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.

[groot]

Here's a simple front roll center calculation spreadsheet I wrote.

The geometry represented is not necessarily a stock layout, I guessed at it.

Anything in orange can be changed. Play with cell C5 (which is the height on the inboard lower control arm mount) and watch what happens to the roll center location (rows 34 and 35). In the current configuration, the inboard point of the lower control arm is 1 inch higher than the outboard point, resulting in some fairly reasonable roll center locations.

Now change C5 to 6.5 (1/2" lower than the LCA point, simulating a lower 914).

Attachment removed..... since it was gibberish.