Kenny Brown Rear IRS - Cobra

Now we just need to find someone capable of building a similar setup for our cars! I don't think Kenny has the time unless someone wants to front the money for the development work themselves.

His shop is building a 2003 CSR Mustang for Joe Graziano of NST-Racing in Chicago specifically for the Speed World Challenge Series. There are quite a few pictures on their build up at his website.

http://www.kennybrown.com/News.html#May 10th

There was an article about this set-up several months ago in M&FF if memory serves. The problem is getting someone knowledgable to determine the parameters required for the system. Specifically where the mounting locations for the control arms need to be as well as the spring rates to be used on the coil over shocks. (As you move the shock/spring location you affect their "mechanical advantage" or effect. One of the reason the OEM rear spring rates are higher than the front spring rates even though the majority of the car's weight is on the front end.)

Also note the upper control arms are a wishbone design too which would be desirable since the arm could handle suspension forces better helping to keep the wheel properly located as opposed to the T Bird design where the arms basically locate the knuckles upright and can not resist fore and aft movement well.

The article noted you could use Kenny Brown's arms with the OEM Subframe. You could modify the subframe mounting points to get better performance or you could buy the entire subframe and arms for the entire package. The Kenny Brown subframe had multiple mounting points for ride height adjustment as well.