FD Mazda RX7 Underdrive Pulley Set with Idler

Green Brothers

- CNC Manufactured in-house from 6061 T6 alloy
- Black anodized (35 micron semi-hard for maximum life)
- Mitsuboshi 5PK belt

Benefits include air pump delete, reduced coolant temps, and a few extra HP. Suitable for both street and competition applications

A grooved water pump pulley eliminates belt slippage

Water pump overdrive is reduced from 1.3:1 to 1.05:1, Alternator overdrive is reduced from 2.2:1 to 1.7:1

Does not adversely affect alternator output at idle speed