The EFR 6758 is the mid-frame ball bearing turbo within the B1 series. It’s a popular choice because it is larger than the 6258, but smaller than the 7163. This is an advanced ball bearing turbocharger with Gamma-Ti turbine wheel technology which greatly improves spool-up. EFR turbos have the competitive advantage over other brands thanks to the lightweight turbine wheel material which cuts turbine inertia in half vs. Inconel. Gamma-Ti (aka Titanium Aluminide) is commonly used in aircraft turbine blades which provides strength and weight reduction. Since it requires less energy to accelerate the wheel, higher speeds can be reached sooner and as a result the on-engine boost response improves while the competition is reaching for the NOS button to catch up!
EFR 6758 is sized just right for single turbo applications making 250 to 550 HP or up to 1,110 in twin configurations! This turbo also is a top choice for 4 cylinder, 6 cylinder, single turbo setup, rotaries, twin-turbos V6 and V8s, and a variety of other race applications.
Features include:
- 179388 = B1 EFR 6758-A 54mm T25 Turbocharger | Iron
- Max flow rate: 54 lb/min
- Gamma-Ti ultra-lightweight turbine wheel
- Dual ceramic ball bearings with metal cage
- Forged milled aluminum compressor with extended tip
- Integrated compressor recirculation valve (blow off valve or BOV)
- Electronic boost control solenoid
- Water-cooled center section
- Bearing housing options: iron and aluminum
- Stainless steel turbine housing options:
- T25 Single Scroll = 11581009006 (0.64 A/R) or 11581008000 (0.85 A/R) internal wastegate
- T4 Twin Scroll = 11581008002 (0.80 A/R) internal wastegate
- V-band Single Scroll = 11581008001 (0.85 A/R) or 11581008003 (0.85 I Type Non-Wastegated)
- Sold in both turbocharger and supercore configurations
- Core assemblies, just the cartridge, can be purchased for quick repairs. This is the best method to make a repair as they come pre-balanced with new wheels which avoids the need for special rebuild tools (check that your end-housings are reusable).
All INDYCAR V6 engines (Honda and GM) come standard with twin EFR 7163 turbochargers! Boost your engine like the pros and choose EFR for your next build!
Not sure which size turbo you need? Visit BorgWarner’s Match Bot to which will help you properly pick the best turbo for your application and goals.
Product use: For off-road use only in performance race applications.
| EFR B1 | Comp Wheel OD | Comp Wheel Inducer Dia | Turbine Wheel OD | Turbine Wheel Exducer | Power Range HP | Twin-turbo Power Range HP |
|---|
| 6758 | 67.00 | 54.00 | 58.00 | 51.00 | 250 to 500 hp | 500 to 1000 hp |
| 6258 | 62.00 | 49.00 | 58.00 | 51.00 | 225 to 450 hp | 450 to 900 |
| 7163 | 71.00 | 57.00 | 63.00 | 56.00 | 300 to 550 hp | 600 to 1,100 hp |
Product use: For off-road use only in performance race applications.
P65 Warning