Is it ok to install the Cusco diff collars without the rear inserts? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Ultramaroon · 07-13-2019, 04:09 PM

They're sold separately but I think that, because the front collars create a hard mount point, it's asking too much of that cantilevered load to support all of the torsion. I still see significant vertical deflection at the left rear isolator.

Anyone running like this? How long?

Ultramaroon · 07-15-2019, 04:37 PM

Nobody? Am I that special?

StraightOuttaCanadaEh · 07-15-2019, 04:42 PM

I ran it that way for 5-6 months, no issues. I had the Whiteline inserts though, don't know if that makes a difference

Ultramaroon · 07-15-2019, 09:11 PM

Quote:

Originally Posted by StraightOuttaCanadaEh

I ran it that way for 5-6 months, no issues. I had the Whiteline inserts though, don't know if that makes a difference

IIRC the Whiteline inserts are polyurethane, yes?

The steel Cusco collars take up all the available slack. There's a hard plastic layer but it doesn't actually have any give. They're literally hard mount points now. Feels great but I'm a little worried about the cyclical load on those screws.

I'll watch it carefully the next few weeks.

StraightOuttaCanadaEh · 07-15-2019, 09:49 PM

Quote:

Originally Posted by Ultramaroon

IIRC the Whiteline inserts are polyurethane, yes?

The steel Cusco collars take up all the available slack. There's a hard plastic layer but it doesn't actually have any give. They're literally hard mount points now. Feels great but I'm a little worried about the cyclical load on those screws.

I'll watch it carefully the next few weeks.

Eeek how’s the NVH? Cause I have the polyurethane diff inserts but I’m quite alright with the extra noise and clatter so if I can reduce the slop even more, I’m willing to go even stiffer

Ultramaroon · 07-16-2019, 12:43 AM

Quote:

Originally Posted by StraightOuttaCanadaEh

Eeek how’s the NVH? Cause I have the polyurethane diff inserts but I’m quite alright with the extra noise and clatter so if I can reduce the slop even more, I’m willing to go even stiffer

There's a bright resonance right around 120 Km/hr. I'm ok with it today but I need to do some highway cruising before I commit. On the flip side, ten minutes on the Rhino ramps and it's back to stock.

Ultramaroon · 09-27-2019, 11:25 PM

I removed them yesterday. Without equal support at the rear, the reaction torque is transmitted right through the mounting screws. The diff was yanking on the screws hard enough to make them creak.

The remaining backlash hammered with with an intensity that felt unhealthy.

07-13-2019, 04:09 PM	#1
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,865 Thanks: 52,120 Thanked 36,513 Times in 18,917 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	Is it ok to install the Cusco diff collars without the rear inserts? They're sold separately but I think that, because the front collars create a hard mount point, it's asking too much of that cantilevered load to support all of the torsion. I still see significant vertical deflection at the left rear isolator. Anyone running like this? How long? __________________ service manuals Last edited by Ultramaroon; 07-15-2019 at 04:37 PM.

07-15-2019, 04:37 PM	#2
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,865 Thanks: 52,120 Thanked 36,513 Times in 18,917 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	Nobody? Am I that special? __________________ service manuals

07-15-2019, 04:42 PM	#3
StraightOuttaCanadaEh Wes Join Date: Feb 2017 Drives: Artisan Spirits '17 86 Location: Toronto Posts: 2,794 Thanks: 1,165 Thanked 1,674 Times in 994 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	I ran it that way for 5-6 months, no issues. I had the Whiteline inserts though, don't know if that makes a difference __________________ Instagram: @gt86ws

09-27-2019, 11:25 PM	#7
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,865 Thanks: 52,120 Thanked 36,513 Times in 18,917 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	I removed them yesterday. Without equal support at the rear, the reaction torque is transmitted right through the mounting screws. The diff was yanking on the screws hard enough to make them creak. The remaining backlash hammered with with an intensity that felt unhealthy. __________________ service manuals

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Diff Mount Inserts install - Diff won't lower???	ChRZ	Suspension \| Chassis \| Brakes -- Sponsored by 949 Racing	4	07-17-2017 12:07 AM
FS: Whiteline rear diff inserts	rever5e	Brakes, Suspension, Chassis	6	03-16-2015 08:23 PM
Cusco Engine Mounts and Cusco Rear Diff Brace - Stiffen up your BRZ/FR-S!!!	RallySport Direct	Transmission and Driveline	10	03-12-2013 02:11 PM
Cusco Rear Diff Covers!!! Cusco LSD Units!	vividracing	Transmission and Driveline	0	06-18-2012 03:24 PM
Cusco Rear Diff. Jewelry	Blaaaack-BRZ	Engine, Exhaust, Transmission	24	05-12-2012 03:28 PM

User Name		Remember Me?
Password