Shake that ass. Jiggly rear end. Alignment setup?

Post by **RattyMcClelland** » Wed Nov 11, 2015 8:38 pm

I have been driving the car in the dry since Polybushing and rear roll bar upgrade.

Now i can tell a difference. The ride is a little more harsh as in feeling bumps and rebounds etc.

However the most noticeable difference and actually very annoying is the rear end is jiggling around from left to right in a straight line. Its shaking its ass. This does it on bumpy pot holes and bumpy uneven roads.
This does not effect the steering and the car remains straight however the rear end jiggles and this make me jiggle in my seat.
The stiffer rear roll bar is obviously doing this.

However in all internet reviews of stiffer rear roll bars this is NEVER mentioned. Kind of a big deal IMO.

Could a better alignment setup help? As is more toe out front and perhaps a bit of toe out in the rear. Tyre wear can suck balls.

I have softened the dampers up alot to around 10 front and 6 rear out of 32 on the stiffness. This helped.

I currently dont have my front strut brace installed?

Stiffer front roll bar? More understeer though.

The car turns very nicely now though. Handling is amazing. The rear loves to turn.

Post by **Merlin** » Wed Nov 11, 2015 8:59 pm

RattyMcClelland wrote:Could a better alignment setup help?

Did you get a wheel alignment after fitting the polybushes or the toe arms? If not I would go and get one done.

mercutio · Post by **mercutio** » Wed Nov 11, 2015 9:21 pm

the rear bar are the roll bar bushes poly? if so that will cause some of it, Also only having an upgraded rear bar will leave the car a little unbalanced. I had the same issues on my old 4g when i had just the rear bar on yes it was happy to dive into corners but all the action was taking place at the back.

i have an uprated rear bar for my 5g but i am not going to fit it until i have a front one for just that reason it makes the back end really lively and a little bouncy, if it finds a rhythm it will get worse if you know what i mean.

Post by **RattyMcClelland** » Wed Nov 11, 2015 9:52 pm

Merlin wrote: Did you get a wheel alignment after fitting the polybushes or the toe arms? If not I would go and get one done.

Yes results are in my profile thread.

mercutio wrote:the rear bar are the roll bar bushes poly?
i have an uprated rear bar for my 5g but i am not going to fit it until i have a front one for just that reason it makes the back end really lively and a little bouncy, if it finds a rhythm it will get worse if you know what i mean.

Every Bush is poly. Front and rear roll bars. Yet maybe it's out of balance.

mercutio · Post by **mercutio** » Wed Nov 11, 2015 10:18 pm

rubber roll bar bushes might soften the action of the stiffer bar

Post by **Merlin** » Thu Nov 12, 2015 9:02 am

You could get them to take the rear toe out. On my road car I have rear toe at zero.

Nice equal camber all round

Post by **Drax** » Thu Nov 12, 2015 9:14 am

mercutio wrote:the rear bar are the roll bar bushes poly? if so that will cause some of it, Also only having an upgraded rear bar will leave the car a little unbalanced. I had the same issues on my old 4g when i had just the rear bar on yes it was happy to dive into corners but all the action was taking place at the back.
i have an uprated rear bar for my 5g but i am not going to fit it until i have a front one for just that reason it makes the back end really lively and a little bouncy, if it finds a rhythm it will get worse if you know what i mean.

my uprated rear ARB is the only thing polybushed on my 4g and I didn't get any "rear wiggle". could be a 2ws vs 4ws thing though due to the extra camber (I think) the 4ws can be set to maybe?

Post by **RattyMcClelland** » Thu Nov 12, 2015 12:45 pm

I told them to put rear toe at zero but he didnt. But I'll go else where next time. Might do a tad toe out on the front.

Post by **Merlin** » Thu Nov 12, 2015 2:25 pm

I'd keep it at zero on the front and maintain front end grip.

mercutio · Post by **mercutio** » Thu Nov 12, 2015 5:31 pm

Drax wrote:
mercutio wrote:the rear bar are the roll bar bushes poly? if so that will cause some of it, Also only having an upgraded rear bar will leave the car a little unbalanced. I had the same issues on my old 4g when i had just the rear bar on yes it was happy to dive into corners but all the action was taking place at the back.
i have an uprated rear bar for my 5g but i am not going to fit it until i have a front one for just that reason it makes the back end really lively and a little bouncy, if it finds a rhythm it will get worse if you know what i mean.
my uprated rear ARB is the only thing polybushed on my 4g and I didn't get any "rear wiggle". could be a 2ws vs 4ws thing though due to the extra camber (I think) the 4ws can be set to maybe?

Ratty doesnt have 4ws i didnt have it with my old 4g either but still got the bouncing wiggly feeling (that sounds so wrong)