I just found this: Norgrove says Racer 5's success is due to consistency from batch to batch; use of American grains and "the three C's' - Cascade, Chinook and Columbus hops -- from Yakima Valley in Washington state, and fermentation using a house yeast strain that originated at Sierra Nevada Brewing Co. in Chico.
Rumor has it that WLP001 is a Sierra Nevada strain as well, so it fits.