Incorrect Info in Response to 38566
#38899 from Doug Piner · Not recommended · Minutes (2025-10 Fastrack)
Thank you for your letter. The current 50lbs difference between the 2.5L Z4 and 2.5L Z3 is fair until additional data and results
prove otherwise. They are not the same car, with different suspension design, bodywork, and aero drag (increased frontal area
does not always increase aero drag). The brake sizes are very similar, and both are permitted the same max 18x8 wheel
width. If there are concerns with sourcing a 17" or 18" racing slick, then consider running a 15" wheel like most current BMW Z3
and E36 racers in EP are doing.