How to decrease understeer?

[CupraWay]

I like to decrease the understeer of my mk3 cupra. The car is already lowered which made a big difference. I'm now thinking of buying a Neuspeed ARB. What is the best combination? Only 25 mm rear or only 28 mm rear or 25 mm front and 25 mm rear or 25 mm front and 28 mm rear?

What is the effect on yhe handling of the car with these combinations?

 

[Rick-24]

Well, puting a arb.... will reduce body roll and give less grip in theory, but it depends on the whole setup, if u got adjustable/damping coilovers on u could make the front abit softer damnping and may change the spring rate, and put a arb on the front to stop the body roll, should give u more front end grip, but i would just try one one the rear if u havent got adjustable damping as this will give u less grip on the rear, u might find ur camber is out from lowing it. if so u will have less grip if u got to much on or to little, have u had it set up properly?....im not no expert but i got a general idea as i used to race pro radio controled cars and the work pretty much the same

 

[CupraWay]

I got a lot of negative camber on the rear. I don't have ajustable damping.

The car is on the front a little lower than on the back and i have a strutbar on the front.

So if i understand it right putting a arb wil give you less bodyroll which is good, but wil also give you less grip which is bad.

I hate it when the car starts to glide over the frontwheels in the wet.

What would you advice in my case? Only a 28 mm arb on the rear or is a 25 mm arb enough?

 

[smiffy931]

Hi,
I know its a completely diferent car but me and my dad have raced for years and have found the best way to combat understeer is to either soften the front or stiffen the rear.

e.g. no arb on front or softer springs

or


rear arb on stiffer or stiffer rear springs

hope this helps


josh

 

[CupraWay]

Thnx.

I will try the 25 mm neuspeed arb on the back or maybe even better the 28 mm? Or is 28 mm to stiff for a ibiza?

Can someone please give some advice on this?

 

[Rick-24]

I would say ask bill @ badger 5, he will prolly know as does alot of track racing, he will prolly know wats best for the ibiza. have u tryed spacers on the rear, making the back wider will make the car turn more. as it will give atad less grip but make it more stable under braking and less twichy

 

[WeeJase]

the neuspeed rear anti roll bar has 3 settings,so you can set it up how stiff you want it,i can oly guess ,but i reckon the stiffest on the 25mm bar isn't far off the softest on the 28mm bar,i had the 25mm on my old cordoba and it helped out superbly.
i have an eibach rear only on the octavia and thats transformed the roll out of corners in particular

 

[ibizacupra]

if keeping the front std 20-23mm taper arb then to balance 25mm rear Neuspeed should help.
I would personally go 28mm rear and be done with it. but handling is personal taste as much as anything and what I like wont neccessarily be what you like.

3 position adjustable as said, and if you dont like it you can still go 25mm front Neuspeed to balance it out again

hope this helps.

what rear camber you got? why so much? Its fixed (aside from shimming stub)

 

[CupraWay]

thnx, so the 28 mm rear arb is a better solution because you can balance it out with a 25 mm front arb.

I got negative camber on the rear wheels because the car is lowered. My mechanic told me that the camber on the rear wheels is not ajustable like on the front wheels. I don't know what a shimming stub is. Is this a way to correct the camber on the rear?

edit: With negative camber i mean that the top of the tyre is more inside the arch than the bottom.

 

[ibizacupra]

unless you are silyl low you shoudl have about -1 degree camber on the rears when lowered 40-50mm... mines about those numbers.

 

[CupraWay]

I think my car is silly low

Here's a picture

 

[m0rk]

just at a quick glance your camber isn't set right on the front....

i'd get the alignment done right (after you've lifted the car a bit)

 

[CupraWay]

You're absolutely right Mork. This picture was taken right after the car was lowered. The car is now on the back about 1 cm higher and the alignment on the front is corrected.

 

[CupraWay]

This is how the car looks now

 

[ibizacupra]

what size wheels are those?

 

[ibizacupra]

 

[CupraWay]

17 inch with 205/40/17 tyres

 

[CupraWay]

Look like yours is even lower !