Another option, since your car is pretty light, is to
try a narrower tire. With the width of the contact
patch on your 265-section Kumhos, you're probably
needing such low pressures because you can't get
enough heat into them.
Also, if you go to, say, a 245/45-16 tire, you'd see
better acceleration due to the tire being shorter,
although I doubt this is much of a problem with a
Cobra. But I'd try narrower tires before trying
anything too radical with the suspension.
Scot
--- david borden <cobracrosser@jps.net> wrote:
> Kevin,
>
> I seen to have a similar issues on 265 45 16 Kumbos.
> My car in not quite as
> light, but is still fairly light at 2200lbs. I have
> had the same problem
> trying to get the tires to stick. I suspect it is
> my setup, but I had to
> run just below 20psi to get the tires to stick, but
> they corded the edges
> after 4 events.
>
> The tires I got were new but 2.5 years old from
> storage. Are you tires new
> , or older models like mine?
>
> I wonder if they may need a bit more weight on the
> tires to get a good
> contact patch.
>
> keep us updated on your progress.
>
> David Borden
>
>
> -----Original Message-----
> From: KWall73108@aol.com <KWall73108@aol.com>
> To: autox@autox.team.net <autox@autox.team.net>
> Date: Tuesday, May 16, 2000 7:00 AM
> Subject: Tire analysis and question
>
>
> >From last weekends testing 265/45/16 radial Kuhmos
> were three seconds
> slower
> >than 11.5" bias ply slicks on the same car on a
> fifty second course.
> Using
> >the winning 98 Nationals ASP and AP times as a
> reference, the DOTs should
> >have been about a second slower than the slicks.
> >Unless the Kuhmo pressure is dropped in the sub
> twenty psi range the whole
> >contact patch isn't usable given the car's 1700 lb
> weight. However, the
> >Kuhmo performance drops drastically with these low
> pressures unlike the
> slick
> >due to sidewall characteristics.
> >Would a 315/35/17 radial perform better than a
> 265/45/16 radial at a sub
> >twenty psi since it has less side wall to distort?
> >
> >Kevin Wallace
> >
>
>
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