A wastegate actuator spring upgrade. The higher upgrade stages from Nordic for cars equipped with a Garrett T25 turbo come with a stiffer wastegate actuator spring. The following is the procedure of the spring replacement. The actuator has to be removed from the car first (parts from Taliaferro Imports).

03.10.2005
Wastegate actuator

The actuator consists of a vacuum box and a rod that pulls the wastegate arm.
03.10.2005
Vacuum box

The spring is inside the vacuum box. The box is a round can with a rolled rim.
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Opening the can

Use your favourite tool to pry off the edge of the rim. Be careful not to bend it too much as the rim has to be rolled back in later.
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Almost there

Continue around the entire perimeter. Medium sized vice-grips work well.
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Pop

Sooner or later, the can pops open. The spring is not that strong, so don't worry about it shooting away and crashing your china.
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Apart

The wastegate actuator apart. You can see the can, the spring, the rod with a piston attached, and the rubber membrane.
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Wire brush

This might be a good time to clean the rust and dirt accumulated on the can.
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Membrane

Clean the membrane, inspect it for cracks and lubricate with your favourite rubber treatment for longevity.
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Springs

The spring supplied by Nordic is noticeably beefier.
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Clamped together

Put the actuator back together and clamp it. Make sure the edges of the membrane are evently centered around the rim.
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Rolling back

Roll the rim back in. Be careful not to crack the metal. I don't think it will withstand one more operation like this.
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Crimping

Press the edges tightly with vice-grips or another suitable tool. Check the box for vacuum leaks.
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Ready to paint

I decided to paint the actuator while I have it off the car. Don't forget to mask the inlet and the threads.
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Finished

Primed, painted and ready to go back on the car.

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