Wheel hops , vibrates over small bumps in road
10-31-17, 04:27 PM
#1
Wheel hops , vibrates over small bumps in road
So the problem is litteraly going over little bumps imperfections on the roads. Cracks ,, tiny potholes and what not . Any speed
slow speed it feels like the wheel haves no dampening . Solid stiff . High speed it justs amplifise.
for the pass 6 months. I have replaced all bushings to superpro and diff busbings. New pillow *****. Oem new inner lower congrol arm bushing. And new Ohlins DFV along with new toe link trailing arms.
im out of ideas. Its driving me crazy like the rear end is about to fall apart. I looked at the sway bar bushings. Its present and looks good. End links look like its solid. No play.
bad bearing? Axle ?
slow speed it feels like the wheel haves no dampening . Solid stiff . High speed it justs amplifise.
for the pass 6 months. I have replaced all bushings to superpro and diff busbings. New pillow *****. Oem new inner lower congrol arm bushing. And new Ohlins DFV along with new toe link trailing arms.
im out of ideas. Its driving me crazy like the rear end is about to fall apart. I looked at the sway bar bushings. Its present and looks good. End links look like its solid. No play.
bad bearing? Axle ?
10-31-17, 08:29 PM
#4
could alignment cause that ? Ive done alignmemt before i even touched anything.. changed from 18s to 16 stockers with new tires . Alignment.. same .. gone through entire suspension with new things. Alignment. Same .. both times spec is same as stock requires
11-01-17, 07:22 PM
#7
It was on tokico when i bought the car awhile back
im comparing to FDs with all range of suspension. From stock to equivalent setup.
2 same FD with same set up down to the tires. Down the same road have not the same feel. The rear wheel feel like its only 5lbs and slaping up and down as im going over little bumps/steps
while the other fd just feels like any normal car would . Damping and bouncing .. absorbing the shocks coming from the pavement.
hard to describe with words. Ill try to get videos. Either slow motion or ubdercar footage. Thanks for everyones time !
im comparing to FDs with all range of suspension. From stock to equivalent setup.
2 same FD with same set up down to the tires. Down the same road have not the same feel. The rear wheel feel like its only 5lbs and slaping up and down as im going over little bumps/steps
while the other fd just feels like any normal car would . Damping and bouncing .. absorbing the shocks coming from the pavement.
hard to describe with words. Ill try to get videos. Either slow motion or ubdercar footage. Thanks for everyones time !
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11-02-17, 10:07 AM
#9
I guess I'm a little confused by your descriptions. You mention it feels super stiff and you can feel every little bump or crack which would lead me to think you are having binding problems. Then you mention it feels like the rear wheels weigh nothing and are slapping up and down which would imply you are getting no damping from your Ohlins. I'm guessing that what LOF mentioned above is probably what's happening but I think if you could clarify a little more whether you feel like the wheels are not moving at all over bumps or whether it feels like they are moving a lot with no resistance.
11-03-17, 02:33 AM
#10
Im so sorry if my explanation is a little confusing. Im confused as well. I am well aware what coilovers feel like and know what to expect when riding on stiff suspension but this issue is entirely another beast
i took it to J-auto . A suspension shop im sure most of you guys know of
anyways. We checked. Tighness on the toelink. Trailing arms. All new btw. New pillow ball bushings. Checked that and its still solid like new. Triple checked the preload on the DFV.
shock nut tight. Tower nuts tight. Every rear component is tight aswell. Bushing for sway bar are new. Endlink haves no play.
diff bushings are new and tight aswell.
after he test drove it. He knew what i was describing and could finally understand what im saying. There is issue and its nothing like hes ever seen. And juan at jauto has done many car and set up many different suspensions. His words : feels like the wheel is floating and feels like somthing is loose when at low speed going over bumps. Like the wheels about to fall off . It feels more severe then just a busted pillow ball
next week we are going to replace every part that moves in the rear 1 by 1 till we isolate the problem. And swap out to stock suspension and see if it gose away. If it does. Then im the lucky bastard that got defective new ohlins that needs revalving
i took it to J-auto . A suspension shop im sure most of you guys know of
anyways. We checked. Tighness on the toelink. Trailing arms. All new btw. New pillow ball bushings. Checked that and its still solid like new. Triple checked the preload on the DFV.
shock nut tight. Tower nuts tight. Every rear component is tight aswell. Bushing for sway bar are new. Endlink haves no play.
diff bushings are new and tight aswell.
after he test drove it. He knew what i was describing and could finally understand what im saying. There is issue and its nothing like hes ever seen. And juan at jauto has done many car and set up many different suspensions. His words : feels like the wheel is floating and feels like somthing is loose when at low speed going over bumps. Like the wheels about to fall off . It feels more severe then just a busted pillow ball
next week we are going to replace every part that moves in the rear 1 by 1 till we isolate the problem. And swap out to stock suspension and see if it gose away. If it does. Then im the lucky bastard that got defective new ohlins that needs revalving
11-03-17, 09:08 AM
#11
Do FDs have similar sway bar end link binding problems like the FCs have when you lower the car and stiffen every bushing and mount in the rear? Otherwise yeah I would think your Ohlins are suspect at this point... Would be interesting to put them on a shock dyno and see what that shows
11-03-17, 10:31 AM
#12
I thought it was my endlinks binding up aswell. We disconnected the sway bar and drove around. Problem still the same
at this point. Im swaping to stock suspension and see if the issue is still there , and than cross test with another set of ohlins and teins ss coilovers
If it is a legitimate valving issue. Apon testing and revalving ill get a before and after dyno sheet for it and show you guys
at this point. Im swaping to stock suspension and see if the issue is still there , and than cross test with another set of ohlins and teins ss coilovers
If it is a legitimate valving issue. Apon testing and revalving ill get a before and after dyno sheet for it and show you guys
11-20-17, 10:30 PM
#13
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does the rear of the car feel like someone is grabbing it and shaking it up and down really fast? that what mine felt like over 100mph in mine with a 11/11 set up. I swapped to a 8/6 set up and it felt great after that. I am now running a 11/8 and it doesn't do that anymore like the 11/11. Perhaps try a softer rear spring just to try it out?
I have ohlins dfv on the rx8 and it feels great with the stock 9/6 set up I have.
I have ohlins dfv on the rx8 and it feels great with the stock 9/6 set up I have.
11-26-17, 11:32 PM
#14
Banned. I got OWNED!!!
So the problem is litteraly going over little bumps imperfections on the roads. Cracks ,, tiny potholes and what not . Any speed
slow speed it feels like the wheel haves no dampening . Solid stiff . High speed it justs amplifise.
for the pass 6 months. I have replaced all bushings to superpro and diff busbings. New pillow *****. Oem new inner lower congrol arm bushing. And new Ohlins DFV along with new toe link trailing arms.
im out of ideas. Its driving me crazy like the rear end is about to fall apart. I looked at the sway bar bushings. Its present and looks good. End links look like its solid. No play.
bad bearing? Axle ?
slow speed it feels like the wheel haves no dampening . Solid stiff . High speed it justs amplifise.
for the pass 6 months. I have replaced all bushings to superpro and diff busbings. New pillow *****. Oem new inner lower congrol arm bushing. And new Ohlins DFV along with new toe link trailing arms.
im out of ideas. Its driving me crazy like the rear end is about to fall apart. I looked at the sway bar bushings. Its present and looks good. End links look like its solid. No play.
bad bearing? Axle ?
12-23-17, 09:24 PM
#16
Problem solved. After 8 months. End up being a binding trailing arm bushing . And yes. It was brand new. Got the maker to put new rod ends on it and problem gone. Smooth butter ride on revalved ohlins DFV. City driving,, check,, track hero,,, check.
12-24-17, 01:44 AM
#17
^^ Only place you can put Poly on rear of FD is the Upper a-arm inner positions and shock lower mount. Everything else is multi-axis and Poly will cause binding.
Please spread the word and see if we can stop vendors from selling parts that are dangerous and decrease performance.
Please spread the word and see if we can stop vendors from selling parts that are dangerous and decrease performance.
12-24-17, 08:29 PM
#18
Banned. I got OWNED!!!
^^ Only place you can put Poly on rear of FD is the Upper a-arm inner positions and shock lower mount. Everything else is multi-axis and Poly will cause binding.
Please spread the word and see if we can stop vendors from selling parts that are dangerous and decrease performance.
Please spread the word and see if we can stop vendors from selling parts that are dangerous and decrease performance.
What are your rebound settings at for these Ohlins? You're WAY too high and hitting the "knee" of the damping curve between 0-1 inch/s which you shouldn't.
12-24-17, 10:14 PM
#19
^^ Only place you can put Poly on rear of FD is the Upper a-arm inner positions and shock lower mount. Everything else is multi-axis and Poly will cause binding.
Please spread the word and see if we can stop vendors from selling parts that are dangerous and decrease performance.
Please spread the word and see if we can stop vendors from selling parts that are dangerous and decrease performance.
12-24-17, 10:16 PM
#20
x2. Polyurethane really should never be on suspension bits. It creeps and becomes useless with any proper driving.
What are your rebound settings at for these Ohlins? You're WAY too high and hitting the "knee" of the damping curve between 0-1 inch/s which you shouldn't.
What are your rebound settings at for these Ohlins? You're WAY too high and hitting the "knee" of the damping curve between 0-1 inch/s which you shouldn't.
all my problem is solved with new bushings on the trailing arm.
i did have my dfv revalved to different damping curves. I do not have the graph with me atm. But once i dug it up ill upload it
03-08-18, 03:48 AM
#22
Senior Member
Shocking experience. Was getting like hard hits going over medium bumps at speed. Turns out my high mileage stock 93 FD had a front shock absorber frozen in place. Replaced front coilovers and all seems to be well.