How to fix wheel Hop - Page 5 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Calum · 08-28-2013, 11:13 PM

Quote:

Originally Posted by mike the snake

Do the subframe bushings move that much? In the under-car vid I watched, I could see the diff itself moving a BUNCH, but I couldn't see the subframe bushings move at all.

I know on my BMW 135i, it made a Huge difference, and was the first thing anyone did when improving the suspension. The 135i subframe moved over an inch with stock bushings, but the BRZ/FRS subframe I couldn't see it moving at all.

Take another look at the video. The subframe moves, it's no where near as much as the diff, but it does move.

Trackspeed_Nick · 09-24-2013, 10:21 AM

Not to bring up an old thread but there hasn’t seemed to be any sort of root cause of this issue.
I’m on a stock setup and like many it will hop like crazy in the damp with a spirited start. Watching that video on the first page it looked like the diff bushings were a major culprit in the play though someone in this thread said they replaced them and the subframe bushings to no avail.
I’d like to fix this issue but rather not just keep throwing different bushings under it and hoping for the best. I’m hoping it’s not a “sum of the parts” fix to this and it can be pointed to one flawed part.
Does anyone have any success stories in fixing this issue other than “moar throttle”? lol

Calum · 09-24-2013, 11:56 AM

I fear it will be a sum of the parts issue. You're trying to prevent the cyle of deflection, bind, unbind, deflect again. The only way your going to do that is to ensure everything will move to a point and then stay set, which to the best of my knowledge will require bushings with less movement then stock.

7thgear · 09-24-2013, 12:01 PM

Quote:

Originally Posted by Trackspeed_Nick

Does anyone have any success stories in fixing this issue other than “moar throttle”? lol

damp spirited start and you don't want to use moar throttle?

the only wheelhop i've experienced was in my FWD car... never once did i have it in my FRS, damp or no damp. Not sure what i'm doing differently?

troek · 09-24-2013, 04:51 PM

yeah no wheel hop for me either. have you guys tried not letting the wheels hop as much? that's what I do.

Tansey86 · 09-24-2013, 05:00 PM

Quote:

Originally Posted by troek

yeah no wheel hop for me either. have you guys tried not letting the wheels hop as much? that's what I do.

Brilliant. Don't let the wheels hop as much to prevent wheel hop.

SkAsphalt · 09-24-2013, 05:36 PM

You are all complaining about the FRS' wheel hop? Go drive a 1990's mustang. Wheels jumped up an down so hard under loaded cornering that my door came ajar.

Dipstik-sportech · 09-24-2013, 06:44 PM

Yes but that's a 90's ford with a solid axle. These cars do hop, I can watch my shifter move 3" and can feel the back end going all skittish. If I launch control in second it will just roast the tires, no hop. I wonder if first gear is just too low to allow adequate wheel speed to over come the hop.

No Limit Motorsport · 10-20-2013, 04:18 PM

I went to the drag strip for the first time with this car yesterday. Violent wheel hop and traction problems.

Current setup
1. 245/40 Hankook tires - 20psi
2. Fortune coilovers set middle damping setting
3. Whiteline transmission mount insert
4. Whiteline subframe bushings
5. Traction/VSC turned off by holding both buttons down
6. 295whp

Over the winter we want to build the motor and bring the power up to about 4-450 and do some drag radials to help with traction.

For this wheel hop problem I am going to try Cusco motor mounts (which makes a big difference on STI), Whiteline diff bushings. Not really sure where to go from there.

Anyone solve this issue yet?

Kostamojen · 10-20-2013, 10:20 PM

Hmm... what swaybars are people running while having thr wheel hop?

Dipstik-sportech · 10-21-2013, 06:37 AM

18mm hotchkiss, I'm going to try unhooking it at the track next year.

DougW · 10-21-2013, 10:23 AM

Anybody tried a non torsen diff and still had the chatter?
DougW

Mikepage · 10-21-2013, 10:55 AM

I think the best way to start is the subframe bushing and differential bushing.

But it's so difficult to fixe the wheel up completly with indenpendant suspension setup this car have.

My friend on a 350z fixe a lot of wheel up with installing differentiel alluminum bushing.

DylanFRS · 10-21-2013, 11:36 AM

Quote:

Originally Posted by OrbitalEllipses

I get this with damp roads, summer tires or winter tires doesn't matter. Watching the shifter rattle violently...is disconcerting.

Oh man, I know this specific post is ancient but I finally got around to reading this thread. The shifter thing really had me worried. I was going to ask on the forum but I was afraid of the answer. Glad to know that it is from the wheel hop in the damp.

09-24-2013, 06:44 PM	#64
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	Yes but that's a 90's ford with a solid axle. These cars do hop, I can watch my shifter move 3" and can feel the back end going all skittish. If I launch control in second it will just roast the tires, no hop. I wonder if first gear is just too low to allow adequate wheel speed to over come the hop. __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

10-20-2013, 04:18 PM	#65
No Limit Motorsport Senior Member Join Date: Jul 2012 Drives: 2013 DGM BRZ Location: Long Island, NY Posts: 2,266 Thanks: 355 Thanked 406 Times in 228 Posts Mentioned: 27 Post(s) Tagged: 0 Thread(s)	I went to the drag strip for the first time with this car yesterday. Violent wheel hop and traction problems. Current setup 1. 245/40 Hankook tires - 20psi 2. Fortune coilovers set middle damping setting 3. Whiteline transmission mount insert 4. Whiteline subframe bushings 5. Traction/VSC turned off by holding both buttons down 6. 295whp Over the winter we want to build the motor and bring the power up to about 4-450 and do some drag radials to help with traction. For this wheel hop problem I am going to try Cusco motor mounts (which makes a big difference on STI), Whiteline diff bushings. Not really sure where to go from there. Anyone solve this issue yet? Last edited by No Limit Motorsport; 10-21-2013 at 06:04 PM.

10-21-2013, 06:37 AM	#67
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	18mm hotchkiss, I'm going to try unhooking it at the track next year. __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

10-21-2013, 10:55 AM	#69
Mikepage Senior Member Join Date: Oct 2012 Drives: Scion FR-S 2013 Raven Location: Canada Posts: 690 Thanks: 380 Thanked 186 Times in 103 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	I think the best way to start is the subframe bushing and differential bushing. But it's so difficult to fixe the wheel up completly with indenpendant suspension setup this car have. My friend on a 350z fixe a lot of wheel up with installing differentiel alluminum bushing. __________________ *o= FR-S =o* Last edited by Mikepage; 10-21-2013 at 01:24 PM.

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09-24-2013, 10:21 AM	#58
Trackspeed_Nick Junior Member Join Date: Sep 2013 Drives: Scion FR-S, MK1 MR2 Location: Ocala, FL Posts: 5 Thanks: 0 Thanked 2 Times in 2 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Not to bring up an old thread but there hasn’t seemed to be any sort of root cause of this issue. I’m on a stock setup and like many it will hop like crazy in the damp with a spirited start. Watching that video on the first page it looked like the diff bushings were a major culprit in the play though someone in this thread said they replaced them and the subframe bushings to no avail. I’d like to fix this issue but rather not just keep throwing different bushings under it and hoping for the best. I’m hoping it’s not a “sum of the parts” fix to this and it can be pointed to one flawed part. Does anyone have any success stories in fixing this issue other than “moar throttle”? lol

09-24-2013, 11:56 AM	#59
Calum That Guy Join Date: Dec 2011 Drives: 2013 asphalt FRS MT Location: Halifax, Nova Scotia Posts: 4,865 Thanks: 5,058 Thanked 2,868 Times in 1,499 Posts Mentioned: 82 Post(s) Tagged: 1 Thread(s)	I fear it will be a sum of the parts issue. You're trying to prevent the cyle of deflection, bind, unbind, deflect again. The only way your going to do that is to ensure everything will move to a point and then stay set, which to the best of my knowledge will require bushings with less movement then stock.

10-20-2013, 10:20 PM	#66
Kostamojen Senior Member Join Date: Oct 2011 Drives: 1993 Impreza w/ WRX Swap + FWD! Location: Roseville, CA Posts: 2,071 Thanks: 217 Thanked 952 Times in 500 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Hmm... what swaybars are people running while having thr wheel hop?

10-21-2013, 10:23 AM	#68
DougW Senior Member Join Date: May 2013 Drives: FR-S stock for now Location: SC Posts: 160 Thanks: 3 Thanked 171 Times in 81 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Anybody tried a non torsen diff and still had the chatter? DougW

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