BD Turbos

In a turbocharged diesel engine, the turbo mechanically compresses outside air that comes in through the intake manifold into the combustion cylinders where fuel is also injected. Having a greater oxygen-to-fuel ratio means greater power and increased fuel efficiency. But a turbo doesn't create energy, rather it efficiently utilizes the power a truck already has by turning exhaust gasses into usable boost pressure.

A larger turbo can flow more air and create more boost pressure, but it is important to make sure your engine can handle the resulting increase in power. Modifications to your diesel should be balanced so you increase the efficiency, power, and longevity of your truck all at the same time. For example, if you purchase a larger turbo, you may want to consider getting a set of A1 Head Studs to protect your head gasket.

Unlike most manufacturers, when you purchase a BD Diesel turbo you can be confident that it will come with everything needed for installation--right down to the zip ties. BD turbo kits are designed with self-installing users in mind. If your truck requires a downpipe or an adapter, it will be in the kit. Turbo gaskets, oil drain gaskets, application specific clamps, pre-calibrated adjustable wastegate: It's all there, no need to go looking for matching parts.

PSI: Refers to the threshold pounds of pressure per square inch required to open the wastegate. If more exhaust flow is entering into your turbo then it can effectively convert into usable boost pressure, the excess pressure buildup will be safely released via the wastegate. Because BD Diesel turbos let air flow through more efficiently, they can utilize more exhaust pressure without needing to dangerously tighten the wastegate (which can lead to a variety of engine problems).

Turbine Wheel Size: Refers to the size of the propeller wheel that is driven by exhaust gasses exiting the engine cylinders. The spinning of the turbine wheel is what drives the spinning of the compressor wheel (see below), effectively powering the turbo. A larger turbine wheel provides more surface area for exhaust gasses to push against, allowing more pressure to flow through.

Compressor Wheel Size: Refers to the size of the propeller wheel that pulls in cool air and packs (compresses) it into the cylinders. Larger compressor wheels are able to efficiently pull in a greater volume of air--which means a greater volume of oxygen. The more oxygenated your fuel is, the more power and fuel efficiency you have.

A/R: Refers to the area/radius relationship of the turbo housing (the spiral pipe through which exhaust gasses flow into the turbo). A larger turbo with a larger A/R ratio will not spool quite as quickly, but will allow greater flow with RPM. The area (A) is essentially determined by the diameter of the turbine housing (which is wider where exhaust gasses enter and narrower where it releases the flow to the turbine wheel). A narrower housing increases the velocity of the exhaust gasses hitting the turbine wheel, but it also creates more resistance and back pressure. The radius (R) (which refers to the distance between the center of the turbine spiral and the center of the tube at any given point) indicates how "tight" the curvature of the spiral is. A tighter curve creates quicker drive but allows less flow.

CFM: Refers to the cubic feet of air the a turbo can flow in a minute. The more air a turbo can flow, the greater the amount of horsepower it can utilize from your exhaust to make your diesel more powerful and efficient.

If you currently own a BD Diesel Super B or Super B Special turbo for your Dodge and you want to upgrade to a twin turbo, you can simply purchase the upgrade kit (includes a second turbo and installation accessories). If you already have two turbos Super B or Super B Special turbos and you want to convert them into a twin turbo, get an installation kit.