How to Choose the Right HX35 Turbo for Your Cummins Engine

Picking the right turbocharger for your Cummins engine boosts performance and reliability. The HX35 turbo is a favored choice for both 5.9 and 6.7 Cummins models. This article covers key details—from hx35 specs to comparisons with options like the stage 2 turbo 6.7 Cummins, and includes terms like spoologic turbo 5.9 Cummins and hx35 turbo cartridge to ensure a helpful, SEO-friendly guide.

Understanding the HX35 Turbo: A Brief Overview

The HX35 turbocharger, manufactured by Holset, is a popular upgrade for Cummins engines, especially the 5.9L and 6.7L models. Known for its durability and ability to handle higher boost pressures, the HX35 offers an excellent balance of spool time and top-end power.

HX35 specs include a compressor housing with a 57mm inducer, a turbine housing ranging from 0.63 to 0.70 A/R, and the ability to support power levels well beyond stock turbos. The HX35 is commonly upgraded with aftermarket components such as billet wheels and improved cartridges, enhancing performance and longevity.

Key Factors to Consider When Choosing an HX35 Turbo

1. Engine Size and Application

The first step is identifying your engine’s specifications and intended use. The spoologic turbo 5.9 Cummins setup is popular for daily drivers and moderate towing, providing a great balance between quick spool and power gains.

If you have a 6.7 Cummins engine and are looking for a more aggressive setup, you might consider a stage 2 turbo 6.7 Cummins kit that often includes an upgraded HX35 or similar turbo with enhanced flow capabilities. Knowing whether you want a daily driver, a towing rig, or a race-ready build will influence the HX35 turbo model and cartridge you choose.

2. HX35 Turbo Cartridge Selection

The turbo cartridge, also known as the CHRA (Center Housing Rotating Assembly), is the heart of the turbo. Upgrading the hx35 turbo cartridge can dramatically improve spool times, durability, and power handling.

Common cartridge upgrades include billet compressor wheels and improved thrust bearings. When selecting a cartridge, consider your boost targets and how aggressively you plan to tune your engine.

3. Turbo Size and A/R Ratio

Choosing the correct turbine housing size and A/R (area/radius) ratio directly affects spool and power characteristics. Smaller A/R ratios (like 0.63) provide faster spool but may limit top-end power, making them ideal for towing and daily use. Larger A/R ratios (like 0.70 or higher) support more top-end power at the expense of spool time.

Matching the HX35 specs to your power goals and driving style is crucial for a well-balanced setup.

4. Compatibility and Installation

Ensure the HX35 turbo you select is compatible with your Cummins engine year and model. Installation ease and availability of supporting hardware like exhaust manifolds and boost controllers also matter.

Some aftermarket turbo kits bundle the HX35 turbo with everything needed for a smooth swap, including gaskets, flanges, and hardware.

Also read: Duramax vs. Cummins

Comparing HX35 Turbo to Other Options

While the HX35 turbo is popular, other options like the stock turbo or larger models such as the HX40 exist. The HX35 sits nicely between stock turbochargers and larger turbos, making it a favorite upgrade for moderate to high horsepower builds.

For the 5.9 Cummins, the HX35 turbo offers a noticeable improvement over the stock Holset HE351 or HE352 turbos. Meanwhile, for the 6.7 Cummins, a stage 2 turbo 6.7 Cummins upgrade often features an HX35 or a similar-sized turbo tailored for better spool and higher boost.

Read more about: The Best 6.7 Cummins Upgrades

Benefits of Upgrading to an HX35 Turbo

  • Improved Power Output: The HX35 turbo can easily support power levels from 300 to 500 horsepower, depending on configuration.

  • Better Spool and Response: Compared to stock turbos, the HX35 offers faster spool, reducing turbo lag.

  • Durability: With quality cartridges and housings, the HX35 turbo is built to withstand high-boost conditions.

  • Versatility: Suitable for street, towing, and racing applications with the right setup.

Tips for Maintaining Your HX35 Turbo

Proper maintenance is vital to get the most out of your HX35 turbo:

  • Use high-quality synthetic oil and change it regularly.

  • Allow the turbo to cool down before shutting off your engine to prevent heat soak damage.

  • Regularly inspect the turbocharger for shaft play or unusual noises.

  • Consider installing a water-methanol injection system for additional cooling and power gains.

Frequently Asked Questions (FAQs)

Q1: Can I use an HX35 turbo on a stock 5.9 Cummins engine?
Yes, the HX35 turbo is a popular upgrade for stock 5.9 Cummins engines, providing better spool and power with proper tuning.

Q2: What’s the difference between HX35 and stage 2 turbo 6.7 Cummins kits?
HX35 turbo upgrades focus on improving spool and power on both 5.9 and 6.7 engines, while stage 2 kits for 6.7 Cummins typically include more comprehensive hardware and tuning for higher power levels.

Conclusion

Choosing the right HX35 turbo for your Cummins engine requires understanding your engine model, power goals, and application. Whether you’re upgrading your spoologic turbo 5.9 Cummins or building a stage 2 turbo 6.7 Cummins, knowing the hx35 specs and selecting the appropriate hx35 turbo cartridge will ensure optimal performance.

With the right HX35 turbo, you can achieve faster spool times, increased horsepower, and enhanced durability—making your Cummins engine stronger and more efficient on the road or worksite. Take time to research, consult with experts, and choose a turbo that matches your build perfectly.

Location: United States

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