Silhouette Autosports adjustable rear control arms for S12 and Z31

Silhouette Autosports Adjustable S12/Z31 Rear Control Arms

This is a modification to the original rear control arms for S12s and Z31s. These arms compensate for negative camber on lowered cars and allow precise alignment of camber and toe.





The true benefit and reason I made these is not just to correct camber but to actually make the rear alignable. Here are my rear alignment specs before and after modifying my rear control arms.

Before: (Lowered car. Toe adjustment maxed out towards negative.)
left rear---------right rear
camber:-3.6----camber:-3.3
toe:0.17---------toe:0.20
------total toe:0.37

After: (Arms were installed and the car was LOWERED TWO MORE INCHES and then aligned.)
left rear---------right rear
camber:-1.9----camber:-2.0
toe:0.04---------toe:0.05
------total toe:0.09

Alignment How-To Guide: http://club-s12.org/retro4/index.php?topic=37458

They've been tested on the track and street. No problems have occurred.

I'm located in Las Vegas, Nevada, USA

Price for the mod is $200 plus return shipping. If you need me to source control arms locally its an additional $100. I can also install polyurethane bushings for another $50.  Local installation and alignment service available.  Domestic shipping for both arms is typically $100-$150.

I can also make and ship you just the adjustment brackets. Then you cut your control arms and weld the brackets in. They are $145 shipped domestic and $195 shipped international

Control arm cutting guide: http://club-s12.org/retro4/index.php?topic=37359

Adjustment brackets



Wait time for arms or brackets is 4-6 weeks. These are made by hand on my days off from my day job.

All purchases come with Silhouette Autosports stickers. T-shirts also available.

PM me or like and message (faster response) the Silhouette Autosports facebook page. https://www.facebook.com/SilhouetteAutosports

Thank you.

Product of the Year Award....bad ass!!

Thanks. Its the best bolt-on solution. My car drives MUCH better now

I'm hoping to order these sometime after March. I have a drift day at the end of March, my rear camber sucks at the moment, hoping it wont make the day suck lol. First time on track with the S12, last time there was in my turbo Miata, so pretty big difference there lol. Wanting to do this with Z31 arms so I get a double upgrade at once. Great stuff man.

as per my post in the build, here are some pics of the final results

http://club-s12.org/retro4/index.php?topic=33168.msg397669#msg397669




Here is how she looks.

Thanks for posting Gary.

Heres the full photo album on the Silhouette Autosports Facebook page. https://www.facebook.com/media/set/?set=a.650712234992160.1073741839.515823818481003&type=3

The alignment screen photo really tells the whole story. Garys rear alignment is better than mine and better than any IRS S12 or Z31. His control arms were cut at 93 degrees instead of 90 like mine. To know exactly what I mean check out the Control Arm Cutting Guide (http://club-s12.org/retro4/index.php?topic=37359)

S12Monkey on 02:06:38 PM / 26-Feb-14I'm hoping to order these sometime after March. I have a drift day at the end of March, my rear camber sucks at the moment, hoping it wont make the day suck lol. First time on track with the S12, last time there was in my turbo Miata, so pretty big difference there lol. Wanting to do this with Z31 arms so I get a double upgrade at once. Great stuff man.

what size are the bolts that you are using for adjustment?

5/8" same as 16mm

Unwelded adjustment brackets by customer request



If you havent already be sure to check out and like the SilAuto Facebook page https://www.facebook.com/SilhouetteAutosports

This.....
I will have to do.
But probably around the end of summer.

Heres how to bend you brake hardline thats mounted on the rear control arm. Gently bending it by hand it the best way to do it.

I made a guide for doing your alignment with these control arms here: http://club-s12.org/retro4/index.php?topic=37458

I gotta get a set of these eventually. omg.

Thanks. I havent been doing much with SilAuto lately but I'm still here.

Andy's control arms. He got brackets and did the arms himself. Check out the stance shot. Rear camber looking great. Solid axle status

Sale me brackets before you leave!!!!!

Sorry I cant make any. Cost of shipping for them is only about $15 so after I get settled out east and have a work space again I'll be able to make them.