Modifying stock rear sway bars

Springs and shocks. What keeps your car tight around corners?
User avatar
ten2doyle102
I <3 E30's
Posts: 5462
Joined: Fri Feb 27, 2009 5:17 pm
Location: Appleton, WI
Contact:

Modifying stock rear sway bars

Postby ten2doyle102 » Thu Jun 13, 2013 2:54 pm

It sounds kind of ghetto to do, but if I wanted to gain a little more rear stiffness in my s4, you guys see any issue with doing this? I'd be looking at drilling 2 new mounting holes in the bar about 1" or so back. This would shorten the moment arm the car places on the bar as it rotates and effectively raises the stiffness of the bar. I would go ahead and buy bigger sways, but most decent kits are $300+ just for the rear setup.

It would be quick and simple to me.

Also, I recall a while back that there was a guy that made his own sway bars for his e30 as a class project. Anyone remember that? link?
Image
User avatar
Yoshi
Site Admin
Posts: 9081
Joined: Thu Feb 26, 2009 7:47 pm
AntiSpam: No
Location: North VA
Contact:

Re: Modifying stock rear sway bars

Postby Yoshi » Thu Jun 13, 2013 3:24 pm

Yes this will work and make the sway bar stiffer.

No, I don't think it will make the rear stiffer how you are thinking it will.
Image
Status: HG repair. 488wtq though!
User avatar
ten2doyle102
I <3 E30's
Posts: 5462
Joined: Fri Feb 27, 2009 5:17 pm
Location: Appleton, WI
Contact:

Re: Modifying stock rear sway bars

Postby ten2doyle102 » Thu Jun 13, 2013 4:03 pm

I mean the car should roll less, no?
Image
User avatar
ten2doyle102
I <3 E30's
Posts: 5462
Joined: Fri Feb 27, 2009 5:17 pm
Location: Appleton, WI
Contact:

Re: Modifying stock rear sway bars

Postby ten2doyle102 » Thu Jun 13, 2013 4:05 pm

And should help a little with my terrible under steering issue.
Image
User avatar
Yoshi
Site Admin
Posts: 9081
Joined: Thu Feb 26, 2009 7:47 pm
AntiSpam: No
Location: North VA
Contact:

Re: Modifying stock rear sway bars

Postby Yoshi » Thu Jun 13, 2013 4:14 pm

eh, the car will understeer by design. I don't think stiffening the rear sway will solve it the way you want.
Image
Status: HG repair. 488wtq though!
User avatar
M20_fever
Größter Vorsitzender
Posts: 11020
Joined: Fri Feb 27, 2009 1:28 pm
AntiSpam: No
Location: Northern IL

Re: Modifying stock rear sway bars

Postby M20_fever » Thu Jun 13, 2013 6:21 pm

interesting thought. Wouldn't you need adjustable end links to get the bar back to the right horizontal plane? Moving the holes in would pull it up at the same time.
Image
Midwestern Councel C Prepared class champion 2012
North Suburban Sports Car Club C Prepared class champion 2012
HSAX Instructor

GET YOUR E3P GEAR HERE: http://www.cafepress.com/e3pgearshop
User avatar
ten2doyle102
I <3 E30's
Posts: 5462
Joined: Fri Feb 27, 2009 5:17 pm
Location: Appleton, WI
Contact:

Re: Modifying stock rear sway bars

Postby ten2doyle102 » Thu Jun 13, 2013 6:47 pm

Yes, I would. But I can make those at my work. A simple steel tube with hiem joints would work for that. :)

Also, would the sways being off plane be an an issue?
Image
User avatar
Yoshi
Site Admin
Posts: 9081
Joined: Thu Feb 26, 2009 7:47 pm
AntiSpam: No
Location: North VA
Contact:

Re: Modifying stock rear sway bars

Postby Yoshi » Thu Jun 13, 2013 7:13 pm

odds of binding raise.
Image
Status: HG repair. 488wtq though!
User avatar
Nsquared97
I <3 E30's
Posts: 2889
Joined: Mon Jul 25, 2011 7:08 pm
AntiSpam: No
Location: Grand Rapids, MI

Re: Modifying stock rear sway bars

Postby Nsquared97 » Thu Jun 13, 2013 10:25 pm

Not being horizontal just means you won't get the full effect of the force the anti-roll bar generates, as some it it would be going at an angle. I would have to see what the sway looks like, but I am assuming you can tell if the bar is strong enough to drill through and use that way.

It may not solve it. completely, but a bigger rear bar definitely should help.
Image
pr0craztinazn
I <3 E30's
Posts: 490
Joined: Sun Aug 16, 2009 2:01 am
AntiSpam: No
Location: MD
Contact:

Re: Modifying stock rear sway bars

Postby pr0craztinazn » Fri Jun 14, 2013 11:56 am

The bar might stress fracture where you added new holes. VAG engineering is so stupendously terrible that I don't trust this to work, even though the idea is sound.
User avatar
ten2doyle102
I <3 E30's
Posts: 5462
Joined: Fri Feb 27, 2009 5:17 pm
Location: Appleton, WI
Contact:

Re: Modifying stock rear sway bars

Postby ten2doyle102 » Mon Jun 17, 2013 7:28 pm

Hmmm....I haven't attempted this yet. I will probably just saved up for the bigger rear sway. Just seems pricey for only a rear sway and some bracket albiet baller brackets....
Image

Return to “Suspension”

Who is online

Users browsing this forum: No registered users and 3 guests