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Upgrading Your ISX Cummins Turbo: The Power Advantage

Posted by Will on May 23, 2025

Upgrading Your ISX Cummins Turbo: The Power Advantage

The Stock Turbo Problem

For diesel enthusiasts familiar with the ISX Cummins engine, one critical limitation stands out above all others: the severely undersized stock turbocharger. With a tiny 2.6-inch intake wheel diameter, the factory turbo is woefully inadequate for a massive 15-liter powerplant. To put this in perspective, this turbo is comparable to what you'd find on a 6.7L Ram pickup truck - already considered small for that application, let alone for an engine more than twice that size.

In the world of turbochargers, size truly matters. The stock ISX turbo simply cannot flow sufficient air to:

  • Optimize engine performance
  • Maximize fuel efficiency
  • Maintain proper operating temperatures
  • Ensure turbocharger longevity


Performance Implications

This undersized factory unit creates a cascade of performance issues:

  • Restricted Airflow: Limits maximum power output
  • Higher Operating Temperatures: Excessive heat reduces component lifespan
  • Reduced Fuel Economy: Poor airflow means inefficient combustion
  • Premature Failure: Operating beyond design parameters leads to early replacement
  • Replacement Cost: Factory turbos carry a substantial price tag


The Turbonator® Solution

Diesel Power Source offers a game-changing alternative for ISX owners - the only emissions-compatible upgrade kit that allows installation of an S400 VGT (Variable Geometry Turbocharger) on these engines.

The kit includes:

  • Turbonator® VGT turbo
  • High-flow T6 exhaust manifold
  • Complete installation components


Benefits of Upgrading

  • The Turbonator® VGT turbo transforms ISX performance with:
  • Significantly Improved Airflow: Delivers more oxygen for better combustion
  • Enhanced Fuel Economy: Better MPG through more efficient operation
  • Broader Power Band: Improved performance across the entire RPM range
  • Quick Spool-Up: Faster response when you need power
  • Retained Engine Brake Functionality: Maintains critical safety feature
  • Increased Durability: Built to handle the demands of a 15L engine

For serious diesel enthusiasts looking to maximize their ISX Cummins performance while maintaining emissions compliance, the Turbinator VGT turbo from Diesel Power Source represents the definitive solution to a fundamental design limitation.

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