ISR Performance - Turbo Oil Restrictor -3AN .

The ISR Performance turbo oil restrictor is a -3AN male fitting with a .036 inch orifice that threads into the oil feed port of ISR's dual ball bearing turbochargers. Ball bearing cartridges need a much smaller volume of oil than a journal bearing turbo, and feeding them unrestricted pressure will overfill the center section and push oil past the seals into the compressor or turbine housing. This restrictor is the required fix.

Specifications

• .036 inch restrictor orifice
• 7/16-24 thread
• -3AN male outlet

Use with

• ISR RSX3076 turbo (IS-RSX3076), 400 to 600 HP
• ISR RSX3582 turbo (IS-RSX3582), 500 to 750 HP

Not for journal bearing turbos

Do not use this restrictor with ISR journal bearing turbos, including the IS-RS3871 and IS-RST25/28. Journal bearings rely on a full volume of oil to support the shaft, and restricting the feed on one of those turbos will starve the bearing.

Installation

Thread the restrictor into the turbo's oil inlet, then run a -3AN feed line from your oil source to the restrictor. Make sure the oil drain is unrestricted and routed downhill to the pan above the oil level, because a restricted feed only works as intended when the drain can flow freely. Prime the turbo with oil before the first start.

All ISR Performance products are designed for off-road use only.