Borg Warner EFR 6258 Turbo (225-400 HP) - T25 Flange

T25 Inlet, 3" (92mm OD) V-band downpipe discharge, .64 A/R, w/ Internal Wastegate

The Borg Warner EFR 6258 turbo is the 2nd size (#2 of 7) turbocharger in the ultra-efficient, high performance EFR series. It uses the same 49.6mm inducer, 62mm exducer compressor wheel as the smaller 6255 but with a larger 58mm OD turbine wheel for a greater maximum yield of 400 HP. Comp. wheel flow rate of 44lb/min with very broad compressor MAP, resulting in outstanding power potential, even at high boost. Very quick spool makes it ideal for small engines in single turbo configuration or lager engines in twin form for up to 800 HP of flow. This is an excellent turbocharger for rally, drift, road racing, auto X alike.

BorgWarner EFR (Engineered For Racing) Series turbos are purpose built units for the performance market & meet the needs of the next generation turbo consumer. Revolutionarily from the ground up, each incorporates a long list of features never before seen in a single package. All old technology has been thrown away completely & the result is a whole new breed of turbo, packed full of cutting edge advancements. Great emphases has been put towards a more compact design, making each EFR the ideal choice for applications with limited space available. Outstanding ease of installation & budget friendly (thanks to their 'total package' platform) every EFR eliminates the need to purchase/fabricate/install a separate blow of valve & related flanges/tubing due to their already integrated BOV. The internally wastegated units present another large advantage in savings & install simplicity by eliminating the need for an external wastegate(s), related fab work & otherwise cumbersome materials.

Compressor Features
* Low inertia, Forged Billet Aluminum Compressor Wheel w/ Extended Tip Technology (ETT) provides the ultimate in response & extreme durability in high pressure applications.
* Speed sensor mounting provisions
* Built In BOV Included (All EFR compressor housings incorporate an integrated BOV)
* Boost Control Solenoid Included


Compressor Specs
* Compressor Wheel Inducer: 49.6mm
* Compressor Wheel Exducer (OD): 62mm
* Max Flow Rate: 44 lb/min
* Housing: 2.5" inlet, 2.0" hose coupler outlet.

Turbine Features
* Gamma-Ti turbine wheel cuts turbine inertia up to 50%, dramatically improving turbo response & permitting high rotational speeds.
* Solid Stainless Steel Investment Cast thin wall turbine housing for extreme durability, huge weight reductions & lowered thermal inertia. Very smooth internal channels promote peak flow.
* Adjustable Internal wastegate actuator Included (internal wastegated units only)
* Large internal wastegate ports handle the flow requirements of high performance engines. (internal wastegated units only)

Turbine Specs
* Turbine Wheel OD: 58mm
* Available Housing Option #1: T25 Inlet, 3" (92mm OD) V-band downpipe discharge, .64 A/R, w/ Internal Wastegate
* Available Housing Option #2: T4 Divided / Twin scroll Inlet, 3" (92mm OD) V-band downpipe discharge, .92 A/R w/ Internal Wastegate

Center Section
* Dual Row Ceramic Ball Bearing Design (extreme durability & the lowest friction / fastest spooling bearing design produced to date)
* Built-in -4 AN oil control orifice included (no restrictor needed)
* Water-cooled ( water-cooling is recommended but not mandatory)
* Double seals on both turbine and compressor end for extreme durability & resistance to oil seepage

Legal only for use in competition vehicles which may never be registered, licensed, and/or used on public streets or highways; and also for use in other exempted vehicles.