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Should rear wishbones be level with the bottom of the chassis?
speedyxjs - 9/3/08 at 05:15 PM

Iv made a frame to support my diff which the wishbones are attached to but they are a couple of inches above the bottom rails of the chassis. Does this matter or do i have to rethink it?

Ivan - 9/3/08 at 06:37 PM

Presuming you move the top wishbone mount the same amount then the main change will be in the roll center height with all it's implications.

If you don't move the upper wishbone mount to suit then everything changes - generally for the worse.

kb58 - 9/3/08 at 07:47 PM

The suspension pickup points are determined back during the design phase. Find the pickup points and design the chassis from there, not the other way round.

speedyxjs - 9/3/08 at 08:45 PM

quote:
Originally posted by Ivan
Presuming you move the top wishbone mount the same amount then the main change will be in the roll center height with all it's implications.

If you don't move the upper wishbone mount to suit then everything changes - generally for the worse.


Sorry i forgot to mention, i am using the jag diff and bones so there is only the lower bone and the driveshaft acts as the upper wishbone.

kb58 - 9/3/08 at 10:34 PM

Same answer though, the arms should go where designed, not to a convenient tube nearby.

Making the bottom A-arm non-parallel to the (assumed level) bottom rails means that anti-dive is being increased or decreased.

[Edited on 3/9/08 by kb58]