10-17-2010, 05:38 PM
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Senior Club Cobra Member
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Join Date: Jun 1999
Location: Fallbrook, CA USA,
CA
Cobra Make, Engine: Porsche 928 S4
Posts: 739
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Not Ranked
Machiavelli,
I strongly suggest that you allow the roll Bar to be a proper functional piece.
The four point unit as designed works well and is an integral part of the rear cross-member design as well as the mounting point for the shoulder belts.
The only problem with the 18 inch wheels is the change in actual chassis wheel rate.
The spring rates may have to be lowered by the percentage of the increase in tyre sidewall stiffness.
As well a damper valving.
But this also depends on the tyre construction.
You are just going to have to get the sidewall design details from the tyre manufacturer once you pick what you are going to use in order to calculate the required spring and damping rates.
May not be an issue at all.
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