![]() ![]() The size of the turbine can be measured the same way, but the more important dimension of the exhaust side has to do with its flow. When someone asks “what size turbo does it have” this is the measurement they are after, and for a diesel pickup, usually its between 60 and 69mm for a stock to mildly modified engine. There are a few key dimensions used to classify all turbos, and usually the first is the diameter of the compressor inducer in millimeters. Exhaust enters the turbine housing and is directed into the turbine wheel where it spins the shaft and the compressor on the other end, where fresh air is pumped into the engine. This is the simplest design of turbocharger, and it has three major parts: a turbine housing, compressor housing, and the shaft with a compressor on one end and turbine wheel on the other. ![]() The trucks that came with a fixed vane or “traditional” turbocharger include the 1st, 2nd and 3rd gen Rams from 1989 to 2007, the 7.3 Powerstroke, and the LB7 Duramax. Most “basic” turbochargers are considered a fixed vane, and while they are still used today in the gasoline world, on the diesel side of things they’re nonexistent. For the last 15 years or so, diesel trucks have been coming from the factory with a Variable Geometry Turbocharger (VGT) and older trucks mostly came with a fixed vane charger, but to further complicate things, when picking an upgrade for your old or new pickup, both types are available for old and new rigs. All turbos can be broken down into two major subsets: fixed vane or a variable geometry. It can be a little difficult to choose which kind of turbo is best, so today we’re gonna take the mystery out of turbo selection and explain the pros and cons as well as the proper application of each type to hopefully make the decision a little easier. If you’ve ever looked into upgrading the turbo on your late model diesel, you’ve likely noticed how many options there are. ![]()
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