Jump to content
SAU Community

Recommended Posts

Hey Guys,

I went drifting on the weekend at wakefield. My car now is 'wobley' in the rear end.

I don't notice it on smooth road. I only notice it when I hit a bump like where they have re-tarred a section, so it's a bit higher.

The car seems to woble/bounce at the rear.

Can you throw some ideas my way as to what I should be looking for.

Things I have thought of;

Diff cradle loose - Checked it

Bushes - I looked, but I have no idea how to tell if they are dead? Advice please?

Loose suspension componants - I checked underneath the car, I will check the top of the suspension tonight

- HICAS - I still have it...the light isnt on, but perhaps it has something to do with it?

- Perhaps the shock is stuffed? And it's just bouncing around from a hit in the road - ie no damper??

Maybe I can get a free suspension check or something?

Cheers

Chris

Link to comment
https://www.sau.com.au/forums/topic/84330-wobley-rear-end-whats-loose/
Share on other sites

If the rear shock is kaput, you should be able to easily bounce the rear end of the car. And it will just keep on bouncing. That's the only thing that springs to mind to cause the wobble if you've checked everything else.

Can you get someone to drive behind you and watch what the rear end does?

Mine started playing up and it would just turn the rear wheels at random times. It's a bit funny having to correct the steering when you are driving at 110 in a straight line on the freeway.

I found that the subframe will still move around a fair bit with the stock bushes when you load up the suspension. Even with the hicas locked i found that my car would passive rear steer on hard cornering. I just put in some solid alloy cradles and it worked a treat.

Also get the rear wheel alignment checked out as the alignment may have been knocked about. A bit of toe out on the rear wheels makes for a very twitchy rear end, particularly on rough surfaces and when accelerating.

sounds similar to what my car was doing ages ago, i slid the rear end into the gutter at a fair speed and bent in the rear wheel, as in the bottom of the wheel went in more towards the centre of the car then the top, and this caused it to wobble when i hit bumps, i would say that maybe u have damaged ur control arm.

i would say that maybe u have damaged ur control arm.

Quite possible aswell, Although I couldn't see any damage. I will try to get time to get it to a suspension shop. But I can't see it happening for atleast 3 weeks :(

So any more ideas I can do at home is appreciated

When I had the same problem after a drifto hit (not too hard just a little gutter slap) Bent Tyre arm, would make the ass of the car slide out a bit, got it fixed think it was one part and 80 labour @ ozzy tyres.

Good luck

PS. After reading that youve looked at everything else I'm sure you would notice a bent tyre arm, in the case got me stumped too, have you gone to a specialist?

Mine does this, but much worse. It also steers the car under hard acceleration, mainly in second gear +. Second gear is a little freaky sometimes, feels very drifty. Tramlines easy etc.

My subframe bushes are nacked and were leaking.. Stopped leaking now. lol

On the dyno it looked as if the rear wheel was going to touch the front of the guard. argg. it also had heaps of toe in as it did so.

Unless you have hit something it won't be your control arm.

Noltec make replacement bushes for the arse ends of these. They are $190 for the set. Or you could simply throw in the solid alloy's. I personally don't like the vibrations and harshness they cause.

Some notice the harshness others don't.

I'm a finiky bugger, any rattle, squeek or grind drives me insane to the point where i'm bashing things to try and get it to stop while I drive. :)

Edited by Cubes

I have the same problem aswell. and it is my subframe bushes.

and i agree if you drive the car on the road and have coilovers that are a hard ride dont get pineapples. i had thm on my other car and it rattled like buggary... I ended up putting the stockers back in.

pineapples are only good for drift.

Yeah, well I am gonna get the car up on stands tonight or tommorow. I don't get home from work in time to get it to a shop, and I can't take it to work to do on lunch break.

And my saturdays are booked unti October. So I guess I gotta find it myself.

I did a motorkhana on the weekend, and it has gotten worse (not suprising huh?!)

So yeah, lucky it's not my daily driver.

I am gonna search, but if anyone has links to pulling out suspension/control arms etc, or even what parts are what, I'd appreciate it. I know nothing about the suspension componants...but I will by next week it seems!

Cheers

Chris

I've been looking in to it.

Drop the subframe. Grab a hole saw, remove the old bushes, smack the new ones in. Drop in a couple of pinapples in to angle the subframe down to help with traction. Bolt it all up.

While your there check the diff mount bushes. Likely to be buggered also. ;)

Edited by Cubes
Ok, I can move the shaft that runs from the Diff to the wheel. I can move it in/out of the wheel/diff about 3mm The left hand side is solid as. Would this be the problem? Any ideas how to fix it?

Maybe I am completely wrong, but that seems to be your problem right there. If you've been drifting, it seems that your diff is shagged, causing one of the axels to slide in and out of the centre. You shouldn't be able to move the half shafts in or out I don't think...

Yes, but that wouldn't cause other bits of the rear end to move around. If anything, I'd be looking at the other end of the shaft, at the wheel bearing maybe collapsing. However I'd expect that to cause a permanent instability in the rear end as the loose bearing allows the wheel to wobble around. That would also show itself in that the first application of brakes might be a bit hairy because the wobbling wheel has caused the disk to push the pads back on the pistons.
Its also possible your hicas rack ends are stuffed, causing random toe in and out at speed. What condition are they in?

That makes a bit more sense, but I would still expect a permanent state if instability rather than the occasional instances eXc seems to be experiencing.

Checking for worn / broken bits in the rear assembly requires a bit more than 1 man-power. When the car is moving, there are several hundred kgs exerting forces on the components, a lot more than a 100kg (for example) human can possibly exert. This is where crowbars and hoists come in handy.

I would recommend the only driving of the car is to the suspension shop for a full physical.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Here is the mess that I made. That filler there was successful in filling dents in that area. But in the middle area. I can feel dents. And I've gone ocer it multiple times with filler. And the filler is no longer there because i accidently sanded it away. I've chased my tail on this job but this is something else lol. So I'm gonna attempt filler one more time and if it doesn't work I'll just high fill primer the door and see where the issues are because guidecoat is of no use atm.
    • Ok, so I think I sort of figured out where I went wrong. So I definitely overthinked it, and I over sanded, which is probably a large part of the problem. to fix it, I ended up tapping some spots that were likely to be high, made them low, filled them in, and I tackled small sections at a time, and it feels a lot better.    I think what confused me as well is you have the bare metal, and some spots darker and some are lighter, and when I run my finger across it, it' would feel like it's a low spot, but I think it's just a transition in different texture from metal to body filler.    When your finger's sliding on the body filler, and crosses over to the bare metal, going back and forth, it feels like it's a low spot. So I kept putting filler there and sanding, but I think it was just a transition in texture, nothing to do with the low or high spot. But the panel's feels a lot better, and I'm just going to end up priming it, and then I'll block it after with guide coat.   Ended up wasting just about all of my filler on this damn door lol  
    • -10 is plenty for running to an oil cooler. When you look at oil feeds, like power steering feeds, they're much smaller, and then just a larger hose size to move volume in less pressure. No need for -12. Even on the race cars, like Duncans, and endurance cars, most of them are all running -10 and everything works perfectly fine, temps are under control, and there's no restrictions.
    • Update: O2 sensor in my downpipe turned out to be faulty when I plugged in to the Haltech software. Was getting a "open circuit" warning. Tons of carbon buildup on it, probably from when I was running rich for a while before getting it corrected. Replaced with new unit and test drove again. The shuffle still happens, albeit far less now. I am not able to replicate it as reliably and it no longer happens at the same RPM levels as before. The only time I was able to hear it was in 5th going uphill and another time in 5th where there was no noticeable incline but applying more throttle first sped it up and then cleared it. Then once in 4th when I slightly lifted the throttle going over a bump but cleared right after. My understanding is that with the O2 sensor out, the ECU relies entirely on the MAP tune and isn't able to make its small adjustments based on the sensors reading. All in all, a big improvement, though not the silver bullet. Will try validating the actuators are set up correctly, and potentially setting up shop time to tune the boost controller on closed loop rather than the open loop it is set to now. Think if it's set up on closed loop to take the O2 reading, that should deal with these last bits. Will try to update again as I go. 
    • More so GReddy oil relocation kits, sandwich plates, etc. all use 10AN fittings. And same, I've only used 10AN and my car sees track work (circuit, doing laps, not 10 sec squirt business).
×
×
  • Create New...