anything other then parking however. Perhaps Stoptech builds one for our car since they offer it for other vehicles with a similar e-brake configuration?

wparsons · 04-02-2014, 12:32 PM

Quote:

Originally Posted by himbo

Why is that? The drum is still there right? Isn't this just a matter of replacing discs?

The drum is part of the stock disc...

CSG David · 04-02-2014, 12:59 PM

Would be interesting, but haven't seen anybody actually benefit with it. On paper and in theory, it should benefit performance, but the reality is it requires a trade-off that I'm not willing to take. Oh look, super fast acceleration from 0 to 20mph.

Black Tire · 04-02-2014, 01:16 PM

Quote:

Originally Posted by mines13

I wouldn't rule it out. They certainly exist for other applications, I've installed the Wilwood and the Stoptech setups on 350Z's in a past life. Here is an example for the Stoptech rear rotor for the 350Z. It integrates the drum inside the aluminum hat. They do state that you should absolutely not use the e-brake for anything other then parking however. Perhaps Stoptech builds one for our car since they offer it for other vehicles with a similar e-brake configuration?

I am intrigued by this question as well. I haven't seen any great solutions. The one in the above picture with the aluminum hat/drum may actually work for an emergency stop, ONCE. After that you will probably need a new rotor and possible some new brake shoes and/or other parts if the aluminum has melted. Good luck trying to drive home if the shoes fuse to the drums.

CSG David · 04-02-2014, 01:45 PM

Quote:

Originally Posted by Black Tire

I am intrigued by this question as well. I haven't seen any great solutions. The one in the above picture with the aluminum hat/drum may actually work for an emergency stop, ONCE. After that you will probably need a new rotor and possible some new brake shoes and/or other parts if the aluminum has melted. Good luck trying to drive home if the shoes fuse to the drums.

The easiest example that comes to mind is Robispec. He used 4lb rear rotors. He would snap them literally almost every session. Then he used 7lb rear rotors...it would last 1 to 2 full days. Keep in mind, his car is like 400lbs lighter than all of our cars...

himbo · 04-02-2014, 02:54 PM

Quote:

Originally Posted by wparsons

The drum is part of the stock disc...

Aha! That explains it. Haven't actually seen the pics of the rear disc. I always thought the drum was seperated from the disc. Damn. That sucks

JerryMichaels7 · 04-02-2014, 03:03 PM

I agree with you OP. Just wasn't for sure if they did delete e brakes or not.

04-02-2014, 07:29 AM	#1
himbo Senior Member Join Date: Mar 2010 Drives: Lightening Red BRZ Ltd. Location: North Jersey Mutha Luva!!! Posts: 226 Thanks: 67 Thanked 94 Times in 44 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Lightweight REAR rotor options I know there is the P&L lightweight rear brake upgrade as well as various lighter weight BBK kits. However, the P&L kit is hardly streetable while the BBK's are overkill IMO. I think the best compromise is installing lighter rotors for the rear. Problem is, I can't find anyone who seems to make them. I think knocking off a 2-3lbs per disc can have very noticeable effects to handling, braking, and accelerating. Anyone wanna chime in? Some simple stock-sized, slotted rotors could do the trick. Maybe something with an aluminum hat? Thanks in advance!

04-02-2014, 08:48 AM	#2
JerryMichaels7 Senior Member Join Date: Mar 2013 Drives: Whiteout FRS Location: South, Ga Posts: 348 Thanks: 19 Thanked 144 Times in 80 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	What makes the P&l not streetable?? Deletes e-brake? __________________ life's greatest stories usually start with the words, "fuck it!".

04-02-2014, 03:03 PM	#14
JerryMichaels7 Senior Member Join Date: Mar 2013 Drives: Whiteout FRS Location: South, Ga Posts: 348 Thanks: 19 Thanked 144 Times in 80 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I agree with you OP. Just wasn't for sure if they did delete e brakes or not. __________________ life's greatest stories usually start with the words, "fuck it!".

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04-02-2014, 09:10 AM	#3
himbo Senior Member Join Date: Mar 2010 Drives: Lightening Red BRZ Ltd. Location: North Jersey Mutha Luva!!! Posts: 226 Thanks: 67 Thanked 94 Times in 44 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	OTE=JerryMichaels7;1643395]What makes the P&l not streetable?? Deletes e-brake?[/QUOTE] Yeah for me streetable means ebrake. I know different people have different definitions of streetable, but that's where I draw the line. I just think that a slightly lighter disc would be more than adequate and cost effective.

04-02-2014, 09:16 AM	#4
ZionsWrath Thanks Join Date: Apr 2013 Drives: BRZ Location: NY Posts: 4,163 Thanks: 5,989 Thanked 3,100 Times in 1,498 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	My guess is something like that would be so niche, the cost would be halfway to a rear BBK.

04-02-2014, 09:29 AM	#5
himbo Senior Member Join Date: Mar 2010 Drives: Lightening Red BRZ Ltd. Location: North Jersey Mutha Luva!!! Posts: 226 Thanks: 67 Thanked 94 Times in 44 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	How so? There are lots of slotted or drilled rotors out there. Lots with aluminum hats. I'm just wondering if anyone makes them in the stock size. I'm not looking for ultra lightweight rotors. Just a slight and rather basic upgrade. Coupled with some SS lines and decent pads, a slightly lighter disc would make a noticeable difference in my opinion.

04-02-2014, 11:23 AM	#7
himbo Senior Member Join Date: Mar 2010 Drives: Lightening Red BRZ Ltd. Location: North Jersey Mutha Luva!!! Posts: 226 Thanks: 67 Thanked 94 Times in 44 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Why is that? The drum is still there right? Isn't this just a matter of replacing discs?

04-02-2014, 12:59 PM	#10
CSG David Join Date: Aug 2012 Drives: S2000 CR Location: California Posts: 2,109 Thanks: 537 Thanked 1,721 Times in 956 Posts Mentioned: 173 Post(s) Tagged: 3 Thread(s)	Would be interesting, but haven't seen anybody actually benefit with it. On paper and in theory, it should benefit performance, but the reality is it requires a trade-off that I'm not willing to take. Oh look, super fast acceleration from 0 to 20mph.

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