Rear end shaking under acceleration - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

enjoyminutemaid · 10-19-2013, 09:36 PM

Hi all, I've noticed that when I start from a stop in first gear at a slow to moderate pace, sometimes the rear end will shake and sort of hop. The wheels don't hop, and I don't lose traction. It is more noticeable when I have the wheel turned, so I'm wondering if it has something to do with the differential. Anyone else notice this?

ThaBigUnit · 10-19-2013, 09:57 PM

No

Young_makaveli · 10-19-2013, 10:03 PM

Im afraid That this does not occur for me

TurboBrett · 10-21-2013, 01:26 PM

I notice this, yes, and can sometimes hear it as well.
See if any of this sounds like your issue:
http://www.ft86club.com/forums/showthread.php?t=45641

EDIT: Only on cold start and only for a turns.

Raiin · 10-22-2013, 01:28 AM

Also noticed this and have wondered; can't reproduce it on a consistent basis...but it is more common then I would prefer.

LeeMaster · 10-22-2013, 01:54 AM

Mines never shake, but makes a loud pop/thunk when I turn the wheel all the way and start moving from idle.

Suberman · 10-22-2013, 10:01 AM

If a tire begins to slip at slow speeds you may get a sensation of wheel hop. That's the way Torsen diffs work. This happens more frequently in slow speed corners. The slower and tighter the corner the more you will notice this. Most of this effect occurs in first gear.

The effect can even trigger the flashing yellow light on the traction control when no traction control is required.

Foobar · 10-22-2013, 10:41 AM

Try it with the nannies off? Just wondering if you're getting some wheel spin and the nannies are kicking in oddly leading to a hopping type of feel.

enjoyminutemaid · 04-12-2014, 10:51 PM

Bringing this thread back from the dead. I still get this all of the time, but only when the wheel is turned and I'm starting out from a stop. It's fairly violent though, and it feels like the rear diff is acting in a way it shouldn't. I will try to film it and set if I can get a noise. It is NOT simply the rear tires skipping, though it may be related, and it definitely reminds me of wheel hop.

BRZnut · 04-12-2014, 11:16 PM

I get this every day in the am when leaving our street first thing in the morning, but is not "violent"

Ozzman · 04-12-2014, 11:39 PM

It's your limited slip differential doing it's thing. How many miles do you have on the car?

enjoyminutemaid · 04-13-2014, 11:46 AM

Quote:

Originally Posted by Ozzman

It's your limited slip differential doing it's thing. How many miles do you have on the car?

35k miles.

Is there no way to change things so that instead of the shaking, it just spins tires (other than launching)? I wouldn't mind that...

Gords_zenith · 04-13-2014, 12:14 PM

Sounds like it's binding....aka my ford ranger fx4 has a LSD-clutch style though and without a friction modifier it will do the same thing you're describing, but in saying that we have a torsen(frs/brz) so it's not really related. My guess; it sounds like the fluid is too low or has gone bad! I would get them to change the diff fluid at the dealer and go from there but if it's still doing it then write down the conditions it's happening and get the tech to replicate it exactly as yor noticing it. That way you might have a better shot at getting it warranties should something be wrong mechanically. Good luck

Ozzman · 04-13-2014, 04:50 PM

If you havn't changed your fluid yet do so.

10-19-2013, 09:36 PM	#1
enjoyminutemaid Senior Member Join Date: Jun 2012 Drives: Subaru BRZ Limited WRB Manual Location: RI/MA Posts: 212 Thanks: 185 Thanked 46 Times in 29 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Rear end shaking under acceleration Hi all, I've noticed that when I start from a stop in first gear at a slow to moderate pace, sometimes the rear end will shake and sort of hop. The wheels don't hop, and I don't lose traction. It is more noticeable when I have the wheel turned, so I'm wondering if it has something to do with the differential. Anyone else notice this?

10-22-2013, 01:54 AM	#6
LeeMaster Red wine Join Date: Oct 2012 Drives: Subaru BRZ(R.I.P) Location: Denied Posts: 1,176 Thanks: 1,268 Thanked 342 Times in 240 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Mines never shake, but makes a loud pop/thunk when I turn the wheel all the way and start moving from idle. __________________

04-13-2014, 12:14 PM	#13
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)	Sounds like it's binding....aka my ford ranger fx4 has a LSD-clutch style though and without a friction modifier it will do the same thing you're describing, but in saying that we have a torsen(frs/brz) so it's not really related. My guess; it sounds like the fluid is too low or has gone bad! I would get them to change the diff fluid at the dealer and go from there but if it's still doing it then write down the conditions it's happening and get the tech to replicate it exactly as yor noticing it. That way you might have a better shot at getting it warranties should something be wrong mechanically. Good luck Last edited by Gords_zenith; 04-13-2014 at 02:06 PM.

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10-19-2013, 09:57 PM	#2
ThaBigUnit Awesome Member! Join Date: May 2012 Drives: 2013 Scion FR-S (Asphalt) Location: Orange County, Ca Posts: 219 Thanks: 44 Thanked 138 Times in 56 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	No

10-19-2013, 10:03 PM	#3
Young_makaveli Senior Member Join Date: Aug 2013 Drives: 2013 frs Location: Montreal Posts: 712 Thanks: 181 Thanked 88 Times in 77 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Im afraid That this does not occur for me

10-21-2013, 01:26 PM	#4
TurboBrett Member Join Date: Jan 2013 Drives: 13 BRZ Location: The matrix Posts: 79 Thanks: 9 Thanked 15 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I notice this, yes, and can sometimes hear it as well. See if any of this sounds like your issue: http://www.ft86club.com/forums/showthread.php?t=45641 EDIT: Only on cold start and only for a turns.

10-22-2013, 01:28 AM	#5
Raiin Member Join Date: Aug 2013 Drives: 2013 Scion FR-S 10 Series Location: Southern Alberta Posts: 23 Thanks: 2 Thanked 5 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Also noticed this and have wondered; can't reproduce it on a consistent basis...but it is more common then I would prefer.

10-22-2013, 10:01 AM	#7
Suberman Banned Join Date: Jul 2013 Drives: Subaru BRZ Sport Tech Satin White Location: Calgary, Alberta,Canada Posts: 1,228 Thanks: 147 Thanked 320 Times in 225 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	If a tire begins to slip at slow speeds you may get a sensation of wheel hop. That's the way Torsen diffs work. This happens more frequently in slow speed corners. The slower and tighter the corner the more you will notice this. Most of this effect occurs in first gear. The effect can even trigger the flashing yellow light on the traction control when no traction control is required.

04-12-2014, 10:51 PM	#9
enjoyminutemaid Senior Member Join Date: Jun 2012 Drives: Subaru BRZ Limited WRB Manual Location: RI/MA Posts: 212 Thanks: 185 Thanked 46 Times in 29 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Bringing this thread back from the dead. I still get this all of the time, but only when the wheel is turned and I'm starting out from a stop. It's fairly violent though, and it feels like the rear diff is acting in a way it shouldn't. I will try to film it and set if I can get a noise. It is NOT simply the rear tires skipping, though it may be related, and it definitely reminds me of wheel hop.

04-12-2014, 11:16 PM	#10
BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	I get this every day in the am when leaving our street first thing in the morning, but is not "violent"

04-12-2014, 11:39 PM	#11
Ozzman Senior Member Join Date: Mar 2013 Drives: old Location: Roswell Posts: 232 Thanks: 188 Thanked 103 Times in 59 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	It's your limited slip differential doing it's thing. How many miles do you have on the car?

04-13-2014, 04:50 PM	#14
Ozzman Senior Member Join Date: Mar 2013 Drives: old Location: Roswell Posts: 232 Thanks: 188 Thanked 103 Times in 59 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	If you havn't changed your fluid yet do so.

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