914 Suspension motion ratios, Comparing notes Options

[groot]

I measured my front and rear motion ratios yesterday and wanted to compare notes with any that have done the same.

For the rear suspension I took ~20 data points and did a best fit analysis to come up with 1.00 to 1.00 damper travel to wheel travel with strong statistical correlation.

My front geometry is a bit different than a standard 914, so the motion ratio should be different, too. I measure ~10 points and found 0.83 damper travel to wheel travel, again with strong statistical correlation.

I'm about to order my rear shocks and this is one of the bits of data they need to build the shocks.

[Thorshammer]

Kevin,


What do you plan on using for shocks????
I like the Ohlins

Slivel,
Y
ou may find the RC will be high, especially in the rear causing the instant axis from front to rear to be much higher in the rear. This causes a number of issues, Brad may feel different, but I have found 2.5-3.0 inches of rear suspension pick up point movement (up) to fix this and restore the rear trailing arm angularity. This will make the rear of the car much more compliant while enabling you to lower the rear RC to an acceptable point. This will make the IA similar front to rear althought the MA will change due to the difference between Struts and trailing arms.


Erik

If you really want something good, add 4.5 inches to the front a-arms and relocate those points 2.0-2.5 inches up. Then add 2.5 degrees to the strut knuckle angle and reposition the front camber plate. This will give you almost 0 scrub and a better camber curve, and allow for the proper amount of front track, well at least in my class. This is my plan for next year when the car gets a rebuild. Kevin is on the right track with his front suspension. But, he may find the rear pick up point change will give him immense benefits.