I have some rear uprights (Purchased from a company although i wont say who). Im thinking for the wishbones to go un eQual non parrallel. Is the best way ( In cad to start) Devise some diff mount place the uprights at the correct distance and just play around untill i get the desired effects in bump and droop or are there formulas for these thigns? Cheers.

Theres some IRS plans on my website, drawn by Rorty.

They would be a good start if you want to go onto making your own.

David

What I did:

A. Positioned top and bottom outer pivots as required by upright
B. Made lower WB horizontal and as long as practical.
C. Making upper WB lenght approx 2/3 of lower WB, and with estimated swing axle length (of your choice), positioned upper inner WB pivot point.

My swing axle length was arrived at by researching existing cars, reading Staniforth etc

Cheers

Fred WB

[Edited on 10/3/06 by Fred W B]

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Originally posted by jon_boy
I have some rear uprights (Purchased from a company although i wont say who). Im thinking for the wishbones to go un eQual non parrallel. Is the best way ( In cad to start) Devise some diff mount place the uprights at the correct distance and just play around untill i get the desired effects in bump and droop or are there formulas for these thigns? Cheers.

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Jon boy, check your u2u box, may find a usefull drawing in there.

cheers J.

Fred's advice on how to go about things is pretty much how I approached the actual design process.
If you have access to any form of CAD you will find it invaluable for modelling your ideas.
Most importantly though, do your homework, read as much as you can, I too would recommend Stanniforth and Des Hamill.

Mick