Years ago when I was paying attention to this stuff, road racers on slicks could pull 1.2g and higher without any special 'TrackBite'-like coatings on the track. I remember 2g in some situations, but I don't remember if banking was involved.
The theory behind coefficient of friction is based on a laboratory test of one material against another. Both materials are smooth. There is no rolling involved, just flat surfaces either static or sliding against each other. Theoretically you can't get better than 1g, which is borne out is tests under these conditions. Sticky tires are also soft and gummy, meaning they interlock with the pebbly surface of asphalt. I believe there is also an improvement from (slight) slippage due to overspeed on acceleration. This disconnect is a case of the model (the laboratory test) not matching the actual situation (rolling slicks on asphalt). The fact that street tires get a coefficient of 1 is probably a coincidence. They can't have the grip of slicks because that would require too many compromises. Like not being as gummy, so not as much interlock. Chris On Thu, Feb 11, 2016 at 3:52 PM, Bill Dube via EV <ev@lists.evdl.org> wrote: > > 2) It removes a thin layer of aged hard rubber, and reveals fresh soft >> sticky rubber. >> >> If it removes a layer of rubber wouldn't that also remove the TrackBite? >> > > They spray the track with TrackBite, not the tire. You do a > burnout principally to remove this aged layer of rubber, particularly on > the first run of the day. On subsequent runs, you can do a smaller burnout > to just heat the tire surface. > > For a national event, they spray the entire 1/4 mile length of the > track. For a local bracket race, they just spray the launch area. Maybe > 100 ft. Whole different procedure. > > Track surface preparation is an art. They first clean the track > surface with a rotary sweeper. Then they spray the track with a layer of > TrackBite. Then they apply a thin coating of rubber dust. Next, they > burnish the surface with a set of counter-rotating drag racing slicks. > Finally, they apply a very light final spray of TrackBite. > > When the track is prepared optimally, the traction (adhesion) is > so great that you will actually spall off little pieces of the underlying > concrete. Basically, the you exceed the shear strength of the pavement > material itself. > > Bill D. -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160211/44557989/attachment.htm > > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160211/16e2802a/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
