US Perfect Auto Parts & Supplies Inc.
Detroit Series 60 12.7L turbo S400 171701 front view

S400 171701 23518588 Turbocharger for Detroit Series 60 12.7L

The S400 (171701) is a BorgWarner turbocharger for the Detroit Diesel Series 60 12.7L engine at 450-475 HP. This is a non-wastegated turbo with a T6 turbine inlet, 1.32 A/R twin-scroll turbine housing, and V-band 4.21” compressor outlet. It replaces the OEM Garrett TMF5502 that was originally equipped on the Series 60, with an upgraded 71mm compressor wheel. BorgWarner part 171701, Detroit OEM 23518588. Our S400 ships new with all new components, dynamically balanced, with gaskets. We supply shops, fleets, and distributors.

Turbo Model

S400 / S400S061 (BorgWarner, non-wastegated, T6 twin-scroll)

OEM / Interchange Numbers

  • 171701
  • 23518588
  • R23515635
  • R23515636
  • R23516431
  • 466713-0002
  • 466713-0003
  • 2585837C91

Application

Detroit Diesel Series 60 12.7L 450-475HP, also CAT C12; T6 twin-scroll 1.32 A/R, non-wastegated

Service & Support

  • 1-Year Unlimited-Mileage Warranty
  • US Stock, Fast Dispatch
  • Bulk Orders Welcome
  • White-Label Support
  • Fully Certified
Get a Quick Quote

Your Source for Quality Diesel Engine Parts

  • US stock fast dispatch icon
  • 100% brand new parts icon
  • 1-year warranty icon
  • Wholesale pricing icon
  • White-label support icon
  • Fully certified quality icon

FAQ

The S400 (171701) fits the Detroit Diesel Series 60 12-7L at 450-475HP, plus verified CAT C12 applications. OE and interchange numbers include 171701, 23518588, R23515635, R23515636, R23516431, 466713-0002, 466713-0003, 2585837C91. If your number is not listed, send it with the old part's dataplate photo and we confirm the match before shipping.

The 171702 (S400/S475) is the performance variant with a larger compressor wheel for 475+ HP applications. The 171701 is the standard 450-475 HP replacement.

Yes. The S400 (171701) is a direct bolt-on replacement for the OEM Garrett TMF5502 originally equipped on the Series 60, with an upgraded BorgWarner 71mm compressor wheel.

Brand new, 100% new components, dynamically balanced. No core charge. One-year unlimited-mileage warranty.

Yes. US stock, volume pricing for shops, fleets, and distributors.

S400 for Detroit Series 60: The 450-475 HP Standard Turbo

The BorgWarner S400 (171701) is the go-to turbo for higher-HP Detroit Series 60 12.7L engines. It replaced the original Garrett TMF5502 and brought an upgraded 71mm compressor wheel for better airflow and durability. The S400 is also widely used in turbo conversion kits for the Detroit 14L and in other heavy-duty applications.

Detroit Series 60 turbo lineup

TurboHP rangeKey part #
K31360-430 HP172253 / 172743
S400 (this page)450-475 HP171701
S400/S475475+ HP (performance)171702

Check your engine HP rating and serial number to determine which turbo you need.

S400 specifications

  • Turbine inlet: T6 flange, twin-scroll
  • Turbine housing A/R: 1.32
  • Turbine exhaust: 5.75”
  • Compressor outlet: V-band 4.21”
  • Compressor wheel inducer: 71mm

Common failure modes

  • Bearing wear — shaft play at 300k-500k miles. Oil leaks, rising EGT.
  • Turbine wheel erosion — long service hours at high EGT on the 12.7L.
  • Oil seal failure — restricted drain or high crankcase pressure.

Cross Reference Numbers

This turbocharger replaces the following OE and interchange numbers:

  • 171701
  • 23518588
  • R23515635
  • R23515636
  • R23516431
  • 466713-0002
  • 466713-0003
  • 2585837C91

Related configuration: K31 172253 for 360-430HP.

Installation and Care

  • Find out why the old turbo failed before installing the new one. Oil starvation or contaminated oil will destroy the replacement the same way.
  • Change the engine oil and filter. Flush or replace the oil feed line.
  • Replace the exhaust manifold and oil drain gaskets. Prime the turbo with clean oil before startup.
  • Verify the T6 flange and 1.32 A/R housing against the old unit before installation.

See our quality process for details.

Related Products