Weird wobble on acceleration - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ReaperX43 · 09-25-2014, 03:17 PM

since I got my car, when i accelerate from a dead stop (gentle acceleration), something in the back feels like its wobbling/rumbling/low frequency vibration. I'm not sure if that is normal maybe because of the automatic transmission or the LSD or if there is something actually wrong with it. anyone have any input?

Thank You

BRZBot · 09-25-2014, 03:36 PM

Is it when the car is just warming up or all the time? My auto does it on the first turn out of my neighborhood in the morning but that's it.

tyrantcf · 09-25-2014, 03:39 PM

My car seems to do it when cold, I have the 6MT. I always thought this was attributed to the LSD

ReaperX43 · 09-25-2014, 04:16 PM

Yeah its usualy my first turn, but I usually warm up the car till it idles to sub 1000 rpm though. But you guys think that it is normal? At least I'm not the only one that is experiencing this.

Gords_zenith · 09-25-2014, 04:48 PM

It's IMO normal. I've noticed this too, but it goes away after a few mins. I think these tires are very susceptible to temperature variations and will very minimally flat spot causing a vibration and wobble. Also, if you warm your car up, you're only warming the engine fluids until you actually start driving.

ReaperX43 · 09-25-2014, 05:09 PM

Thanks for the input its greatly appreciated

pushrod · 09-25-2014, 07:40 PM

It's the diff.

Tcoat · 09-25-2014, 08:24 PM

Quote:

Originally Posted by tyrantcf

My car seems to do it when cold, I have the 6MT. I always thought this was attributed to the LSD

What he said!

fatalelement · 10-04-2014, 12:15 AM

As others said, it's the diff. When I pull out of my neighborhood in the morning (about 15 seconds from my driveway), I make a right turn slightly uphill onto a major boulevard and it always seems like it's struggling to transmit drive evenly despite the fact that I ease it out well under 2k rpm and I do it slowly. It goes away within a minute or two.

But for what it's worth, you aren't crazy. This bothered me for a bit too until I talked to some people about it.

Ultramaroon · 10-04-2014, 12:56 AM

Quote:

Originally Posted by pushrod

It's the diff.

this. google torsen lsd. you want it because racecar.

Tcoat · 10-04-2014, 01:04 AM

Quote:

Originally Posted by Ultramaroon

this. google torsen lsd. you want it because racecar.

I googled LSD and although I think it may indeed make you have a weird wobble the site said there would be other effects as well! Don't think it be a god idea while driving either race car or not.

fatalelement · 10-04-2014, 01:06 AM

Quote:

Originally Posted by Ultramaroon

this. google torsen lsd. you want it because racecar.

http://jalopnik.com/how-to-build-a-d...the-1516627252

The title of this edition of their drift car build is "Weld the Diff, Yo!"

I think it would fix the problem entirely!

Ultramaroon · 10-04-2014, 01:31 AM

Quote:

Originally Posted by fatalelement

http://jalopnik.com/how-to-build-a-d...the-1516627252

The title of this edition of their drift car build is "Weld the Diff, Yo!"

I think it would fix the problem entirely!

Ultramaroon · 10-04-2014, 01:38 AM

Quote:

Originally Posted by Tcoat

I googled LSD and although I think it may indeed make you have a weird wobble the site said there would be other effects as well! Don't think it be a god idea while driving either race car or not.

you get some too

09-25-2014, 03:17 PM	#1
ReaperX43 Member Join Date: Aug 2014 Drives: White Limited Brz 2014 Location: North Carolina Posts: 20 Thanks: 2 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Weird wobble on acceleration since I got my car, when i accelerate from a dead stop (gentle acceleration), something in the back feels like its wobbling/rumbling/low frequency vibration. I'm not sure if that is normal maybe because of the automatic transmission or the LSD or if there is something actually wrong with it. anyone have any input? Thank You

09-25-2014, 03:39 PM	#3
tyrantcf Senior Member Join Date: Apr 2014 Drives: '16 WRX, CBR1000RR Location: Bakersfield, CA Posts: 560 Thanks: 422 Thanked 369 Times in 213 Posts Mentioned: 18 Post(s) Tagged: 1 Thread(s)	My car seems to do it when cold, I have the 6MT. I always thought this was attributed to the LSD __________________ Phantom ESC'd Build Thread (Retired):http://www.ft86club.com/forums/showthread.php?t=75293

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09-25-2014, 03:36 PM	#2
BRZBot Member Join Date: Sep 2014 Drives: WRB BRZ Limited Location: Kentucky Posts: 43 Thanks: 0 Thanked 35 Times in 18 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Is it when the car is just warming up or all the time? My auto does it on the first turn out of my neighborhood in the morning but that's it.

09-25-2014, 04:16 PM	#4
ReaperX43 Member Join Date: Aug 2014 Drives: White Limited Brz 2014 Location: North Carolina Posts: 20 Thanks: 2 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Yeah its usualy my first turn, but I usually warm up the car till it idles to sub 1000 rpm though. But you guys think that it is normal? At least I'm not the only one that is experiencing this.

09-25-2014, 04:48 PM	#5
Gords_zenith Senior Member Join Date: Nov 2012 Drives: WRB BRZ Sport Tech Location: Durham, Canada Posts: 354 Thanks: 178 Thanked 110 Times in 64 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	It's IMO normal. I've noticed this too, but it goes away after a few mins. I think these tires are very susceptible to temperature variations and will very minimally flat spot causing a vibration and wobble. Also, if you warm your car up, you're only warming the engine fluids until you actually start driving.

09-25-2014, 05:09 PM	#6
ReaperX43 Member Join Date: Aug 2014 Drives: White Limited Brz 2014 Location: North Carolina Posts: 20 Thanks: 2 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks for the input its greatly appreciated

09-25-2014, 07:40 PM	#7
pushrod Benched 86lb Join Date: Jul 2014 Drives: Ultramarine FR-S Location: Ottawa Posts: 806 Thanks: 899 Thanked 928 Times in 393 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	It's the diff.

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