Rear Seems To Hop On Hard Cornering

[nuffsaid]

Hi all

I have a R34 GTT with the following suspension mods:

- tein super streets

- whiteline front (24mm) and rear sway (20mm) bar both on soft

- front and rear camber kits

- front castor kit

- aligned to SKs settings, pretty much everything is SK spec except coilovers and slightly smaller rear bar

Problem I am having is that when I take say a hard left corner, the rear seems to hop hop hop as if the rear passenger wheel is coming up and off and onto the road again. Its either that or the tyres are rolling on the side so much that Im getting that feeling. it is hard to explain but its like the rear of the car is hopping along to follow the cornering line.

The front seems fine to me and is well planted.

Any ideas what it could be? or what I should try to get rid of it? is it too much body roll?

Thanks

[Cain]

what tyres?

[nuffsaid]

Falken FK451's. Towards the end quarter of their life.

[evil_weevil]

You havent mentioned the sub frame align kit - have you got that?

Also, what diff do you have?

[nuffsaid]

Whoops no sub frame alignment

Stock diff

[Duncan]

springs too hard so it skips over bumps on the road?

[Sandeep]

maybe try softening up the damping on the rear and see if that helps.

[nuffsaid]

Nah its not skipping over bumps as that one particular corner i go over every morning is smooth as.

Tried going full soft on rear, to mediumhard, almost no difference.

[Beer Baron]

does the car actually kind of buck? called pig rooting? happens in slower, tighter corners. and it happens when you are getting on the power just before the apex?

[nuffsaid]

does the car actually kind of buck? called pig rooting? happens in slower, tighter corners. and it happens when you are getting on the power just before the apex?

Dont quite get what you mean by bucking BB? But im def. not getting on the power early

[Beer Baron]

like as in the car is behaving as though it was a mechanical bull. ie jerking up and down as you are cornering?

[_Ryan_]

like as in the car is behaving as though it was a mechanical bull. ie jerking up and down as you are cornering?

What causes pig-rooting?

-Ryan

[MrStabby]

like as in the car is behaving as though it was a mechanical bull. ie jerking up and down as you are cornering?

I get that, but only on the street. I know my rear springs are too hard, but is there another reason it happens?

[SeanO]

I seemed to have that problem at one stage my cars left hand rear shock had gone simple bounce test later and a replacement found and its been all good so far

it bounced around on tight corners but also on long sweeping corners at speed however it may have no relevance as i have a 33 but still thats my 2 cents hope it helps

Edited November 18, 2007 by SeanO

[_Ryan_]

both my cars do it with new shocks... might be my driving

[Granthem]

mine does this on real tight corners on the street

cusco coil overs.

maybe that 50% more rigidty was too much

never

[Abo Bob]

Were the Teins new?

You keep having weird problems with this car eh.

Are you slowing or accelerating through 80km/h during this corner?

Have you got a new bike yet?

[nuffsaid]

Were the Teins new?

You keep having weird problems with this car eh.

Are you slowing or accelerating through 80km/h during this corner?

Have you got a new bike yet?

Hahaha i dont really have any problems at all, i always think i do but its always fine in the end, i think its just my fussy self hahah

i think ive been pretty lucky to have everything go well with the car so far (knocks on wood)

teins are new, 1 year old, only done maybe 10 thousand km on them

its like a tight bend, im only doing maybe 50km/hr, maybe its just the nature of the bend, its one of those ones that get tighter as you get into it

naah still trying to sell the white cibby first, then onto a 600cc hopefully

[stasis]

i have exactly the same problem too. Theres a nasty winding road when i got to Bendigo its like a U turn on the middle of the hill and each time i turn it seems the tyres are slipping at the rears. Sort of felt like going into a dip and the car bounce back. I installed the tein read my signiture for specs.

[Sydneykid]

Sounds like, insufficient rebound damping in the shocks to control the spring wind up caused by the rear squat on acceleration. Typical of a poorly matched spring rate and shock valving.

If you have adjustable shocks, try winding them up towards full stiffness. It sometimes helps.

Cheers