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-   -   An alternative anti roll bar setup (http://forums.pelicanparts.com/porsche-911-technical-forum/412593-alternative-anti-roll-bar-setup.html)

Peter Bull 06-02-2008 10:26 AM

An alternative anti roll bar setup
 
A year or so ago I got a set of custom valved Leda coilovers. The springs that came with the coilovers were somewhat stiffer than what is achievable with t-bars, so I knew I had to get new anti roll bars as well. Although there are many good ARB-sets available, all of them use the through the front tub/wheel well design, which I don't feel comfortable with. Therefore I designed a setup myself. The parts were available as a kit from Sellholm Tuning in Sweden. So all I had to do was weld up the tubes, make some brackets and fit it into the car. Well, it wasn't exactly that easy, and it took a while to complete, but here's the result.

Front setup, as seen from the front
http://forums.pelicanparts.com/uploa...1212430919.jpg

Front setup, as seen from the rear
http://forums.pelicanparts.com/uploa...1212430954.jpg

Rear setup
http://forums.pelicanparts.com/uploa...1212430992.jpg

The rear brackets are a little too close to the ground, and I'm not entirely happy with the bearing solution. But hopefully that will be ironed out after a little running in period.

/Peter

aftermath 06-02-2008 10:33 AM

why cant you use existing roll bars, like adjustable ones from elephant racing if your using stiffer coil overs? I plan to buy a coil over kit and new suspension down the road.

Flieger 06-02-2008 10:42 AM

Why do you need stiffer bars at all if you have stiffer springs? The stiffer springs will reduce roll by themselves.

Peter Bull 06-02-2008 11:01 AM

Quote:

Originally Posted by aftermath (Post 3978865)
why cant you use existing roll bars, like adjustable ones from elephant racing if your using stiffer coil overs? I plan to buy a coil over kit and new suspension down the road.

You can, but as I said I don't like the through the tub/wheel well setup where the front ARB is mounted in the sheet metal in the wheel well.

Quote:

Originally Posted by Flieger (Post 3978880)
Why do you need stiffer bars at all if you have stiffer springs? The stiffer springs will reduce roll by themselves.

If you want the possibility to adjust the behavior of the car with the ARBs, they have to contribute noticeably to the roll stiffness of the car. Therefore; if you use stiff springs you need stiff ARBs.

/Peter

84_Carrera 06-02-2008 12:05 PM

Yep, that design is similar to typical modern car swaybar endlinks. Attach at the strut & end of sway. I bet over time you'll really hear the Heim'd links vs. something that's a sealed unit.

Looks nice for the work though.

lateapex911 06-02-2008 12:18 PM

That is certainly a very sophisticated setup.

I like how the front bar actually will produce a variable rate depending on steering angle. Less effect at lower speeds. Not often seen, very slick.
And the use of blade arms means the stiffness adjustments won't affect the geometry. Very nice.

where did you source your components?

Peter Bull 06-02-2008 01:34 PM

Quote:

Originally Posted by 84_Carrera (Post 3979050)
Yep, that design is similar to typical modern car swaybar endlinks. Attach at the strut & end of sway. I bet over time you'll really hear the Heim'd links vs. something that's a sealed unit.

Looks nice for the work though.

Thanks. There are some rubber shims available to seal the rod ends that I'll fit once I find a place to buy them. Hopefully that will extend the service life a little, but I reckon I have to change the rod ends every now and then.

Quote:

Originally Posted by lateapex911 (Post 3979074)
That is certainly a very sophisticated setup.

I like how the front bar actually will produce a variable rate depending on steering angle. Less effect at lower speeds. Not often seen, very slick.
And the use of blade arms means the stiffness adjustments won't affect the geometry. Very nice.

where did you source your components?

Thanks, I sourced most of the parts from a company in Sweden called Sellholm Tuning. The brackets on the front coilover struts I had machined from aluminum, the front mounts were made from some flat bar, and the rear mounts were welded from some steel U profile.

/Peter

911pcars 06-02-2008 01:36 PM

I don't see the cable connection to rotate the bladed arm.

Sherwood

Peter Bull 06-02-2008 01:42 PM

Quote:

Originally Posted by 911pcars (Post 3979223)
I don't see the cable connection to rotate the bladed arm.

Sherwood

I'm afraid I don't have one. I don't feel the need for that. Yet.

/Peter

euro911sc 06-02-2008 05:30 PM

Blade arms also mean infinite adjust ability instead of the 5-6 holes usually found... Nice work. I'm sure it is prohibitively expensive to ship to the US, but I'll check out the web site :)

-michael

euro911sc 06-02-2008 05:31 PM

hehehe always a fun problem when the web site is in a different language with lots of funny marks all over the letters ;)

-m

Peter Bull 06-03-2008 08:38 AM

Quote:

Originally Posted by euro911sc (Post 3979672)
Blade arms also mean infinite adjust ability instead of the 5-6 holes usually found... Nice work. I'm sure it is prohibitively expensive to ship to the US, but I'll check out the web site :)

-michael

They are a little tricky to adjust. When the blades are on edge; turning them just a small angle results in a relatively large change in stiffness, and when they lay flat it is the opposite.

Quote:

Originally Posted by euro911sc (Post 3979675)
hehehe always a fun problem when the web site is in a different language with lots of funny marks all over the letters ;)

-m

Funny marks? I don't see any funny marks :p

/Peter


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