Drivetrain slop? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

TouchMyHonda · 05-27-2013, 12:11 PM

Ditto

brillo · 05-28-2013, 09:14 AM

going to install the subframe bushings and tranny mounts and see what improvements I get. I don't want the car vibrating at idle, but I think some stiffer bushings will help especially when launching the car or cornering hard.

Mikem53 · 05-28-2013, 09:28 AM

Depends on what you put a priority on with this car.. When you add stiffer mounts to tighten up the driveline.. You will be transferring NVH to the cabin..
Everything is a compromise.. It's setup to be liveable on an everyday basis.. If it were my dedicated track toy.. I would be addressing some of the slack in the system..

Ingen · 05-29-2013, 08:00 AM

Sometimes when I let the clutch out and get on the gas it'll fee like it sort of lurches or jerks and then accelerates. I get the same thing if I lift, it sort of feels like a little impact. IS that caused by the weak-sauce bushings and motor mounts?

What specifically should I change to fix that? This is my autocross toy but ALSO my daily driver, with 2 hours a day spent highway commuting. I need a happy medium here, if at all possible

xjohnx · 05-29-2013, 08:55 AM

Quote:

Originally Posted by moto-mike

Huge issue on this car. You'll want the whiteline subframe and diff inserts to take care of it. Driving them back to back is like night and day. I thought there was some throttle response/delay issue with the ECU at first until I drove a properly tightened up car. Some videos online of the diff movement.

How difficult of an install are the subframe and diff inserts?

Xero-Limit · 05-29-2013, 09:50 AM

Quote:

Originally Posted by xjohnx

How difficult of an install are the subframe and diff inserts?

Easy. Sounds much much worse than it is. Just have two jacks if you don't have a lift, and impacts help. Make 100% sure the subframe/diff are lifted back up and in the right position before putting the bolts back in, and start easily by hand. Otherwise this is where people run into issues.

IMO it is much better now, but I think the motor mounts are the other 30%. That's next.

RallySport Direct · 05-29-2013, 10:57 AM

We made this video which shows how much movement is in the rear diff. This will be Stock vs. the Cusco rear diff mount.

[ame="http://youtu.be/10rspcW8uek"]http://youtu.be/10rspcW8uek[/ame]

Myles at @Racecomp Engineering also speaks highly of the Whiteline Rear Diff Inserts, and I would agree with him. I think anything you can do to take up the slop is going to make a big difference.

Thanks,
Rick

Hawaiian · 05-29-2013, 11:46 AM

Quote:

Originally Posted by xjohnx

How difficult of an install are the subframe and diff inserts?

@phat 86 Installed my subframe and trans insert in less time than it took me to swap my header.

05-28-2013, 09:14 AM	#16
brillo Senior Member Join Date: Nov 2011 Drives: 2013 Firestorm FR-S Location: Houston Posts: 506 Thanks: 18 Thanked 77 Times in 64 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	going to install the subframe bushings and tranny mounts and see what improvements I get. I don't want the car vibrating at idle, but I think some stiffer bushings will help especially when launching the car or cornering hard. __________________ 2013 Firestorm FR-S, MTX, build date 1/13.

05-29-2013, 08:00 AM	#18
Ingen Senior Member Join Date: Oct 2012 Drives: Ultramarine FR-S 6MT Location: Columbus, OH Posts: 525 Thanks: 349 Thanked 204 Times in 121 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Sometimes when I let the clutch out and get on the gas it'll fee like it sort of lurches or jerks and then accelerates. I get the same thing if I lift, it sort of feels like a little impact. IS that caused by the weak-sauce bushings and motor mounts? What specifically should I change to fix that? This is my autocross toy but ALSO my daily driver, with 2 hours a day spent highway commuting. I need a happy medium here, if at all possible __________________ Car Received: 10/18. Break in ended: 10/28 Goal: Openflash UEL headers, Stage II 93 oct, TRD intake, arm rest :P

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05-27-2013, 12:11 PM	#15
TouchMyHonda Vtec Jesus Join Date: Jul 2012 Drives: 13 BRZ, 13 Golf R, 15 Audi S4 Location: LSD Posts: 1,165 Thanks: 623 Thanked 243 Times in 153 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Ditto

05-28-2013, 09:28 AM	#17
Mikem53 Senior Member Join Date: Apr 2013 Drives: FR-S 6MT Location: Somewhere in Space Posts: 1,565 Thanks: 500 Thanked 882 Times in 433 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Depends on what you put a priority on with this car.. When you add stiffer mounts to tighten up the driveline.. You will be transferring NVH to the cabin.. Everything is a compromise.. It's setup to be liveable on an everyday basis.. If it were my dedicated track toy.. I would be addressing some of the slack in the system..

05-29-2013, 10:57 AM	#21
RallySport Direct Join Date: Apr 2012 Drives: 2014 Widebody Cosworth FR-S Location: Salt Lake City, Utah Posts: 4,542 Thanks: 205 Thanked 1,198 Times in 554 Posts Mentioned: 38 Post(s) Tagged: 0 Thread(s)	We made this video which shows how much movement is in the rear diff. This will be Stock vs. the Cusco rear diff mount. [ame="http://youtu.be/10rspcW8uek"]http://youtu.be/10rspcW8uek[/ame] Myles at @Racecomp Engineering also speaks highly of the Whiteline Rear Diff Inserts, and I would agree with him. I think anything you can do to take up the slop is going to make a big difference. Thanks, Rick

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