BorgWarner EFR 6758 Turbo

The BorgWarner EFR 6758 Turbo is a higher flowing version of the venerable EFR 6258

The EFR 6758 is the middle turbo in the compact B1 EFR frame size. Ideal for use in single turbo applications for the 300-450hp range, or as twin turbo applications 550-900+hp. It suits a variety of applications from rally, drift, road racing, autocross, and street. The compressor wheel measures 53.9mm inducer with 67mm OD to support a 53lb/min max flow rate. The EFR 58mm turbine wheel is made of Gamma-Ti for low inertia and is an optimal match for the compressor wheel.Ceramic Ball Bearing only, watercooling recommended but not mandatory. 

Originally designed for the Chevy Indycar team, this turbo is popular for Mazda Miata, Subaru WRX and small displacement UTV (RZR, X3) and Snowmobile or Jetski applications.  As a twin turbo it works great for 350Z/370Z, Ford EcoBoost 3.5L and Porsche.  It's also a direct plug-n-play for Nissan SR20DET and other T25 based setups.

Compressor Specifications

• Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
• Compressor Wheel OD (exducer): 67mm
• Compressor Wheel Inducer: 53.9mm
• Max Flow Rate: 53 lb/min
• Built-in BOV: All EFR compressor housings incorporate an integrated BOV.
• Compressor Housing: 2.5" inlet, 2.0" hose coupler outlet

Turbine Specifications

• Turbine Wheel Diameter: 63mm
• Turbine type: Mixed Flow Aerodynamics
• Turbine Wheel Material: Low Inertia Gamma-Ti Turbine Wheel
• Stainless Steel Cast Housing
• 0.85 A/R Vband or T25 -OR- T4 twinscroll 0.80 A/R
• Turbine outlet: GT-Vband (aka small 3" vband) ~92mm OD for all EFR turbos

Features

• Dual Row Ceramic Ball Bearings - lowest friction and fastest spool/response, most extreme durability, built-in 2mm oil restrictor
• Watercooled Center Section - watercooling is recommended, 14mm banjo bolts
• Double seals on both turbine and compressor end for extreme durability and resistance to any oil seepage
• Boost Control Solenoid Valve Integrated to Compressor Housing
• Integrated Speed Sensor mounting provision
• Optional Turbo Speed Sensor Kit
• Optional Turbo Speed Gauge

Why We Love It:

The EFR 6758 is a staple at Full Race.  It's a little beast that always wants to make boost.  Works great for a small displacement 4 cylinder or a high power twin turbo 6 cylinder engine.  If you have the room, the optional SX-E compressor housing will spool a little earlier and make a little more power - with increased surge margin.  

67/58 T25 0.64 A/R Photos:

67/58 T4 0.80 A/R Photos: