The turbos use Gamma TiAl (titanium aluminide) turbine wheels, ceramic ball bearings, as well as stainless steel turbine housings. The IndyCar engine producers can select from singe-turbo or twin-turbo versions, each with two turbine housing sizes.
"Streamlined EFR turbochargers for IZOD IndyCar Series feature low-weight Gamma TiAl turbine wheels and shaft assemblies for quick boost response. Patent-pending ceramic ball bearings increase thrust capacity and durability while improving turbine efficiency at low expansion ratios. An investment-cast stainless steel turbine housing also increases efficiency, improves durability and resists corrosion," a BorgWarner statement explains.
This line of turbochargers was originally designed for performance enthusiasts and have been customized for the IndyCar racing series through weight reduction techniques, as well as end-housings that are custom-made for this series, which has special output and durability requirements.
"A testament to BorgWarner's technology leadership in turbocharging, this product is engineered to meet the demanding performance requirements of IZOD IndyCar Series racing. BorgWarner's EFR turbochargers offer an unprecedented combination of advanced technologies, designed to boost the performance of down-sized engines while improving fuel economy," said Timothy M. Manganello, Chairman and Chief Executive Officer, BorgWarner. "We are thrilled to add our latest turbocharging technology to our 100 year legacy of innovation at the Indianapolis 500."
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