Porsche 911’s have proven themselves to be excellent handling race cars. However, this did not prevent me to improve it. One very common way to improve the cornering speed of a car is to lower it. Also most people agree that a lowered car looks better too. One thing I hate are “stanced” cars that look like the wheels are broken. Too much camber is very common on lowered cars especially in the rear. Rear camber boxes are the answer.
How to Keep Camber in Check
Some negative camber is desired as every car will roll when pushed through a corner. Simplistically, when the roll angle equals the camber angle then the tire patch is optimal. The problem is this: My Porsche 911 runs out of camber adjustment range at low ride heights. Some performance 911 owners simply slot the spring plate holes to increase the range. My method is to raise the inner pivot point where the trailing arm attaches to the torsion tube. This modification allows me to adjust the camber in two places for more control.
A Higher and More Aggressive Roll Center
When the inner pivot moves up the roll center also goes up. The higher the roll center the less the car wants to roll. Less body roll makes the car feel more responsive. Porsche did something similar with the venerable 930 and 935 cars. Porsche also shortened the trailing arm which raises the roll center and increases the camber gain. I don’t have the ability to shorten the trailing arm or afford them, so I did the next best thing.
Obviously, I had to clearance the seat pans to accommodate the adjustable inner pivots. The roll bar in my previous blog deletes the rear seats anyway. Additionally, I may need to clearance more for the trailing arm motion. Also, I will close this hole when all the welding is finalized and the suspension fits.
I made a full video explaining roll center and how I determined how far to move the holes up. Please watch this now unless you are very familiar with this mod already.
Please watch this video if you want to see how I fabricated and attached the new camber box to the stock torsion tube. These raised boxes will also connect to the roll bar for extra stiffness. I can’t wait to troubleshoot and tune this car for the road and track!
Hey, very nice blog! Beautiful and Amazing. I will bookmark your blog and take the feeds also
I precisely desired to appreciate you all over again. I do not know what I might have followed in the absence of the entire recommendations contributed by you on such field. It was actually a very troublesome problem for me, however , finding out the very professional tactic you treated it took me to cry for delight. Im thankful for the advice and hope that you recognize what an amazing job that you are putting in teaching others using your blog post. I know that you havent met any of us.
Thanks for your kind words. I hope to do more blog posts here in the future when I get more time. I’m currently doing most of creating with video format on YouTube. I’m just hoping to get the car a bit further along and then come back to write more blogs! Thanks for the encouragement.