by Audi1 » Wed Nov 02, 2016 4:46 am
I have a similar, repeatable observation on my routed wood track. The best grip comes from silicone tires (we just got finished running the CanAm proxy cars from the SCI board and one of the P-Class cars set a new track record of 5.520 seconds). Next fastest on my track is rubber; particularly the NSR Supergrips and Ultragrips.
Third fastest, but a long ways back, is urethane. I've tried Paul Gage PGTs and XPGs, Luf's urethanes and D'Art Hobbies urethanes. All had similar results. The truing/profiling/preparation recommendations from other posters are good; the smoother the surface of the urethane tires, regardless of the manufacturer, the better the grip on my track.
I'm prepping a urethane-shod Carrera DTM car now for the Carrera Scramble proxy and having worked most recently with my Group 5 NA car, which is on NSR Ultragrip rubber tires and which runs laps in the mid-5 second range, I started my testing of the DTM car yesterday afternoon - with poor traction and high 6 second laps. I have a lot of work to do on that car..............!
I really like urethane tires from the standpoint of truing them. But, at least on my track, they are grip-challenged.
When I see posters say things like: nothing beats the grip of urethane tires on my track, I just shake my head and wonder what I'm doing wrong............
Allan