Anti-Roll Bars for the S4

[rsdreamer]

Hi all.

Go for 32 / 21's with some adjustable links for the rears.

My oem links broke on my first trackday, but the replacement adjustables are doing very well indeed.

Don't forget, arb's control body roll, coilovers control stiffness.

With the rear arb, the hole to the front of the car = soft setting, hole to the rear of the car = hard setting, (least body roll).

rsdreamer.

[SimonS4MTM]

I am struggling to see how an adjustable arb link will effect the arb stiffness.

Would someone kindly explain please?

[MarkB]

Moving forward or backwards would efect the turning moments against the bar so adjusting the amount of twist put on the bar. I can't imagine it would make a massive difference though

[s4woody]

Smoothes out suspension to help balance out cornering,and i believe it releases all the preload tension of the arb,s..plus they dnt flex..

[SimonS4MTM]

Moving forward or backwards would efect the turning moments against the bar so adjusting the amount of twist put on the bar. I can't imagine it would make a massive difference though

That is the holes on the ARB, yes I can see how that effects the stiffness.

[SimonS4MTM]

Smoothes out suspension to help balance out cornering,and i believe it releases all the preload tension of the arb,s..plus they dnt flex..

Surely that will put a pre-load on the arb, leaning the car one way will increase the twist on the arb, but leaning the car the other way will release the pre-load to eventually reaching a point of equilibrium before twisting the shaft in the other direction. Surely that cannot be good for handling?

[MarkB]

Ah yes sorry. I re-read your post... But as Simon says they can remove pre load, but also if they are made longer or shorter depending on the angle this then puts it in relation to the bar and the angle the bar is then at you are changing the force against the bar

[MarkB]

Smoothes out suspension to help balance out cornering,and i believe it releases all the preload tension of the arb,s..plus they dnt flex..

Surely that will put a pre-load on the arb, leaning the car one way will increase the twist on the arb, but leaning the car the other way will release the pre-load to eventually reaching a point of equilibrium before twisting the shaft in the other direction. Surely that cannot be good for handling?

You want no twist on the bar when the car is flat and level. Unless you are Oval Racing!

[SimonS4MTM]

You want no twist on the bar when the car is flat and level. Unless you are Oval Racing!

But if you change the length of one of your arb links, this will put twist on the bar.

[MarkB]

You would want the change the length of both and keep the pre load off the bar

[SimonS4MTM]

You would want the change the length of both and keep the pre load off the bar

If you change the length of both, then how is that changing the pre-load on the bar?

Sorry for all the questions!

[s4woody]

i think if the links are made longer that will alter the angle of the arb which will change the reaction time surely..or even the leverage effect..you dnt see many racing cars with plastic suspension parts and i,m sure that even if we dnt quite grasp the reasons behind it they work better than oem..

[SimonS4MTM]

i think if the links are made longer that will alter the angle of the arb which will change the reaction time surely..or even the leverage effect..you dnt see many racing cars with plastic suspension parts and i,m sure that even if we dnt quite grasp the reasons behind it they work better than oem..

Yes, I can see the benefit of fitting stiffer links, just cant see the point in making the length adjustable.

[s4woody]

well the way i design them is so that u can adjust the taper high enuf to miss the driveshaft when changing to the hardest setting..well that was the idea anyway..

[MarkB]

It all down to the length and the leverage. Hard to explain in words, maybe someone could do a drawing.