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

jordanrw260 · 05-10-2013, 08:03 PM

OK this is not a problem or issue, I'm sure the average driver will not notice this but I will describe what I experience in hopes that someone else has noticed and could point me to maybe a part to tighten things up.

Example: When driving a constant 50MPH on the highway with your foot already on the gas, if you let off you can feel a small amount of movement in the drive train below you. And if you let off right there and press the gas again to resume maintaining that 50MPH you will again feel the movement beneath you. It just feels like there is some slack somewhere.

Is this something where a transmission collar is needed for extra support to minimize the movement?

Xero-Limit · 05-10-2013, 08:09 PM

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.

86drift · 05-10-2013, 09:02 PM

I have this too. Most of the slack is in the diff. But there's also some in the CVs.

Don't know if there's a lot you can do about it.

jordanrw260 · 05-10-2013, 09:24 PM

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.

Can you tell me which item numbers you a referencing from the whiteline homepage? http://www.whiteline.com.au/do_segue...ehicle=2012-ON

Captain Snooze · 05-10-2013, 09:33 PM

Quote:

Originally Posted by moto-mike

Huge issue on this car.

With due respect I beg to differ. I do not know what it is the OP is referring to. Let me rephrase that. I know what it is he is referring to just that I have never been aware of this "problem". Even the OP states "small amount".

MY13FRS · 05-10-2013, 09:41 PM

Quote:

Originally Posted by jordanrw260

OK this is not a problem or issue, I'm sure the average driver will not notice this but I will describe what I experience in hopes that someone else has noticed and could point me to maybe a part to tighten things up.

Example: When driving a constant 50MPH on the highway with your foot already on the gas, if you let off you can feel a small amount of movement in the drive train below you. And if you let off right there and press the gas again to resume maintaining that 50MPH you will again feel the movement beneath you. It just feels like there is some slack somewhere.

Is this something where a transmission collar is needed for extra support to minimize the movement?

Yup, I had to adjust my driving style for this car. You have to let go of the clutch quick, like you're dumping the clutch, and add throttle. Takes practice, but once you got it, it works. You can't feather the clutch on this car.

mrk1 · 05-10-2013, 09:47 PM

I completely agree with the slop being a problem. On my car I have installed the Whiteline rear subframe inserts (kdt922) and also installed STI engine and trans mounts. It makes a world of difference.

Diff mounts will be soon.

mswhong · 05-11-2013, 05:44 AM

Yes, I have this issue on my car as well.. the drivetrain slop in this car is terrible but with some bushings and other products (from whiteline or any other company) it should go away

Captain Snooze · 05-11-2013, 07:05 AM

Could someone please explain what this drivetrain slop is? I really don't know what the complaint is.

mswhong · 05-11-2013, 07:35 AM

Quote:

Originally Posted by Captain Snooze

Could someone please explain what this drivetrain slop is? I really don't know what the complaint is.

It's just the drivetrain moving when taking your foot on off the gas.. It's not very pronounced but you can definitely replicate it.

It's similar to when you're driving along a road that has a few bumps and the revs sort of bounce around due to the transmission moving about laterally and longitudinally.

Captain Snooze · 05-11-2013, 08:22 AM

The problem I have with bumpy roads is trying to keep a constant throttle. That is my foot on the throttle gets bumped around. I think the throttle spring is too light.
(Sorry, off topic)

Bu-Tang · 05-11-2013, 01:16 PM

[QUOTE=moto-mike;925858]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 tighten

Agreed, I went white Whiteline KDT926/Perrin combo + KDT925, HUGE difference, the issue was driving me insane for a while until U I installed all of them.

SkullWorks · 05-11-2013, 01:36 PM

You can definitely feel the drivetrain moving around in this car,

It bothers me considerably but I was thinking it only felt so pronounced because I was trying to compare it to my 240 with solid mounted everything and a one-piece driveshaft. In reality it is no worse than any other car, I think the reason so many people DO notice it in this car is the overall characteristic of the car is to be tight, and the drivetrain slop seems a bit out of character for the car, I wouldn't be surprised if the factory left a bit extra in so they could sell us stiffer mounts...ala STi (does TRD offer mounts yet?)

I need to finish my coffee

Turdinator · 05-13-2013, 01:19 AM

TRD are doing a range of stiffer bushesfor the 86.
http://www.trdparts.jp/english/86_pe...atestnews.html

And i definitely agree there is a lot of driveline slop in this car.

05-10-2013, 09:47 PM	#7
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 20 Post(s) Tagged: 2 Thread(s)	I completely agree with the slop being a problem. On my car I have installed the Whiteline rear subframe inserts (kdt922) and also installed STI engine and trans mounts. It makes a world of difference. Diff mounts will be soon. __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

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05-10-2013, 08:09 PM	#2
Xero-Limit Join Date: Nov 2012 Drives: JDL Turbo FRS, 335SC BRZ (ret) Location: Lehigh Valley, PA Posts: 932 Thanks: 368 Thanked 1,547 Times in 525 Posts Mentioned: 380 Post(s) Tagged: 6 Thread(s)	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.

05-10-2013, 09:02 PM	#3
86drift Join Date: Jun 2012 Drives: Toyota 86 GT Location: Sydney, Australia Posts: 517 Thanks: 85 Thanked 263 Times in 147 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	I have this too. Most of the slack is in the diff. But there's also some in the CVs. Don't know if there's a lot you can do about it.

05-11-2013, 05:44 AM	#8
mswhong Senior Member Join Date: Oct 2012 Drives: FT86 Location: AUS Posts: 253 Thanks: 83 Thanked 64 Times in 45 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Yes, I have this issue on my car as well.. the drivetrain slop in this car is terrible but with some bushings and other products (from whiteline or any other company) it should go away

05-11-2013, 07:05 AM	#9
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,720 Thanks: 3,993 Thanked 9,339 Times in 4,125 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	Could someone please explain what this drivetrain slop is? I really don't know what the complaint is.

05-11-2013, 08:22 AM	#11
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,720 Thanks: 3,993 Thanked 9,339 Times in 4,125 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	The problem I have with bumpy roads is trying to keep a constant throttle. That is my foot on the throttle gets bumped around. I think the throttle spring is too light. (Sorry, off topic)

05-11-2013, 01:16 PM	#12
Bu-Tang Senior Member Join Date: May 2012 Drives: 2013 Scion FR-S, Nissan Pathfinder Location: Calgary AB, Canada Posts: 404 Thanks: 189 Thanked 212 Times in 96 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	[QUOTE=moto-mike;925858]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 tighten Agreed, I went white Whiteline KDT926/Perrin combo + KDT925, HUGE difference, the issue was driving me insane for a while until U I installed all of them.

05-11-2013, 01:36 PM	#13
SkullWorks Banned Join Date: Mar 2012 Drives: SSM LT MT BRZ Location: SoCal Posts: 1,033 Thanks: 803 Thanked 754 Times in 328 Posts Mentioned: 23 Post(s) Tagged: 1 Thread(s)	You can definitely feel the drivetrain moving around in this car, It bothers me considerably but I was thinking it only felt so pronounced because I was trying to compare it to my 240 with solid mounted everything and a one-piece driveshaft. In reality it is no worse than any other car, I think the reason so many people DO notice it in this car is the overall characteristic of the car is to be tight, and the drivetrain slop seems a bit out of character for the car, I wouldn't be surprised if the factory left a bit extra in so they could sell us stiffer mounts...ala STi (does TRD offer mounts yet?) I need to finish my coffee

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