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Old 08-10-2014, 12:30 PM   #1
rymaggi
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Default Steering wheel vibration highway

Info on the car.

V7 jdm sti drivetrain

17x9 rpf1's 245/40 direzzi z2's

10mm spacer upfront to clear brembos

Whiteline steering rack bushings

ALK Kit

RCA Kit

6.5 caster
2.0 camber F
1.5 camber R

*Toe was done to help with turn in and also help with understeer*

Tires are new only 6 months of use

Wheels balanced at les Schwab

Corner balanced and aligned

So first things first, I had a HUGE steering wheel vibrations at anything higher than 60mph, and i mean a nasty vibration. The power steering would also cut out during normal driving. So my first thought was had to be the power steering pump.

Purchased and OEM pump from subaru, had it installed. Fixed the power steering problem but did not fix the high speed vibrations. It helped it but it's still there and it doesn't feel like the steering wheel is going to fall off anymore on the freeway, but it still shakes.

The guys that did the alignment are very good with setting up cars, they do all the work for my buddies autoX car that's sponsored by grimmspeed so I trusted them on their suggestion to play with the toe, but I feel like it could be causing the shaking.

Sometimes on the freeway, it won't be there for a few seconds. Then it comes on, sometimes mild, sometimes a little worse. Driving around town it's fine.

I'm not sure of the exact numbers on the toe, as soon as I get off work I'm going to try and locate the paperwork.

Monday I plan on having the wheels re balanced, and the toe zero'd out and see if it cures the problem

If anyone has any input, or suggestions for things to check please chime in.




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Old 08-10-2014, 01:49 PM   #2
breakablecookie
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Sounds to me like the wheels might just be out of balance. Maybe a weight managed to fall off while driving.

If you have the ability you should get under the car and visually inspect all 4 corners. See if maybe you have a bad CV joint/boot or maybe a worn out bushing.
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Old 08-10-2014, 03:37 PM   #3
rymaggi
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Quote:
Originally Posted by breakablecookie View Post
Sounds to me like the wheels might just be out of balance. Maybe a weight managed to fall off while driving.

If you have the ability you should get under the car and visually inspect all 4 corners. See if maybe you have a bad CV joint/boot or maybe a worn out bushing.

Yea I'm hoping it's something simple like that.

Are there any bushings in particular I should be looking for that could be worn.

I had the shop do a run through of the suspension bits as I took her down the 1/4 track for about 15 passes, werid thing is, doing my runs the wheel never shook, but driving home it shook like crazy. Which I thought was odd.

This was before the new pump install FYI.


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Old 08-11-2014, 05:30 PM   #4
rymaggi
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At les Schwab now. Told them to check my axles, wheel bearings, ball joints.

Cars getting aligned and a road force balance along with rotating the tires.

So far the alignment is done. I told them to zero out the toe and that is all, as they don't do custom alignments out of OEM spec. Here's the sheet, waiting on a balance report.




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Old 08-11-2014, 06:05 PM   #5
rymaggi
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They said the wheel shaking was due to my tires "cupping" I've only had these wheels on the car "driving" for about 6 months or daily driving.

Is this normal for dunlop direzzi z2's to do? Before this I have never even heard of cupping.


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Old 08-11-2014, 06:37 PM   #6
rymaggi
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Default Steering wheel vibration highway

They said it was just the front two, so I had them rotate them to the back.

Hopped on the fwy took it up to 80mph. Shake seemed to have almost have vanished. Gonna head to work and take the fwy again to double check.

Just drove to work. Vibration still there. And gets more pronounced as I increase speed.

They didn't end up balancing the tires because they thought it wouldn't change the shaking.

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Last edited by rymaggi; 08-11-2014 at 07:10 PM.
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Old 08-11-2014, 11:21 PM   #7
rymaggi
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Default Steering wheel vibration highway

Shakes then goes away. Drove for 15 minutes holding 70mph. No shake. Took the on ramp a little fast accelerating to 75mph no shake. I slow down it comes back. Seems to come n go almost. If I do 60 it's constant.

I think I'm just talking to myself now lol. I know there's a ton of these threads but someone throw me a couple bones here.

I've had two shops confirm, my suspensions all rock solid.

Could there be air in the system still? Leaky steering rack? Only things I can come up with.


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Old 08-11-2014, 11:52 PM   #8
lookylookitzadam
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Rub your hand over the tire around the diameter. If it feels wavy, that is cupping. That will lead to a speed sensitive shake.

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Old 08-11-2014, 11:56 PM   #9
rymaggi
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Default Steering wheel vibration highway

Quote:
Originally Posted by lookylookitzadam View Post
Rub your hand over the tire around the diameter. If it feels wavy, that is cupping. That will lead to a speed sensitive shake.

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They said the front had cupping, the rears did not, so i had them rotate them.

If the rears are the only ones cupped now, would that still make the steering wheel shake?


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Old 08-11-2014, 11:57 PM   #10
Annihilator817
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Are the spacers hubcentric?
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Old 08-12-2014, 12:01 AM   #11
rymaggi
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Originally Posted by Annihilator817 View Post
Are the spacers hubcentric?

Yes. And I have hub centric rings in my enkei's.


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Old 08-12-2014, 12:12 AM   #12
rymaggi
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This also was not happening prior to the motor build. I had the same suspension and wheels before and after. It start occurring after the build.


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Old 08-12-2014, 12:12 AM   #13
Annihilator817
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Check the wheel bearings, and as scary as this is, also check to make sure all the bolts that hold the hub to the knuckle are present. Fuji Heavy Industries forgot two out of the four bolts on the drivers side front hub on mine when they built it.

Caused a slight chatter from day one, and after many thousands of miles, turned into a nasty vibration.

Im probably just lucky to be alive.

edit: nevermind, your hubs are press in. Still look at the bearings.
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Old 08-12-2014, 12:18 AM   #14
rymaggi
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Default Steering wheel vibration highway

Quote:
Originally Posted by Annihilator817 View Post
Check the wheel bearings, and as scary as this is, also check to make sure all the bolts that hold the hub to the knuckle are present. Fuji Heavy Industries forgot two out of the four bolts on the drivers side front hub on mine when they built it.

Caused a slight chatter from day one, and after many thousands of miles, turned into a nasty vibration.

Im probably just lucky to be alive.

edit: nevermind, your hubs are press in. Still look at the bearings.

I have to do an oil change soon so I'll check some bolts. I mean I had two shop give it a shake down, literally. Said everything's good.

Can wheel bearings be bad, even if they don't move when you try n shake the wheel at 12 o clock and 6.

I don't have center caps in my wheels so the nut is exposed. Is there anything visually I should look for. The only way I know to check wheel bearings is trying to shake the wheel itself.

The hubs are from the v7 drivetrain I purchased off here. So no telling the last time they where changed. Or even how old they are.

Also when cursing to a left hand turn lane and there is a curb to reflect sound I can here a vv.. vv.. vv.. So I'm guessing my brakes are getting low, but I don't see how that would cause a high speed steering wobble and not wobble everytime I hit the brakes.

If I can't figure this out myself, I might just take it to a subaru dealership, never done that, I know they rape you on cost and labor though.

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Old 08-12-2014, 12:23 AM   #15
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I would say that if you cant feel play while shaking the wheel, its unlikely the hub is causing such a large vibration.

Als an axle nut not torqued right could cause it too. Both me and a friend have had that issue on our cars in tge last two years.
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Old 08-12-2014, 12:27 AM   #16
rymaggi
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Default Steering wheel vibration highway

Quote:
Originally Posted by Annihilator817 View Post
I would say that if you cant feel play while shaking the wheel, its unlikely the hub is causing such a large vibration.

Als an axle nut not torqued right could cause it too. Both me and a friend have had that issue on our cars in tge last two years.

What do u mean exactly not torqued "right" like too lose? Where are those and how do I check em.

I just don't get how it can be intermittent with different speeds.

When I was doing 1/4 runs (before the new pump, and on the fwy, the shake was out of control scary, now it's mild and annoying) and reached 120mph at the end. There was zero shake through the run/pull.


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Old 08-12-2014, 12:30 AM   #17
rymaggi
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Just found a picture of an axle nut, that is what's exposed with my wheels. Should I un bend that little metal flap and check the torque specs.


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Old 08-12-2014, 12:33 AM   #18
Annihilator817
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Yes, loose.

its a large 32mm nut on the end of each axle. You said you have no center caps on your wheels, so you should be able to see them. The edge of each nut should be bent down like someone used a punch to lock it in place. If the bend on the nut isnt aligned with the divet in the axle, you will know for sure it moved.

Its not a horrible idea to replace those every once in a while anyway, and they're only a couple buck a piece.
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Old 08-12-2014, 12:36 AM   #19
Annihilator817
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The axle nut is really a one time use item. So if you do unbend the pinched part of the nut, you really should replace the nut.

Its also a goodidea to torque them with the car off the ground, but that will also require someone standing on the brakes while you torque it.
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Old 08-12-2014, 12:37 AM   #20
rymaggi
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Default Steering wheel vibration highway

Quote:
Originally Posted by Annihilator817 View Post
Yes, loose.

its a large 32mm nut on the end of each axle. You said you have no center caps on your wheels, so you should be able to see them. The edge of each nut should be bent down like someone used a punch to lock it in place. If the bend on the nut isnt aligned with the divet in the axle, you will know for sure it moved.

Its not a horrible idea to replace those every once in a while anyway, and they're only a couple buck a piece.

For sure I'll give that a shot. Thanks for your replies. It's nice to be able to get ideas and check things off from being the possibility.

Gotchya. I'll order two new ones for the heck of it.


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Old 08-12-2014, 12:47 AM   #21
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No problem, happy to help.

hate when I cant track down a noise. Very frustrating. Its compounded when the noise is unnerving and seemingly a potential safety issue, like in your situation, so I can empathize with where you are right now.
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Old 08-12-2014, 12:54 AM   #22
rymaggi
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Quote:
Originally Posted by Annihilator817 View Post
No problem, happy to help.

hate when I cant track down a noise. Very frustrating. Its compounded when the noise is unnerving and seemingly a potential safety issue, like in your situation, so I can empathize with where you are right now.

Yea before I got the new pump, it was so bad I was seriously afraid to take it on the fwy. It would shake that bad. It was super violent. Like as bad as the shake u get when bleeding the power steering system with tons of air.

It's kinda werid how the OEM pump helped the shake, but didn't cure it. I was sure the old pump was the culprit.


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Old 08-12-2014, 01:05 AM   #23
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I think maybe it sitting for months during the build may have deformed your tires
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Old 08-12-2014, 01:07 AM   #24
rymaggi
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Quote:
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I think maybe it sitting for months during the build may have deformed your tires

The car was sitting in the sun for 4-6 months on the driveway.


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Old 08-12-2014, 10:48 AM   #25
rymaggi
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Also noticed that if it's shaking and I have to turn the wheel, say for a sweeping on ramp or around a bend, the shake stops, then comes back when I center the steering wheel.


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