"w" will not work, so don't waste your time there. I was spinning thru 3 gears yesterday on a concrete runway with zero prep. I tried everything to get a good launch to no avail. I needed my drag radials, and that might have helped. yesterday sucked big time. car was running fine. data logger didn't record, so that was no help. Just wasn't my day. practice your launches, but you need tires that will hold the car, or you are wasting your time. I might as well had been on water yesterday as it was no different. try to go to tracks that race often that always have vt down. they are sticky, but you will need drag radials. I only had one good set of goodyear summer compound tires that gripped well, and they are no longer made. street tires summer compound are close, but won't match a good set of drag radials. My next set will be true racing slicks, and we will see what that does.