Turbos - Turbo Accessories | 2020-2025 GM 6.6 Duramax L5P

The L5P Duramax is equipped with a Borg Warner turbo design known as Variable Vane Turbo, or VVT for short, that is very similar in design to what has been used since 2004.5 model years. Overall, little has changed in terms of turbo design between the previous LML engines and L5P with exception to an increase in allowable factory boost to 31 psi, revised VVT control strategy performed by the ECM to provide enhanced exhaust braking, and a new, dedicated turbocharger oil supply line that was not present on earlier models. Further, the standard ram air induction hood provides a noticeable increase in airflow to the engine, which assists in overall turbo performance.

Since the late 1990's, many diesel cars have been fitted with a Variable Geometry Turbo (VGT) or Variable Vane Turbo (VVT). These turbochargers are very effective in minimizing the effects of turbo lag, resulting in a more responsive throttle especially at low engine speed/RPM. These systems work by changing the speed and direction of the exhaust gases onto the turbine wheel. The most common of these systems is Garrett's VVT turbo, which incorporates a ring of small movable vanes around the turbine wheel. At slow engine speeds, the vanes are in the closed position, narrowing the gap between them which effectively accelerates the exhaust gas onto the turbine wheel. At high engine speed, the vanes open up slowing the exhaust gases, which stops the turbo from creating excessive boost.

While this type of turbo is astounding in itself, there are flaws. The biggest flaw, is that with any moving part in an exhaust system of a diesel, it can get clogged with soot, especially on higher horsepower applications. When the vanes do get clogged and are unable to clear themselves out, it requires disassembly of the turbo, and a thorough cleaning.

We offer direct replacement turbos from Garrett, Industrial Injection, and BD Power. For those looking for a more simplistic operating turbo for higher horsepower applications, we have kits to eliminate the variable vane technology in favor of a more simplistic S300 or S400 based charger. And for those wanting to do something even more extreme, we even offer TWIN TURBO kit which reuses the factory VGT turbo, creating uncompromised power!

As always, if you have any questions about which turbo is right for you and your truck, do not hesitate to give us a call or send an e-mail to [email protected] and we would be happy to assist.

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