Niles Nimmo

Welcome to the Holset Turbocharger Complete Model Guide, the reference PT Turbo built from more than 45 years of turning wrenches on diesel turbos. Holset (now owned by Cummins Turbo Technologies) has powered everything from light-duty Ram pickups to Class 8 over-the-road trucks and industrial gensets. If you run diesel, you have almost certainly relied

If you’ve spun a wrench on Japanese and European diesels, you already know the IHI turbocharger by feel. The RHF and RHB series bolt to everything from Subaru boxers to Isuzu 4-cylinder trucks, the VF series runs boost on Subaru WRX and STI platforms, and IHI’s marine turbos push commercial fishing boats and workboats hard

The IHI RHF5 turbocharger is one of the most common units a diesel tech will ever pull off a light commercial rig, and for good reason. It bolts up to millions of Isuzu 4JJ1, 4JH1, and 4HK1 engines, plus a long list of Mazda, Holden, and Subaru applications. If you turn wrenches on Isuzu D-MAX,

The BorgWarner K31 turbocharger is the backbone of boost on some of the hardest-working on-highway diesels in North America, and if you run Volvo D13 or Mack MP8 power, you’ve either replaced one or you’re about to. This unit lives under constant thermal and pressure load in Class 8 linehaul service, and when it starts

If you’re spec’ing a turbo for a diesel build or a fleet repower, the BorgWarner S300 vs S400 vs S480 question comes up on nearly every desk. These three frame sizes cover the vast majority of medium and heavy-duty diesel applications on the road today, from a 5.9L Cummins to a 15L Detroit, and picking

The BorgWarner S400 turbocharger is the workhorse behind more high-flow diesel builds than almost any other frame on the market. If you’re pushing a Cummins, Duramax, Powerstroke, or a Class 8 truck engine past its factory power ceiling, chances are an S400 is either already bolted on or on your short list. This is the

The BorgWarner S300 turbocharger is the workhorse of the medium and heavy-duty diesel world. If you’ve spun a wrench on a 5.9L Cummins, a CAT 3126, or a Detroit Series 60, you’ve had your hands on an S300 or one of its close cousins. This frame family has powered everything from farm tractors to over-the-road