W1/W2 CHRA Swap

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These instructions are for both a W1 and W2 turbochargers. The photographs are mostly of a W1 turbocharger. Photos of a W2 are provided when necessary for clarity

These instructions do not cover removal and reinstallation of the turbocharger

Ensure you have a clean work surface or lay down a clean cover to ensure nothing can make its way into your turbocharger

Set out your turbocharger on a workbench as shown

Turbine Housing

CHRA

Compressor COver

Using a 10mm socket remove the nut (red circle) holding the V-band clamp

Remove the clamp

The clamp should easily come off of the turbo once the nut is removed

Carefully pull the CHRA straight out of the turbine housing

There is a locating pin between the CHRA and turbine housing

The turbocharger may be stuck to the turbine housing. In this case you can tap the turbine housing lightly with a rubber mallet to break it loose

Snap Ring

Snap Ring Pliers

Use snap ring pliers to compress and lift the snap ring out of the groove in the compressor cover

Once the snap ring is free lift it straight up and remove it from the CHRA

You may need to rotate the snap ring around the CHRA to remove it more easily

If you do not have snap ring pliers, needle nose pliers will work but they are not recommended

Remove CHRA

The CHRA should now easily come straight out of the compressor cover

Sometimes the O-ring around the CHRA will stick a little. In this case wiggle the CHRA side to side while holding the compressor cover down being careful to not hit the inside of the cover with the compressor blades

When failure occurs in a turbocharger there is a chance the blades will make contact with the inside of the compressor cover

Small scratches or dings are fairly normal on used OEM and aftermarket housings and are not a point of concern

Visually inspect and feel the inside of the compressor cover to ensure there is no metal sticking up that could make contact with your new blades

If you feel any burrs these can be knocked down with a lighter grit sandpaper such as 500 or 600 grit

Be sure to clean your compressor cover, especially after sanding

Do not need to remove much material, just enough to knock down any burrs

Visually inspect the inside of the Turbine housing

Some small cracks in the turbine housing are not uncommon on OE and aftermarket turbos. Normally, this is not a performance issue

This is a good example of a small crack that wouldn't cause concern

If you notice anything concerning with your turbine housing then give us a call at 571-271-0271

The Turbine housing is far less likely to have suffered damage as it is made of steel rather than aluminum. This makes it much more laborious to repair

Prime the o-ring on the CHRA by dipping your finger in fresh engine oil and spreading a thin layer around the outide of the o-ring

Set the CHRA into the compressor cover ensuring the pin on the cover and the hole on the CHRA align

This is the only diference between a W1 and W2 CHRA installation, note the larger pin on the cover, and the divot on the CHRA

Using both hands press the CHRA into the cover. Ensure this goes in straight

You should be able to feel the CHRA seat into the Compressor cover

DO NOT press down on the turbine wheel itself, hold the CHRA by the body as shown

Make sure the compressor wheel goes in straight to ensure no contact is made with the Compressor cover

While holding the CHRA in the seated position compress the snap ring and set it into the groove in the compressor cover

Press the two end tabs into the groove with a flathead screw driver

Check the snap ring all the way around the CHRA to be sure it is seated correctly as shown

If you are unsure if the snap ring is seated correctly use your flat head screwdriver to press the snap ring down around the entire CHRA

Ensure the pin on the turbine housing and the hole on the CHRA align when you press them together

Insert the CHRA into the turbine housing

Be sure the turbine blades go into the housing straight and do not make contact with the housing

Wrap the V-band clamp around the CHRA and the turbine housing ensuring both flanges are caught by the clamp

Push on both sides of the turbo to push the two flanges together

Thread the 10mm nut onto the bolt then torque to 6 FT/LBS or 62 IN/LBS

The reassembled turbo should appear as shown

We do recommend blowing your turbocharger out with compressed air after assembly to ensure there is no foreign objects in the housings that could cause trouble down the line

W1 installation instructions

W2 Installation instructions

This completes the installation of your 27WON W1/W2 CHRA

We hope you were impressed with your 27WON experience and love your new CHRA for years to come. Email us at sales@27won.com or call us at 571-271-0271 with any questions or concerns