Table schema:
CREATE TABLE table_name_10 (year VARCHAR, chassis VARCHAR, engine VARCHAR, rank VARCHAR)

Question: How many years has an engine of audi 3.6l turbo v8 and 1st as the rank with an audi r8r as the chassis?
SQL: SELECT COUNT(year) FROM table_name_10 WHERE engine = "audi 3.6l turbo v8" AND rank = "1st" AND chassis = "audi r8r"