14-07-2014, 10:59 AM
Sounds like it could be an incredible turbo.
Anyway if your using a GT15 boost actuator on the VNT mechanism instead of the original vacuum actuator you need to turn it round the other way as the vacuum actuator leaves the vanes open with no vacuum then pulls them closed with ECU fed vacuum whereas with a boost actuator you need to have them pulled closed with no boost and then pushed open when the actuator receives boost.
I set my turbo up using a length of hose to the actuator with a tyre valve glued into the other end and then connected a bicycle tyre pump with a good pressure gauge to it and used it to check the travel (see the below video).
Some people run a manual ball and spring boost controller in the line to the actuator so it doesn't start opening till a certain boost threshold as all the actuators I have tested start moving at about 5psi.
Anyway if your using a GT15 boost actuator on the VNT mechanism instead of the original vacuum actuator you need to turn it round the other way as the vacuum actuator leaves the vanes open with no vacuum then pulls them closed with ECU fed vacuum whereas with a boost actuator you need to have them pulled closed with no boost and then pushed open when the actuator receives boost.
I set my turbo up using a length of hose to the actuator with a tyre valve glued into the other end and then connected a bicycle tyre pump with a good pressure gauge to it and used it to check the travel (see the below video).
Some people run a manual ball and spring boost controller in the line to the actuator so it doesn't start opening till a certain boost threshold as all the actuators I have tested start moving at about 5psi.