Product description
Replace the factory 1.15 a/r turbine housing on your 1994-1997 7.3L Power Stroke with this tighter .84 housing for quicker spool-up and increased boot pressure. The smaller .84 housing will improve drivability and effectively move your usable power band lower into the RPM range.The .84 is an excellent option for stock injector trucks.
BOR-170299 (or BorgWarner part number 170299) is a genuine OEM turbine housing (exhaust side) for the TP38 turbocharger series, originally designed for early Ford 7.3L Powerstroke diesel engines (1994-1997 non-obsessed models). This is a standalone replacement or upgrade housing, commonly used in stock rebuilds, performance swaps, or when swapping to aftermarket turbos on 7.3L Powerstroke trucks (e.g., for quicker spool or better flow with upgraded wheels/cores).
Key Features & Specifications
Model/Series: TP38 turbine housing (part of the early Garrett/BorgWarner TP38 turbo family for 7.3L IDI/Powerstroke).
A/R Ratio: Approximately 0.84 (tight/tight scroll for fast spool and strong low-end torque; often listed as .84 A/R, a popular upgrade over the stock ~1.15 A/R housing for quicker response and reduced lag in towing/street applications).
Inlet Configuration: T4 divided / twin scroll (twin volute for pulse separation; compatible with stock or aftermarket manifolds).
Outlet: V-band or Marmon-style (quick-release for easy install/sealing).
Material: High-temperature cast iron for durability under high EGTs in diesel use.
Turbine Wheel Compatibility: Designed for the stock TP38 turbine wheel (~70-74mm exducer typical in 7.3L setups); pairs well with upgraded billet wheels in performance builds.
Power Range: Supports stock ~215-275 hp levels reliably; with bigger injectors, tunes, and intercooler upgrades, enables 400-600+ hp in modified 7.3L builds (great for towing, daily driving, or mild performance without excessive lag).
Other Notes: Oil-cooled (no water lines); adjustable clocking in some setups; often sold as a direct replacement for worn or cracked stock housings.
Applications
Primary: 1994-1997 Ford F-Series Super Duty with 7.3L Powerstroke (direct fit or upgrade from larger A/R housings for better spool).
Secondary: Custom turbo builds/swaps on older Powerstroke, Cummins, or Duramax where TP38-style housings are adapted (e.g., budget billet turbo projects).
Popular for quick spool upgrades on 7.3L trucks��many owners swap to this .84 A/R housing to improve throttle response and reduce turbo lag compared to stock 1.15 A/R.
