FD Mazda RX7 under drive pulley set - with idler

-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.

See our other listings for idler pulley kit on it's own.

Keywords: Mazda 12a 13b 20b ida rotary rx2 rx3 rx4 rx7 pp FD3S S6 S7 S8 bat batty REW TT Green Brothers Racing