Rear Lower Control Arm Relocation Brackets?

[TPI Monte SS]

My car handles great, but I'd like to improve the straight-line launch. Anyone have any experience running the LCA relocation brackets on a C4L rear suspension? I know they're supposed to improve the launch by changing the instant center, but will they negatively affect handling around curves?

Feedback is appreciated.

[Chevy350]

I thought I'd give it a go, but bear with me my weird english...

Yes, lowering the rear LCA mount is an easy way to gain som anti squat, but there are some things you should think about.
One thing is SVSA length, just make sure it doesn't get too short as you probably know rear brake hop is no good.

My biggest concern is roll steer. If you look at this drawing from Milliken: (The only one I could easily find, just pretend the PHB and UCA aren't there)

What's interesting here for you is the point "A", which is the point where lines drawn through your UCAs meet in side- and plan view. The LCAs and roll axis should apply to your car. The problems appear on your car because of the low skew angle in the LCAs make point "B" much further ahead and up higher than on that drawing. Depending on your LCA angle in side view, you could have roll- understeer or oversteer. A typically lowered C4L will have roll understeer with level LCAs. (More info: see the PHB/wattslink thread in the "Advanced"-forum)

Then watch this:

And you realize depending on your ride height and LCA skew, point "B" will change height quite a lot, when the rear LCA mount is dropped ~2" like it is here. If point "B" ends up higher than "A", you'll have roll oversteer, and that you should try to avoid.

My opinion is that you should just go ahead and make the lower mounts on your rear axle, but don't leave the LCAs in the lower position when driving on the street or on the track. Again, all this depends how far you drop the LCA mount, your skew angle, ride height and so on. I have never measured the rear suspension on a G-body, so I can't say anything for sure - I just want to give you the idea what to look for if you decide to try this and consider driving it like that on the street.

Did this come out as clear as fog? If so, I'm sorry. Just try typing the replys in german, and I guess you'll understand

Now it's time for all the good people that actually do this on a daily basis to reply and correct me, I just hope I gave you some idea on the subject.

[TPI Monte SS]

Wow, thanks for the input! I understand perfectly, no worries about the translation.

I've done a little research on another forum, and found that Norm Peterson and Marcus (two members on this forum as well) gave some good input here - http://www.montecarloss.com/cgi-bin/...;f=18;t=002572.

I think I'm going to pick them up. I have a good friend that is a welder by trade, so it should be no trouble to get them installed.