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Chrysler Crossfire
Wheel Camber, Caster and Toe-in angles


This is one information page of my collection of what I have repaired on my Crossfire.

Note:
You should not do any repair on your car if you don't have enough experience and knowledge! You use this information at your own risk! Don't blame me if something goes wrong.


Content:

Crossfire share most of it's chassis parts with Mercedes SLK R170 with the 320 engine.

Wheel camber, caster and toe in/out angles

This three angles control your wheels, they have to be adjusted properly to give the car a good handling and low tire wear.

You can get more information from the Wikipedia page here:

Chrysler Crossfire, Wheel camber, caster and toe in/out angles

3, DIY Toe-in angle meter

Ideas how to built a Toe-in angle meter that doesn't cost a lot of money and is easy to use:

The earlier Toe-in angle measure I did with a laser pointer worked but was a bit difficult to use. Is there a way to built some instrument that use some other principle. As an educated Astrophysicist I am and knowledge of 3D-CAD design and having a 3D-Printer it must be possible, or ?


Wheel Toe-in angle

This is how I did the toe-in measurement earlier, three distances and calculations.


I think almost all professional wheel angles instrument use lasers and mirrors today. High precision and expensive instrument that measure all wheel angles. I only need to measure the Toe-in angle and that make it a lot easier. Here is a sketch how I thinking with a standard method to measure angles.

Wheel Toe-in angle

Measure 1:
With a mirror attached to the left wheel and adjust the laser so its reflection from the mirror hits the laser source.
Measure 2:
Move the mirror to the right wheel with out moving the laser. Now the laser beam will not hit the laser source if the angle between the wheels is not zero.

Later when I did this I started with the wheel that was closets to the Laser. A warning about Laser which I'm sure you already know, don't look into the Laser, it can hurt your eye.

With a paper scale at the laser stand with the angles I can read it direct without calculations. The laser must stand at the same distance from the right wheel all time to get this to work. Longer distance get higher precision, about two meters will be enough.


3D-CAD of needed devices:

Wheel Toe-in angle

With FreeCAD I design two brackets for the tube that hold the mirror. These two points line up the tube with the wheel. A screw clamp around the tube to not let it rotate.


Wheel Toe-in angle

At the other end of the tube is the mirror holder. It must go down under the car so the laser beam has a free passage. I made it adjustable, the long slit. It could be a bit longer but my 3D-Printer can't print longer details then 230 mm. I plane for a mirror size of 100 mm, square or round.


Wheel Toe-in angle

The laser pointer bracket. In the lower rectangular pocket I put a angle scale, something about +/- 1.5 degrees, the range depends of how far away the laser bracket is from the wheel.


Wheel Toe-in angle

This old laser pointer was something I had in my boxes, now I got some use of it.


Wheel Toe-in angle

I took the tube from some scrapped cleaning equipment, it has a diameter of 22 mm. I must also design something that clamp it to the wheel.


Mirror:

Wheel Toe-in angle

My mother in law had an old present gift in her boxes. She offered it to me for my repair of the car.


Wheel Toe-in angle

It has two mirrors, I use the square mirror to the right. To take it apart I need to remove the pin that hold the two halves together.


Wheel Toe-in angle

In some way I must attach it to the instrument and its mirror holder. I can maybe glue a screw on the backside of the mirror.


Wheel Toe-in angle

I glue the screw to the backside of the mirror. The nut and washer in the background I use to lock it to the mirror holder.


Wheel Toe-in angle

With the mirror mounted on the mirror holder arm it looks like this.


Wheel Toe-in angle

From the backside with the nut and washer that hold it in place. I can move the mirror up and down to clear the car's protruding parts below the chassi.


Wheel Toe-in angle

The 3D printed bracket that hold the laser pointer and an angle scale.

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