Common Problems When Installing a Holset Hx35 Turbo on Your Ms3 and How to Fix Them

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The Holset HX35 turbo is a popular upgrade for the Mazda Speed 3 (MS3) enthusiasts looking to enhance performance. However, the installation process can present several challenges. Here, we will explore common problems encountered during the installation of the Holset HX35 turbo and provide solutions to ensure a smooth upgrade.

Common Installation Issues

  • Incompatible Oil Lines
  • Exhaust Manifold Fitment
  • Boost Control Issues
  • Intercooler Piping Alignment
  • Electrical Connections

Incompatible Oil Lines

One of the most frequent issues when installing a Holset HX35 turbo is dealing with incompatible oil lines. The stock oil feed and return lines may not fit the new turbo properly, leading to potential oil starvation or leaks.

Solution

To resolve this issue, consider the following:

  • Purchase a custom oil feed line that fits the HX35 turbo.
  • Ensure the return line has the correct diameter and length.
  • Use high-quality fittings to prevent leaks.

Exhaust Manifold Fitment

Another common problem is the fitment of the exhaust manifold. The HX35 may not align perfectly with the stock manifold, causing alignment issues and exhaust leaks.

Solution

To fix exhaust manifold fitment issues, follow these steps:

  • Check the alignment of the turbo with the exhaust manifold.
  • If necessary, use spacers to adjust the positioning.
  • Consider aftermarket manifolds designed for the HX35 if problems persist.

Boost Control Issues

Boost control can become problematic when upgrading to a Holset HX35 turbo. The stock wastegate may not provide adequate control, leading to overboost or underboost conditions.

Solution

To address boost control issues, consider the following options:

  • Install an external wastegate for better boost management.
  • Use a boost controller to fine-tune boost levels.
  • Ensure all vacuum lines are properly connected and leak-free.

Intercooler Piping Alignment

When upgrading to a Holset HX35 turbo, the intercooler piping may need adjustments. The new turbo can change the routing of the piping, causing misalignment.

Solution

To fix intercooler piping alignment issues, follow these steps:

  • Re-evaluate the routing of the intercooler piping.
  • Use silicone couplers for flexibility and fitment.
  • Consider custom piping if necessary to achieve proper alignment.

Electrical Connections

Electrical connections can also pose challenges during the installation of the Holset HX35 turbo. Issues may arise with the boost control solenoid or other electrical components.

Solution

To resolve electrical connection issues, consider the following:

  • Double-check all electrical connections for proper fit and functionality.
  • Inspect wiring for any signs of wear or damage.
  • Consult wiring diagrams to ensure correct connections.

Conclusion

Installing a Holset HX35 turbo on your Mazda Speed 3 can significantly enhance performance, but it is essential to be aware of common installation problems. By addressing issues such as incompatible oil lines, exhaust manifold fitment, boost control, intercooler piping alignment, and electrical connections, you can ensure a successful installation. With the right preparation and solutions, you can enjoy the benefits of your new turbo without the headaches of installation challenges.