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I built a five bar rear suspension similar to the C4 model. I used the longest toe control rods I could fit and set them for the minimal amount of toe-in on compression as possible. By measurement I get about 0.8 degrees of toe in from a normal resting position to full compression. which on 25 in diameter tire gives about 0.175" of toe change from ride height to full compression.
Unfortunately this seems to be far too much. When I hit a bump, the resultant toe steer is so strong it really pushes the rear of the car around. A bump on the right side pushes the rear left and vice versa. It is scary actually and I can't leave it like this. There is limited room to decrease the toe change a little more, but everything I have read, (and that is a lot - so much for self study!) says toe-in on compression is a desirable thing. And I think if I set the toe control rod closer to parallel at rest, I risk going to toe-in at partial compression to toe-out at full compression. So I really don't know where to go at this point and I don't really like driving it the way it is.
Here is a shot of mine.
Here are shots of a couple of others that really take the toe change to opposite ends of the extremes.
This one would have a LOT of toe-in on compression
And this one would have toe-out on compression
Maybe somebody here knows how much toe change a stock C4 suspension produces? I checked the C4 forums and there does not seem to be too much hard technical discussion over there. Any ideas?
Unfortunately this seems to be far too much. When I hit a bump, the resultant toe steer is so strong it really pushes the rear of the car around. A bump on the right side pushes the rear left and vice versa. It is scary actually and I can't leave it like this. There is limited room to decrease the toe change a little more, but everything I have read, (and that is a lot - so much for self study!) says toe-in on compression is a desirable thing. And I think if I set the toe control rod closer to parallel at rest, I risk going to toe-in at partial compression to toe-out at full compression. So I really don't know where to go at this point and I don't really like driving it the way it is.
Here is a shot of mine.

Here are shots of a couple of others that really take the toe change to opposite ends of the extremes.
This one would have a LOT of toe-in on compression

And this one would have toe-out on compression

Maybe somebody here knows how much toe change a stock C4 suspension produces? I checked the C4 forums and there does not seem to be too much hard technical discussion over there. Any ideas?