What is the point og having adjustable lower, and what should you adjust them to.
thx

 

The best thing about adjustables for me is that I can move the rear wheel in the wheelwell. Comes in handy when running a 28" tire.

 

Is there a lenth i should adjust them to for better performance

thx

 

There's no real affect on "performance".... the LCA's serve one function - to push the body of the car forward, in response to the torque applied at the rear wheels. That's it. The pinion angle is set with the torque arm, adjusting the LCA's won't do that. There is a minor affect on the "instant center", but I really don't see that as a big issue. There was an extensive thread on "instant center" about a year ago on Advanced Tech, if you want to do a "search".

The only possible use for the adjustable LCA's (other than moving the axle when using large tires) is in adjusting the "thrust angle". The axle has to be exactly perpendicular to the longitudinal axis of the car. If it isn't, the "thrust" (force pushing the car forward) will be applied at a slight angle (not "straight ahead" as it should be) and you will lose performance. But it is VERY rare for the thrust angle to come out of adjustment on a solid axle suspension. Its more of a problem when you have independant rear suspension, where its possible to adjust each wheel individualy.

So.... if you were to buy an adjustable LCA, you would set it to the exact same length as the stock LCA. That's how Steve Spohn did it when he installed a set of his adjustables on my Formula. It was only later, when the 28" QTP's started growing enough at 125mph trap speeds, that I had to move the entire axle assembly back about 1/4" to gain clearance between the tire and the sheetmetal front edge of the quarter panel/wheel opening.

 

thx great info

 

Very good info indeed Fred. When I put my Madman's on, I took the old LCAs off, put a bolt through one end of both the old (Metco) and Madman LCAs. I then adjusted the opposite end so that the Madman's were the same length as my old Metcos. After installing them on the car, I adjusted as needed.

Haha, I remember the thread where that came from.