Yeah, then I've seen the Street TDs and thought they looked pretty
good, Tony Garmey had a set on the Corvette last weekend that I was
lusting after. Too bad they don't make a 15.
I'm sure the weight makes a big difference with the Speedsters. I've
never seen such a sensitive tire, even the slicks on my Radical were
more forgiving. At roughly 18 pounds cold / 20 hot on Peyote they
give very even temps across the face but are .5 to 1 second slow. At
19/21 they pick up the second and are a little hotter on the inside
edge and middle, at 20/23 they lose a second and are hot in the middle.
Once they heat cycle out they become completely stable and will last
forever on Peyote but they are two to three seconds slow. When I
decide I need those three seconds they cost me $800 bucks.
Incidentally, temperatures and pressures at the end of a session are
all but worthless unless you're getting the reading at the pit wall.
And you need to pick your track to get the best results. PIR for
example, has a long back straight, then two relatively short turns
that put almost no heat into the tire. So readings at PIR are
worthless for camber because the outside edge gets too much cooling.
Pacific Raceway has a right,left, right combination followed by a
short climbing straight, a left and then a carousel called Big Indy--
good for camber checks. Even better is a skid pad.
On Jul 13, 2009, at 4:48 PM, Bob Adams wrote:
> The Street TD's are the same compound/design as the Vintage TD's,
> but they are molded without any tread save for a couple grooves that
> run around the circumference of the tire. When asked if Hoosier
> would make a 205/60/15 Street TD they basically said that they
> "weren't interested".
>
> The Speedsters are ok tires, but the fastest SVRA Group 3 legal tire
> they are not. We pull pressure and temperatures after EVERY session
> and have tried everything as far as pressures go. As for alignment,
> keep in mind that your car is a couple hundred lbs lighter than the
> production bodied cars (SVRA min. weight is 1950# for the TR3-4's).
> Tire for tire, they are not on the same speed level as the Street
> TD's and the other decent radials. It also doesn't help that the
> fast radials are manufactured and are vintage legal in 205/55/14
> where the 15" cars are stuck with 205/60 (that's a .4" difference in
> sidewall !). This isn't an issue for most, but when you are racing
> for the podium in 50 car fields it is.
>
> Bob Adams
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