Changing sway bar diameter

[Thorsten S.]

What do you think how the handling of a car will change, when I increase the daimeter of the sway bars by 2mm front and rear? For example on a 3,2 Carrera front from 22mm to 24 mm and rear with 21mm to 23 mm.

Grüße

Thorsten

[jpachard]

This will flatten the car out, thus assisting in retaining camber in the corners. It will also make the car less forgiving over bumps etc. Will you be driving this car on the track? If so, I would strongly suggest adjustable sway bars since these allow you to fine tune your car's handling. Sway bars should be the last thing on the menu when it comes to suspension upgrades. One should address the springs and dampers first.

Cheers, James

[Bill Verburg]

I agree, adjustable is the way to go, there is a wide range of price and quality to choose from.

[Thorsten S.]

I drive this car on street and track, but only with street tires (Bridgestone S02 N3). But when I want to drive it on the street I can not go to adjustable because of the TÜV . Thats why I ask this question.
Will I need a limited slip differential an which strength? Is the factory 40% o.k. for street and track?

Grüße

Thorsten

[Bill Verburg]

But when I want to drive it on the street I can not go to adjustable because of the TÜV .

Bummer

Yes bigger bars will keep the car flatter and also hurt on differential bumps(one wheel is deflected the other is not).

Yes, I like the factory ZF ratios for dual purpose use. The only thing better would be the differential locking factors as used on the Cupcars, to the best of my knowledge this isn't available for 915s yet.

[Thorsten S.]

Bill,

you think about the asymetric differential of the 964 RS with 20% factor with gas and 100% of the gas?
I have got a Carrera 3,2 with G50. Will the RS differential fit ?

Grüße

Thorsten

[jpachard]

The better option would be a 60/40%lockup. The 100% is a bit too aggressive for your car. I have the 60/40 Guard ZF unit in my car and it works great. This is what he recommends for these cars. Mine is a custom one built by Paul Guard.

Cheers, James

[Bill Verburg]

Will the RS differential fit ?

Yes, there are many choices here 20/100 is a bit extreme, 45/65, 40/80 something like that would likely work better.

[Dutchie]

Thorsten can you get the car through TUV without swaybars ? if so the Tarret bars are very easy to take off when you got to TUV, just takes 10 minutes.

[Thorsten S.]

Dutchie: I do not think so. But the biggest problem is, when it comes to an accident with an "illegal" or not TÜV approved car. The insurance would not pay one cent.

Grüße

TS

[Wil Ferch]

TUV is not like "inspection" in the States.....you can't mess around with stuff like this in Germany.....

---Wil

[gumba]

I wouldn't think a 2mm increase in sway bars would make a noticable difference. If you can't go to adjustable bars another alternative might be stiffer or revalved shocks. For a street/track car I would stay with a 40% lsd. I have an 80% factory lsd & 80% Guard in our track cars. Great for the track, lousy for autocrossing. On the street I feel the front end being pushed through the corners.
You might look at the Smart Racing site and see rate difference in the sway bars.

[Thorsten S.]

I have E-mailed to RUF for a LSD and what they recommend and wait for answer.
Smartracing parts I can not drive on street (no TÜV)!!!

Grüße

Thorsten

[gumba]

The Smart Racing reference was for you to see the different roll rates between different size sway bars. You could use this to decide whether going up 2 mm in bars would have an effect.