|
Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
|
Thread Tools | Search this Thread |
01-26-2015, 03:47 PM | #1 |
Member
Join Date: Jan 2015
Drives: 2013 Fr-s Hot Lava
Location: Maryland
Posts: 33
Thanks: 0
Thanked 3 Times in 2 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Which is better? Reaplcing rear diff bushings? or installing rear diff brace?
Hey everyone. I've been on here for a few hours looking into which would suit me better in regards to a lot of drive train slop I have when pressing/letting off the gas pedal. (its as if the entire drive train moves forward and backward while I sit still in my seat when Im quickly giving it gas or letting off the gas) Its required me to change my entire driving habits and honestly is taking away from how the car should be driven if everything were tighter. I have come across two solutions (so far) which seem to gear toward the issues I'm experiencing. The first option would be to replace the rear diff bushings with white line rear bushings, however the install looks to be pretty involved with presses and stuff. However the other option I came across was the "beatrush rear diff brace" which actually from what I understand, sit on top of the existing rear diff mounts and bolts to the rear diff frame itself to make it stronger. My question is if the rear diff brace would be better than the bushing replacement method? My main goal is to reduce as much slop in the drive train as possible. Ill most likely be doing the perrin motor mounts also. Anyone with any experience with any of these or with other successful options would be greatly appreciated.
|
The Following User Says Thank You to Frs30 For This Useful Post: | ChrisD (01-27-2015) |
01-26-2015, 03:51 PM | #2 |
Senior Member
Join Date: Jun 2014
Drives: frs
Location: Gunsai
Posts: 4,877
Thanks: 7,148
Thanked 2,922 Times in 1,769 Posts
Mentioned: 23 Post(s)
Tagged: 2 Thread(s)
|
Both. Do it once, do it right
|
01-27-2015, 02:16 PM | #3 |
Senior Member
Join Date: Feb 2014
Drives: 2013 BRZ black
Location: Cincinnati, OH
Posts: 394
Thanks: 265
Thanked 283 Times in 113 Posts
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
|
I looked at a brace as well but as far as I can tell, its a backwards engineered reinforcement designed to imitate a solid type bushing. The brace will definitely stiffen up the differential, but for the cost of the Beatrush, I would just recommend purchasing the following:
http://www.ft86speedfactory.com/whit...nsert-846.html http://www.ft86speedfactory.com/whit...n-kit-287.html I installed these a few weeks back to reduce pinion angle fluctuations resulting in contact with my exhaust and I absolutely LOVE the driveline feel now. So much more responsive and predictable. Highly recommend as it is a WORLD of difference. The differential inserts include inserts for the two rear bushings (that you would be bracing) as well as inserts for the two front bushings. In addition to those, grab the subframe bushing inserts. Took me about 2 hours to install everything. Very easy upgrade and worth every penny. I dont feel the need AT ALL to have a brace with this current setup. but to each his own. Cheers. |
The Following 4 Users Say Thank You to xkalelx For This Useful Post: |
01-27-2015, 02:22 PM | #4 | |
Sweeper
Join Date: Oct 2014
Drives: '02 RA Bugeye | '15 FRS
Location: Seattle, WA
Posts: 1,876
Thanks: 2,291
Thanked 1,488 Times in 788 Posts
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I have subframe/outrigger/diff bushings ( referred to above, actually ), whiteline tranny bushing.. love it, but I feel the weak link is now the motor mounts. I'm also looking at the perrins. Definitely not going solid. I understand completely though what you mean and I do agree that the slop should have been toned down a little from the factory. What are they trying to appease here- grocery getters and old mums? |
|
01-27-2015, 03:01 PM | #5 |
Senior Member
Join Date: Jan 2015
Drives: GT86
Location: UK
Posts: 305
Thanks: 246
Thanked 195 Times in 81 Posts
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
|
I've noticed this problem as well, although I called it bad throttle response but maybe that was not the right term. Do you have any links for anywhere that confirms these bushings should fix it? As far as I can see from the description on them it just says they should help give less movement when cornering and help get rid of annoying noises... no mention of it improving anything when you get on and off the throttle
|
01-27-2015, 03:15 PM | #6 |
Senior Member
Join Date: Feb 2014
Drives: 2013 BRZ black
Location: Cincinnati, OH
Posts: 394
Thanks: 265
Thanked 283 Times in 113 Posts
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
|
[ame="http://youtu.be/IDfJ_zYFPcs"]http://youtu.be/IDfJ_zYFPcs[/ame]
[ame="http://youtu.be/dLzMO6_ZNHk"]http://youtu.be/dLzMO6_ZNHk[/ame] |
01-28-2015, 12:01 PM | #7 |
Senior Member
Join Date: Jan 2015
Drives: GT86
Location: UK
Posts: 305
Thanks: 246
Thanked 195 Times in 81 Posts
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
|
Trying to find somewhere in the UK that I can buy these - is this the same thing as the subframe lockout kit you recommended? http://www.tuningdevelopments.co.uk/...oducts_id=1331
Also what effect does the positive shift kit have? As far as I can see it is only for improving gear change feel? |
01-28-2015, 12:28 PM | #8 |
Senior Member
Join Date: Feb 2014
Drives: 2013 BRZ black
Location: Cincinnati, OH
Posts: 394
Thanks: 265
Thanked 283 Times in 113 Posts
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
|
Yes, that's the same kit as listed above.
The positive shift kit is another insert for the rear trans bushing and firms up the drive line as well. It won't improve gear change feel, but a short shifter upgrade will do that. This just takes the slop out of acceleration/deceleration at the transmission. Notice how the shifter shakes left and right under heavy acceleration? This insert will greatly reduce that. |
01-28-2015, 12:33 PM | #9 | |
Senior Member
Join Date: Jun 2012
Drives: Whiteout Scion FR-S
Location: Minnesota
Posts: 508
Thanks: 367
Thanked 209 Times in 129 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
Quote:
Rear Differential - mount in cradle & support outrigger insert bushing Over this one: Rear Differential - mount in cradle bushing Also, Whiteline makes another product for the differential: Rear Differential - support outrigger bushing which is very confusing for me. I can't figure out from their graphic where this is installed and why I might want one. Perhaps some of you could chime in with opinions on these three products.
__________________
My cars always dress formally. They all wear black tires.
|
|
01-28-2015, 01:07 PM | #10 |
Senior Member
Join Date: Sep 2013
Drives: 2022 WRB BRZ Sport-Tech
Location: Ottawa, Canada
Posts: 1,746
Thanks: 131
Thanked 1,410 Times in 715 Posts
Mentioned: 25 Post(s)
Tagged: 2 Thread(s)
|
I have the 925 insert bushing. I chose it instead of the 924 version.
To install the 924 bushing you have to remove the existing bushings, which involves cutting one of them out of the sub-frame. The 925 version is just an insert that fills in the existing gaps, so no need to remove the old ones. The outrigger bushing is on the actual differential. If you download the install guide you will see a better picture. According to the install guide, you actually need to take the differential off to install that one. |
01-28-2015, 04:26 PM | #11 | |||
Senior Member
Join Date: Feb 2014
Drives: 2013 BRZ black
Location: Cincinnati, OH
Posts: 394
Thanks: 265
Thanked 283 Times in 113 Posts
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
|
^^ what he said.
Quote:
Quote:
Quote:
The inserts are great and well engineered. Start there and if you want more rigidness in the future, you can upgrade piece by piece. Hope this helps. |
|||
The Following 4 Users Say Thank You to xkalelx For This Useful Post: |
01-28-2015, 04:30 PM | #12 |
Senior Member
Join Date: Feb 2014
Drives: 2013 BRZ black
Location: Cincinnati, OH
Posts: 394
Thanks: 265
Thanked 283 Times in 113 Posts
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
|
Can someone with a brace installed chime in with performance feedback?
|
01-28-2015, 05:40 PM | #13 | |
Senior Member
Join Date: Oct 2012
Drives: UK GT86
Location: UK
Posts: 3,040
Thanks: 185
Thanked 1,629 Times in 1,112 Posts
Mentioned: 155 Post(s)
Tagged: 1 Thread(s)
|
Quote:
__________________
.: Stealth 86 :.
Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook |
|
01-28-2015, 10:22 PM | #14 |
The Mechanic
Join Date: Mar 2012
Drives: Civic Turbo,FR-S
Location: NJ
Posts: 928
Thanks: 130
Thanked 171 Times in 119 Posts
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
|
i have a cusco brace. It increases vibration as you drive and it has surface rust in the year and a half ive had it. i haven't tried the bushing inserts but if they were available when i got the brace i would have chose the inserts
__________________
|
|
|
Tags |
brace, bushing, drive train slop, mount, rear diff |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Video and short review on the Cusco Engine Mounts and Rear Diff Brace | RallySport Direct | Engine, Exhaust, Transmission | 24 | 07-23-2018 03:43 AM |
Rear diff LSD question | Dephective | Engine, Exhaust, Transmission | 15 | 09-01-2013 05:30 PM |
Rear Suspension Video (Look at diff bushings!) | d1ck | Tracking / Autocross / HPDE / Drifting | 0 | 07-01-2013 10:02 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 |
Rear diff service | JoeBoxer | Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) | 22 | 11-06-2012 10:23 PM |