Lightweight REAR rotor options - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

celica73 · 04-02-2014, 03:05 PM

Non-US 86's have smaller non-vented rotors as the standard part, it looks like those come in about 1.5 lbs lighter per rotor.

CSG David · 04-02-2014, 03:15 PM

Quote:

Originally Posted by celica73

Non-US 86's have smaller non-vented rotors as the standard part, it looks like those come in about 1.5 lbs lighter per rotor.

WRX rear.

Poodles · 04-03-2014, 12:35 AM

Aluminum hat with a working e-brake does exist for other applications (bolt in and replaceable steel liner).

I could bug him and see if he's interested in this platform...

DAEMANO · 04-03-2014, 02:20 AM

Paging @RB Performance Brakes

These guys might sell you just the rear rotors. They do offer a full kit here:
https://www.racingbrake.com/ProductD...ductCode=2315K

Rotor Design:
These two-piece REAR rotors are made with the latest technology that is exclusive to RB. The rotor hats are constructed of aluminum with an iron sleeve insert. This allows significant weight savings, while still preserving the use of the stock emergency brake. This design is only available through RB!

himbo · 04-04-2014, 07:11 AM

Quote:

Originally Posted by DAEMANO

Paging @RB Performance Brakes

These guys might sell you just the rear rotors. They do offer a full kit here:
https://www.racingbrake.com/ProductD...ductCode=2315K

Rotor Design:
These two-piece REAR rotors are made with the latest technology that is exclusive to RB. The rotor hats are constructed of aluminum with an iron sleeve insert. This allows significant weight savings, while still preserving the use of the stock emergency brake. This design is only available through RB!

This looks great! I'm gonna reach out to them and see if there's anyway they could do a stock sized rotor. Maybe err can do a group buy if we get enough people.

Poodles · 04-07-2014, 12:54 AM

Not exclusive at all

Hell, those other ones I posted where developed years ago... Might have to inform him.

diss7 · 04-07-2014, 01:22 AM

If taking that serious, then why need e-brake?

I was going to run custom rear brakes and dual caliper with hydro handbrake, but the drum hand brake is so good, do not need to change

Poodles · 04-07-2014, 03:04 AM

Quote:

Originally Posted by diss7

If taking that serious, then why need e-brake?

I was going to run custom rear brakes and dual caliper with hydro handbrake, but the drum hand brake is so good, do not need to change

E-brake is required to pass inspection. Dual calipers likely adds more unsprung weight. Hydro handbrake is only used for drifting, it's NEVER a replacement for parking brake as locking the system like that for extended periods will damage components and isn't reliable enough.

diss7 · 04-07-2014, 03:41 AM

Leave car in gear. Same effect as handbrake

Poodles · 04-08-2014, 01:40 AM

Quote:

Originally Posted by diss7

Leave car in gear. Same effect as handbrake

No, as even a gentle slope is enough to rotate the engine. You can rotate the engine by hand, what makes you think the entire weight of the car can't do it?

diss7 · 04-08-2014, 01:49 AM

Quote:

Originally Posted by Poodles

No, as even a gentle slope is enough to rotate the engine. You can rotate the engine by hand, what makes you think the entire weight of the car can't do it?

Lol.

mike156 · 04-08-2014, 07:14 PM

The transmission, rear diff and something called torque multiplication?

If the engine has about 50 ft-lbs of compression/friction at the crank, that's over 700ft-lbs at the wheels. That's a 15* slope, or roughly a 30% grade...

That said, there are lots of times you'll want the engine running but the car to not go any where. Sitting in Grid, warming up the engine in the morning, in a drive through, etc.

It's a PITA to not have an ebrake but an aluminum hat could easily handle these needs.

Poodles · 04-09-2014, 02:50 PM

Quote:

Originally Posted by mike156

The transmission, rear diff and something called torque multiplication?

If the engine has about 50 ft-lbs of compression/friction at the crank, that's over 700ft-lbs at the wheels. That's a 15* slope, or roughly a 30% grade...

That said, there are lots of times you'll want the engine running but the car to not go any where. Sitting in Grid, warming up the engine in the morning, in a drive through, etc.

It's a PITA to not have an ebrake but an aluminum hat could easily handle these needs.

Takes far less than that to rotate the engine, and the resistance isn't constant. If someone bumps the car and gets it over the hump of compression, the car will easily keep moving. Unlike using the parking brake which unless the cable breaks (unlikely) won't have this issue.

It's also illegal damn near everywhere to park in this manner as well.

industrial · 04-09-2014, 06:59 PM

You could always chock a wheel. I had to do that every time I got of my truck in the Air Force. I think there could be a decent market for the rb rotor setup in the rear. I wonder how much weight it would save though?

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04-02-2014, 03:05 PM	#15
celica73 Senior Member Join Date: Jun 2012 Drives: '13 BRZ / '11 Outback / '06 Tundra Location: Durham NC Posts: 510 Thanks: 6 Thanked 155 Times in 104 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Non-US 86's have smaller non-vented rotors as the standard part, it looks like those come in about 1.5 lbs lighter per rotor.

04-03-2014, 12:35 AM	#17
Poodles Senior Member Join Date: Oct 2013 Drives: 2015 Series.Blue Location: Fort Worth, TX Posts: 1,781 Thanks: 88 Thanked 781 Times in 481 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Aluminum hat with a working e-brake does exist for other applications (bolt in and replaceable steel liner). I could bug him and see if he's interested in this platform...

04-07-2014, 12:54 AM	#20
Poodles Senior Member Join Date: Oct 2013 Drives: 2015 Series.Blue Location: Fort Worth, TX Posts: 1,781 Thanks: 88 Thanked 781 Times in 481 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Not exclusive at all Hell, those other ones I posted where developed years ago... Might have to inform him.

04-07-2014, 01:22 AM	#21
diss7 Banned Join Date: Sep 2012 Drives: AE86, 2x GT86, TE27 Location: Christchurch NZ Posts: 1,478 Thanks: 826 Thanked 1,179 Times in 522 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	If taking that serious, then why need e-brake? I was going to run custom rear brakes and dual caliper with hydro handbrake, but the drum hand brake is so good, do not need to change

04-07-2014, 03:41 AM	#23
diss7 Banned Join Date: Sep 2012 Drives: AE86, 2x GT86, TE27 Location: Christchurch NZ Posts: 1,478 Thanks: 826 Thanked 1,179 Times in 522 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	Leave car in gear. Same effect as handbrake

04-08-2014, 07:14 PM	#26
mike156 Member Join Date: Mar 2013 Drives: EVO Location: Utah Posts: 75 Thanks: 3 Thanked 49 Times in 26 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	The transmission, rear diff and something called torque multiplication? If the engine has about 50 ft-lbs of compression/friction at the crank, that's over 700ft-lbs at the wheels. That's a 15* slope, or roughly a 30% grade... That said, there are lots of times you'll want the engine running but the car to not go any where. Sitting in Grid, warming up the engine in the morning, in a drive through, etc. It's a PITA to not have an ebrake but an aluminum hat could easily handle these needs.

04-09-2014, 06:59 PM	#28
industrial Add lightness! Join Date: Apr 2012 Drives: 17' WRX Location: Boston Posts: 1,253 Thanks: 380 Thanked 888 Times in 411 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	You could always chock a wheel. I had to do that every time I got of my truck in the Air Force. I think there could be a decent market for the rb rotor setup in the rear. I wonder how much weight it would save though?

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