Originally Posted by teknorc
I ran 45 shore which is in line with the recommendation on the website for our temps (around 80 degrees). What would you have recommended?
Our temp guide page on our website has more than just numbers & temp ranges on it. The great news is that your track doesn’t add anything traction additives and this is excellent for natural rubber tire traction.
Here are few ideas and questions that will help more.
First, what did the tires actually do and when in the run did they do it?
By this I mean, did they start off loose and get somewhat better as the run went on and the rubber heated up?
Did they start off good and loose traction as they warm up?
Both of these questions help determine not only shore for track temps, but for the way your track layout generates heat too.
Every time your car turns, friction generates heat. When real rubber gets “overheated” it looses traction just like real 1:1 racing.
Next up, what does the actual slick surface look like after the run?
This is the greatest indicator of what’s happening to the rubber and how your car’s suspension is working. You’d be surprised at how many racers have “camber” problems and the tires show it by wearing on an edge.
If the slick is riding on its edge most of the rubber is off the ground when it’s needed most and this condition will overheat the part of the slick taking the beating.
The slick’s contact patch should show the majority of its wear in the center.
Another thing the tires will show you is the rubber’s actual condition after the run. “Overheated rubber usually shows “tearing” or “graining” on the contact patch area.
If the car’s camber for your track is correct and the “graining” is in the center of the slick, then the rubber is getting cooked, which signifies shore rating is too soft.
If you find that the car’s suspension is providing an excellent contact patch area wear pattern and there is no sign of overheating on the rubber, then it is very possible that the shore selected could be too hard or the foam insert could be incorrect for your track.
Our medium foam inserts do a few things to our slicks. They allow the rubber to generate greater heat, they allow it to build quicker because of higher friction, they allow for more of a contact patch area. Softer foam increase rubber wear rates too.
Some of our customers prefer our medium inserts because they offer a wider “tuning window” and this helps them dial-in easier.
Once all of this has been determined for your track, GT racers won’t have to guess about what will work best for them too.
This is why we feel it is very important that our dealers are GT racers too. Our better dealers all use our products and this provide us with the best feedback possible to help their racer customers.
Hope it all helps & sorry for the long post.