Oh noooooooooooo! Not another plastic car on the salt! Seriously,
welcome! You are correct in your concern about CG with the Vette. When I
was building my '85 Vette, the "old timers" warned me about the
aerodynamic center of pressure issue to avoid the "arrow flying
backwards" problem. If you have the stock IRS in the rear, you have
another problem as when lift occurs, the camber changes; if it goes
positive, a spin results. (you have noticed this when you jacked up the
rear end) I have been fighting this problem for years, and have gotten
around it by dialing in more negative camber. a 10-bolt chevy rear-end
would solve it once & for all...... If you have any solutions, I am all
ears.
As for tires, I am using Goodyear "NASCAR Superspeedway" slicks on the
rear and Goodyear Frontrunners up front. Both readily available and good
up to 250 mph (so I'm told!) I have been using this combination for 6
years with no problem except the rears show heat on the outside edges
but still have many runs left on them.
Hope this helps........
Ed
Gene Halvorson wrote:
>
> Both Darrel Ferguson and Thomas Bryant have raised some issues that perhaps
> they can expound on. I am running a big-block 74 Vette. It has a later
> model "duck-tail" type spoiler. I didn't consider the pocket that is
> created behind the car. Does anyone have any pros/cons about a spoiler
> versus a wing?
>
> The issue of CG and traction makes me wonder what is the ideal point of CG?
> I would suppose it depends on the frontal and rear loading of the
> aerodynamic factors of the individual car. I suspect the Vette has a
> pretty high frontal loading and a much less rear because of the shape. I
> will balance the car to find out just where the CG is but how do you
> calculate where it should be with the loading factors? I'm sure this body
> style has seen the salt hundreds if not thousands of times. I'm a newby so
> if anyone has some experianced insight, I would appreciate your comments.
>
> Also, I am having trouble finding a vendor for tires here in Minnesota that
> understands what I need. 3500 lb car and low 200's mph. Any sugestions?
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