oversteer.

[chockz]

Hi guys,

my car oversteers under corners (esp under bumpy conditions, rear "bounces" out).

car is an EG

suspension setup :

tiens HA, front strut, rear sway (23mm), rear strut, C-pillar.


any ideas? or issit natural for the rear to bump out under road conditions.


Chock

[aaronng]

Stiff suspension, thick rear sway bar and poor bumpy roads is a nice combination to cause your rear to lose grip.

[chockz]

stiff suspension in the rear or too loose in the front?

i dunno man aaronng, need to setup or else will lose my fun at wakefield.

[d15z1SUX]

i know if u soften the rear up a bit u will get more understeer as opposed to a stiff rear.

[chockz]

or stiffen the front? hmmm..
choices..thanks man...

[vincikwan]

Stiffen the front n loosen the rear. I did that to create more understeer in my S15.

[Bludger]

if you're oversteering, then make the front significantly stiffer than the rear.

Soften the rear a lil bit.

do you suffer from lift off over steer?

[T-onedc2]

The bottom line is if it "bounces" out, the tyre's are not keeping contact with the road. First thing to to is soften the rear dampers, then then if still a problem look at a softer spring or raise the height for more travel. Sway bar should be fine.

[aaronng]

or stiffen the front? hmmm..
choices..thanks man...

I agree with T-onedc2. Soften the rear. Don't stiffen the front. That will make the front more bouncy and tend to slide first.

[simonnowis]

have you installed a front swaybar? if you dint, it will make it alot better once u install a larger front swaybar

[chockz]

alright...thanks guys...

Bludger - yeah under bumpy road conditions, the back bounces out...(like require load at the back)

T-onedc2, simonnowis - i guess u mean front sway? How thick?

aaronng - see how it goes after the front sway. May write it up. Thanks.

chock

[Bludger]

All you have to do is soften the rear.

With my cusco's, whenever i had the rear dialed in with high stiffness, it would kick out whenever i lifted off the throttle. Making it very hard to control.

Now I have the fronts a little harder than mid point and the rears a lil softer than midpoint.

Very balanced setup.

[Bludger]

hardening the front will work too, it'll make the car balanced, but your car will feel like a go cart.

slippin and sliding everywhere, but controllable.

[chockz]

getting a front sway and see how it goes....sadly my fronts are HA and the rear are some aftermarket stiff springs+ shocks from either an EG or EK ( i'm clueless).

so i can only adjust the fronts ...i guess i got para with the rear being "softer" than the front, i went 23mm rear sway, C-pillar and rear strut. now it seems the rear is too stiff ...ABUNAI!!!


chock

[T-onedc2]

T-onedc2, simonnowis - i guess u mean front sway? How thick?

chock
I meant the rear, assuming the front is 24mm or thereabouts

[JohnL]

like a go cart. slippin and sliding everywhere

Only if the tyres are old and hard and / or the set up is bad. A well set up kart has plenty of grip...

[Elwood]

Soften the rears, then if this continues, take out the rear sway? :P

Thick rear sway bars will tend to make the car oversteer.

[chockz]

JohnL - suspension guru, read ur theory on roll...nicely done...90% RE001s good enuff for the makeshift go-kart?

Elwood - I REFUSE!!! so much effort to bloody bolt on that 23mm rear sway..i had to change my bloody axle-back. Hahaha...

what's ur guys thoughts on traction bars. Heard good stuff from my mate.

chock

[chockz]

all - decide to go for the 24mm sway bar...will update on the effects.

[Bludger]

Only if the tyres are old and hard and / or the set up is bad. A well set up kart has plenty of grip...yeah I know man

couldn't think of any other example:)

A better example would be an excellent chassis with bald tires.
very responsive, well balanced but no grip. Slippin and slidin everywhere.,

[Elwood]

all - decide to go for the 24mm sway bar...will update on the effects.


Thicker rear sway bars make the car oversteer more


......

[T-onedc2]

......
He means front 24mm

[chockz]

T- onedc2 10x =)

ahhaha

ELwood - .... Gold


stay tuned.

[Elwood]

Ah, no worries then :)

[55EXX]

24mm should bring the balance towards under alot more and improve response alot too. whiteline does a 27mm bar too.

[chockz]

55EXX - let's see how it goes mate...you mean handling right? not response? ....SHOULD be doing the front sway this coming thursday. Will post up pics. Unless i sell my car by then. Decisions ...decisions.

[CB7_OWNER]

Yeh... happened to me... I got Koni yellows.. on about 1.5 turns @ the rear... and went i hit a bump or rock. the rear would "bounce out" soo i lowered the dampening to 1 turn... and its fine now.

[55EXX]

i mean the front will be more alive. more darty. more responsive. yes so i guess handle better. 24mm will be enough front roll resistance for you needs.

[chockz]

yeah
thursday morning..will be at top one doing it =)

come down if possible...chillax and chat lah.

[aaronng]

i mean the front will be more alive. more darty. more responsive. yes so i guess handle better. 24mm will be enough front roll resistance for you needs.

More darty and more responsive in addition to a very loose rear end... Not really the ideal setup for poor condition roads.

[Bludger]

More darty and more responsive in addition to a very loose rear end... Not really the ideal setup for poor condition roads.good way to improve driving skillz

not recommended though:p

[JohnL]

In theory increasing the front roll stiffness will take some of the 'looseness' out of the rear (i.e. reduce understeer), but if the rear is too stiff for road conditions (i.e. bumpier roads), then it will still be too stiff with a stiffened front end. Now both ends may be too stiff for bumpier roads...

You do need the wheels to follow the road contours, not skip from one irregularity to another. Very stiff set ups are only suited to smooth roads.

[chockz]

Alright, thanks everyone...brought the car to T1 today...

Apparently, the front sway already on the car is taken from DC2. (24mm) i think.
so, i stiffen the front and made my way home. car seems to bounce (all 4 now) under bumpy conditions. Oh well, let's see how it goes at wakefield.

thanks everyone for their input.

chock

[JohnL]

Did somebody predict that...?

I think you probably need to soften rather than stiffen the suspension...