Increase your E36 Dinan supercharger belt grip and boost with an original Dinan spec upgrade.
Dinan had a rare 10psi Intercooled Z3M ISR Roadster that used a 5.5" 8-rib crank pulley. This is a replica of that.
A standard E36 Dinan supercharger pulley is 5.14". Modest dimensional increase gains of 5.5" mean the potential for more boost if so desired. A standard E36 Dinan supercharger pulley has 6 ribs. Appreciable gains in belt grip and consistent boost pressure with this 8-rib design.
Plug and Play with the Dinan tensioner and pulley. Just add the 8-rib upper supercharger pulley and appropriate belt for your desired boost level and go.
Known working configurations
5.5" 8-Rib ISR Crank Pulley + 3.33" 8-Rib Vortech SC Pulley + Contitech 8PK1370 Belt. This is good for 10-11psi.
Modeled after the original ISR pulley. Machined in 6061 aluminum and anodized black. Includes new stainless steel mounting hardware. Applicable to both Vortech and Powerdyne based E36 supercharger kits.
For reference: A standard E36 kit uses a 5.14" crank pulley and a 3.43 supercharger pulley. This spins the charger at 37,763rpm to produce 6.5psi. To stick with a stock like boost pressure with the 5.5" crank pulley a 3.60 supercharger pulley will spin the charger at 38,500rpm for roughly 7psi of boost. For higher boost levels, up to 2.95" supercharger pulley can be used with the Dinan tensioner setup.