June 21, 2021 – NMRA Tech Committee Statement on Limited Street Supercharger Pulley Measuring Procedure
The NMRA Tech Department will be using the following method to verify supercharger pulley sizes/ratio on JDM Engineering Limited Street entries. The supercharger and crankshaft pulleys will be measured where the belt is riding on the pulley, not the bottom of the groove. All pulleys will be verified using dial calipers.
All supercharged Limited Street competitors should be prepared for pulley size verification during the NMRA/NMCA Power Festival at US 131 Motorsports Park July 22-25 and/or during the NMRA World Finals + Holley Intergalactic Ford Festival at Beech Bend Raceway September 30 to October 3.
The 2021 Limited Street rules can be found here: www.nmradigital.com/dl/rules/ls.pdf