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Reply to "Subaru Beck Spyder, suspension..."

@edsnova posted:

Your car had one @RS-60 mark did it not?

@DannyP posted:

No, Mark had IRS that he designed and built.

I built a 5-link IRS.  I went this way because I didn't really know for sure exactly where I would need the rear tires to be planted once I started mounting the body.

Basically, the build was conceived by marking four dots on the floor where I thought the wheelbase should be, and then to build a car that would fit those four dots.  I thought at the time it was pretty ambitious (or naive) to believe that those dots would really hold up true through the project.  So when it came time to think about rear suspension it evolved that a 5-link would provide some reasonable flexibility to adjust wheelbase (shorter or longer), track (in or out), plus whatever I wanted for camber and toe.

Since I really didn't know what I was doing, I shopped around for ideas.  I ended up looking at the rear of a Lotus 49 and figured there's a guy that probably does know what he's doing; so, I (sort of) copied it.

Of course, if you copy a race car suspension it will probably end up riding down the road like a race car, which it does.  All your rear suspension connections (18 of them) are unforgiving, hard, no cushion heims.  So, when the road surface is not smooth, the harsh ride can get weary after a while.  On the other hand, when the road is smooth: 

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