Originally Posted by redturbomiata
advice on checking the cat? how do you adjust the wg that comes with the greddy kit. this is my first turbo car so im learning as im going.
Exhaust shops use a pressure probe to detect clogged cats. They either drill a small hole or tap into the O2 sensor port and idle the car. If the cat is clogged, the pressure will be high.
The Greddy wastegate is easy to adjust. I've seen some good pictures of this elsewhere on the forum. Suggest a search. Anyway, the steps are (make sure everything is COOL):
1. Remove the wire clip that secures the actuator rod end to the wastegate shaft.
2. Pull actuator rod end free from wastegate shaft.
3. Loosen lock nut so that the actuator rod end can be rotated on the threaded portion of the actuator rod. You'll need two wrenches to do this, moving against each other.
4. By rotating the actuator rod end, you can change the length of the overall acuator rod. Making the rod shorter will increase boost. Making the rod longer will decrease boost. It is usually adjusted to where the actuator rod just barely holds the wastegate closed at rest. Rotate the actuator rod end. DO NOT ROTATE THE ACTUATOR ROD.
5. Now, reassemble and drive. Reassembly is the reverse of the above.