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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.

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Old 05-10-2013, 07:03 PM   #1
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Question Drivetrain slop?

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?
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Old 05-10-2013, 07:09 PM   #2
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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.
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Old 05-10-2013, 08:02 PM   #3
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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.
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Old 05-10-2013, 08:24 PM   #4
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Quote:
Originally Posted by moto-mike View Post
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
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Old 05-10-2013, 08:33 PM   #5
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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".
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Old 05-10-2013, 08:41 PM   #6
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Originally Posted by jordanrw260 View Post
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.
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Old 05-10-2013, 08:47 PM   #7
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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.
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Old 05-11-2013, 04:44 AM   #8
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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
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Old 05-11-2013, 06:05 AM   #9
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Could someone please explain what this drivetrain slop is? I really don't know what the complaint is.
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Old 05-11-2013, 06:35 AM   #10
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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.
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Old 05-11-2013, 07:22 AM   #11
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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)
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Old 05-11-2013, 12:16 PM   #12
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[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.
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Old 05-11-2013, 12:36 PM   #13
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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?)


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Old 05-13-2013, 12:19 AM   #14
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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.
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Old 05-27-2013, 11:11 AM   #15
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Ditto
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Old 05-28-2013, 08:14 AM   #16
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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.
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Old 05-28-2013, 08:28 AM   #17
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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..
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Old 05-29-2013, 07:00 AM   #18
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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
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Old 05-29-2013, 07:55 AM   #19
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Originally Posted by moto-mike View Post
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?
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Old 05-29-2013, 08:50 AM   #20
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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.
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Old 05-29-2013, 09:57 AM   #21
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We made this video which shows how much movement is in the rear diff. This will be Stock vs. the Cusco rear diff mount.



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,
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Old 05-29-2013, 10:46 AM   #22
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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.
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