Project Anchor (68 Firebird Coupe)

[blitzer454]

Time to re-visit the front end alignment. As you may recall I am using a Flaming River power steering rack and pinion with the original steering arms. I'm also using hubs from Kore3. I want to see how bad the bump steer is with this setup compared to stock settings and the ridetech Tru-Turn setup that uses a stock steering box.

I dialed in the camber, caster and toe settings the best I could before measuring bump steer. I made a tool to measure the bump steer from a piece of MFD board.


I used my folding table as a flat stationary plane and a bolt in the brake caliper bracket to prevent the board from rotating on the spindle. I then measured the distance from the front and rear (spindle center point) of the board to the folding table then subtracted these values to obtain the toe-in/toe-out values as I compressed and de-compressed the shock from the middle riding height in one half inch increments. I used a wire mounted to the subframe as a pointer to the board. This method may not be as accurate as using a tool designed specifically for measuring bump steer, but this is free whereas the tool is kind of expensive for something I probably would only use twice.


I found a good thread on this forum that had some data of the stock settings before and after installing the Tru-Turn hardware. From that data (columns A and B) I added my own measurements for comparison.


It appears that the Flaming River is pretty close to the stock bump steer and of course the Tru-Turn looks much better. Sooo that means I'm going to forget that I ever seen this data and keep the Flaming River setup for now since this car is primarily going to be driven on the street. I may however change my mind once I attempt to get the engine and headers installed. Comments?? Is there an inexpensive way to improve bump steer?