At a recent Grand-Am race at Barber Motorsports Park in Birmingham, Alabama, three teams waving the MAZDASPEED Motorsports Development banner put the pedal to the metal to raise funds for the American Red Cross Japan Earthquake and Pacific Tsunami Relief Fund. Each of the three teams - SpeedSource, Dempsey Racing and Team Sahlen - featured special graphics on their RX-8 racecars, inviting fans to support people affected by the March 11 earthquake and tsunami by texting a…