Konstantin

hello
I want to install some bigger sway bars in my car.
I thought to install a 20 mm rear and 26,8 mm front
My wheels are 8,5 x18 235/40-18 and 265/35-18

my car untersteers on the track so i want to avoid to go with bigger sway bars front.

I have the Koni m030 suspension with Turbo cup progresive springs front

anybody has a recomendation what sway bar to use?

My car has the stock 86 951 sway bars at the momment.

Konstantin

special tool

I have mo30 - koni 2 way adj & progressive spring height adj with 28 +/- cup bar front. Koni & helper spring with the 3 hole 968 bar rear. Center hole in rear and the tendency is oversteer.

Russ Murphy

Konstantin,
If you've got 8.5"s on the front why don't you go to say a 245 and correct the understeer with fatter rubber?

Russ Murphy

A 3cm differential between front and rear tires seems kind of large knowing how these cars handle when driven hard. I'd suggest 245 minimun with the 265 rear. The 3 postion M030 bar for the rear is pretty useful as a suspension tuning device.

Konstantin

the problem is that my rear is now (as it is ) quite stiff. If I go with
bigger torsion bars (I already have them in my garage but never instaled)
the car will has a more stiffer rear and this is not what i want. I can
adjust the rear shoks even stiffer if I want but how would this make teh
front stickier?

from what i heard till now I have many different options.
1) throw away teh progresive spring front as tehy are not good and do not
work.
2) go to bigger 245 tires front.
3) change the torsion bars
4) change only the sway bars front
5) change the sway bars on the rear only
6) change both sway bars
7) let everything as it is and just play with the tire pressure first ( I
think this make a lot of sense)

so what to do and where to start first?


Konstantin

adrial

I would give the 968 m030 rear sway bar a shot.

It's around $130 I think. It's 19mm 3 way adjustable...should do the trick. If that gives you too much oversteer (even on the softest setting), go for the front bar as well, 30mm non adjustable.

I think the rear sway is the most cost effective solution, but 245's up front makes sense as well.

jason952

there was a 20mm rear bar, may be too stiff for you, esp with that 26.8 up front. the whole 968 m030 package front and rear would be my suggestion, you can adjust the tendencies and it is nice and flat up front.

Konstantin

I ordered the 19 mm adj M030 one.
let see how it performs

Konstantin

Konstantin

and the solution is.... I lowered teh pressuer 0.2 bar in the front and teh car drives perfectly. I could turn laps and teh car hanles very good. I also made some videos where teh car oversteers very light when I push it. Otherwise it handles very neutral

Konstantin

special tool

UUUUUUUUUh - Konstantin, tire pressures, I believe, run contrary to other parts of the suspension. That is, to promote front adhesion you raise front tire pressure, and to promote rear adhesion, you raise rear tire pressure.

Danno

Hmmm, Konstantin may have had his front tires overinflated...

Most tires have an optimal operating range, say... 35-40psi hot, with the most grip at the high-end of the range. So to minimize understeer, you would set your tires to something like 40psi front and 35psi rear. If you were having an oversteering problem, you can maximize rear grip with 35psi front and 40psi rear.

Now this assumes that you've identified the optimum range. If your tires are outside this range, then yes, you might find that the opposite reaction occurs.