report on the Yo' Mama A032 R tires at the track (long)

[Burl Vibert]

Tessie McMillan wrote:

> I'll spare you the minute-by-minute report, but suffice it to say that I
> drove my new tires at our Alfa club track event today at SIR. I started
> high. I lowered by small increments. When I lost steering input I lowered
> the fronts more. Since I thought it would be a hot day, I started at 42 and
> never went below 39 on any wheel (although I tried a heckuva lot of
> combinations in between.) But I still ended up chunking my right front tire
> during my second session, so I had to stop in the middle of the day, sweat
> over a hot floor jack, swap my right-side wheels and then tweak the
> pressures all over again. In the end I gave up, and left the pressures at a
> spot that made the tires drive like butterballs again. (I just pretended I
> was driving a go-kart.)
> 


Hi Tess

I would say you started about 17psi too high.  I haven't used them
myself (I know better) but I think cold starting pressures should
usually be in the mid-high 20's for track use.  Hot or autocross
pressures should be in mid 30's.

PS, for a good street/track tire you may want to try the Toyo Proxes
RA-1.  Longer wear and better grip than the Yoko.  Great in the rain
when left at full tread.  I'm using Kumho V700's now, gained grip but
lost some wear, I use them when a timer is running, the Toyo's when
just playing around.

Burl Vibert
1987 5000cstq
Kingston, Ontario