The EFR line of turbochargers was born out of an internal BorgWarner Turbo Systems program labeled Advanced Aftermarket Products or AAP.
The program was engineered by a cross-functional team that began with the proverbial clean-sheet of paper. No legacy products, no preconceived notions of what a turbocharger could or could not have; no restrictions. The aerodynamics for the product line were selected using a range of optimized combinations that would give users turbocharger solutions anywhere between 250 and 1000 horsepower capability per turbo. Next, a list of every notable design characteristic for an engine boosting device was tabled. Specific interest was given to new ideas that had never been formed in metal or had never been combined into an aftermarket turbo.
The result is the new EFR (Engineered for Racing) line of turbochargers from BorgWarner. These turbochargers contain a bevy of key attributes such as Gamma Ti turbine wheels, dual ceramic ball bearing cartridges and investment cast stainless steel turbine housings. Collectively, those features help give the EFR line its innovative appeal and will provide a breakthrough experience in durability, device responsiveness and installer/user satisfaction.
For a 360 degree view of the EFR turbocharger please click the image below (external site):
The BorgWarner EFR turbocharger is set to become the new world standard for performance turbocharging due to the high-technology feature package, unbeatable performance, and installation convenience.
- Low Inertia Turbine Wheel
- Dual Ceramic Ball Bearings
- Flexible Compressor Cover
- Forged Milled Compressor Wheels (FMW)
- High Flow Wastegates
- Ease of Orientation
For details of the full EFR feature package, click the sectioned turbocharger below (external site):
The EFR product line contains a compressor range from 62mm OD (~50mm inducer) to 91mm OD (~68mm inducer). From this, the 70mm through 91mm compressors are designed for high-boost (30+ psi) capability. Born from our work in highly-boosted, highly-efficient commercial engines, these compressors define “top-shelf” in terms of efficiency, range/width, and of course pressure ratio (boost) capability. On the turbine end of the machine, the range is from 55mm OD to 80mm OD. These turbine shapes are the newest “superback” and “fullback” designs from our work in high-boost, high-efficiency applications. These are low-stress designs capable of considerable speeds and high efficiency. The compressor and turbine “pairing” is what it should be to maintain the best turbine inflow incidence, and the turbine housing A/R’s are all selected to also optimize turbine stage efficiency.
The chart below graphically displays the rated peak horsepower capability per EFR turbocharger (external site):